Unmotivated - Fed Up Employees free essay sample

Fed Up: Reasons Why Employees Become Unmotivated There are sobering statistics out there about just how miserable people really feel in the workplace. We will write a custom essay sample on Unmotivated Fed Up Employees or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page With the economy the way it is today more and more people feel trapped with no way out. CareerBuilder. com says the #1 reason why people are unhappy or unmotivated in the workplace is their boss. That alone leads us to the # 1 reason why people quit their jobs: their boss. So in researching material for this essay I surveyed several managers within my company and asked them why they feel employees become unmotivated in the workplace.Do you know not a single one of them said management was the reason! That is hard to believe when it is the top reason as to why people leave or feel unmotivated in the workplace. So I then asked coworkers and here are the top three reasons as to why they feel people become unmotivated in the workplace. The individuals I spoke with felt the number one reason is indeed management. However, there are varying reasons as to why. Some feel as though they do not get enough recognition, lack of respect, and lastly unrealistic goals/expectations.In the world we live in today a lot more is expected out of an individual than ever before. Many companies know that with the state of the economy they have to better their selves for the future, but at what expense. Do they really have their employee’s best interests at heart? In most cases answer is yes. However, companies know that people are in an essence trapped so they can keep applying the pressure a little more, deadlines a little shorter, and recognition programs are usually the first to go in any budget cut situations. So people have to do more with a lot less.The second reason is lack of opportunities for advancement and or money. This goes hand in hand with the number one reason in that people are assuming more and more responsibilities, doing more work in shorter amount of time but usually at the same pay or less pay. Look at State Employees they have anywhere from 1-2 Furlough days a week, and they are still required to get there same work done in a shorter period of time. Some of them like Prison Guards, Fire Fighters etc. more work, shorter time period could potentially put them in some very dangerous situations.If companies are not hiring usually that means there isn’t any room to grow. Optimists would say at least individuals still have a job, and that is true but what is the cost. Won’t companies spend more time and money in the long run because if an individual is unhappy or unmotivated which means less productivity, which leads to low morale. It only takes one individual within a department to bring a whole department down. One department could lead to another and another etc. Then the third reason is unchallenged and just straight up bored.We are all human when we do things that are the same thing day in and day out it tends to get monotonous. Again in today’s economy more and more people are taking a job that is not necessarily what they seen their selves doing just to make ends meet. It could be very hard to be motivated to come to work every day if you are not doing something that you really enjoy doing. If you have a degree in Engineering and you are flipping Burgers it may be very difficult to be motivated because the job itself isn’t a challenge. Motivation is all about your attitude. So if you’re feeling unmotivated than you need to figure out why.Although, all of the reasons given are good ones, if you do not make the best out of your situation how will you succeed? Only you can change your circumstances, only you can be accountable for your situation. You can choose to be the â€Å"victim† or you can choose to be the â€Å"hero†. The â€Å"victim† takes the â€Å"poor, poor, pitiful me† attitude and the â€Å"hero† takes the â€Å"what can I do to make things better† attitude. Yes we are put in situations and jobs that may not be ideal but how you handle the situation is the key. So if you find yourself Fed Up than you to stop and ask yourself â€Å"what can I do to change my situation? †

Hero Essay on George Bush

Hero Essay on George Bush There are many people of the modern times that would fit the description of a hero. A hero is a person of distinguished courage or ability, admired for his/her brave deeds and noble qualities. One of my heroes of the 21st century is George W. Bush. Bush is the president of the United States and is doing what he thinks is right for our country. Some people do not like Bush because he went to war and they did not think he had to go to war. Bush is one of my heroes of the modern times.In classic literature heroes typically went through 4 stages in their journey. The first stage is when a hero or heroine leaves safe and familiar surroundings to search for a new understanding of life. George W. Bush left the familiar surroundings of a world without war to go to war. This was called on by the attack of the world trade centers and George Bush had to do something to counter this so other nations would not just do the same thing.In the book, Blair writes that he hoped that Georg...Going to wa r was an unknown land and Bush went here to show other nations that they would not attack us again. Bush searched for a new meaning of life and left a familiar surrounding and this is what makes him a hero.The second stage of being a hero or heroine is discovering the road that leads out of his secure homeland that has many obstacles, dangers, threats and struggles. Bush left the United States to go to Iraq, which is a unfamiliar place with many dangers and hardships. He did this knowing it was difficult but to make sure that the United States was secure in the future and protected. The result of what Bush did is worth...

Nutrition Discussion unit 1 Assignment Example | Topics and Well Written Essays - 250 words - 1

Nutrition Discussion unit 1 - Assignment Example One of the concepts that I have note been able to understand or which has put me in turmoil is the source of nutrients. Some professionals discuss the standards without providing distinguishing factors. For instance, the source of iron from fruits is better than from the meat. If the professionals are able to discuss the sources along with different sources and the factors that may take a different stance on the health then it will allow the general public to get a wholesome idea of the nutrient intake standards (Chaudhari, 2009). Secondly, the references that are furnished in the guides explaining the standards of nutrient intake seem to be illogical as they are not able to define the individual standards. This means that the standard may vary for person to person depending upon to the access to food selection and appointment in terms of lifestyle. Sources of nutrients can be attained by a person who has more time then those who remain busy. Chaudhari, R. (2009, August 13). Formulating Nutritional Shots. Retrieved from Food Product:

The book Marriage Morals by Bertrand Russell Essay

The book Marriage Morals by Bertrand Russell - Essay Example It contests and lobbies against LGBT rights, divorce, abortion, embryonic stem-cell study and pornography. Marriage and Morals is an old book written by philosopher Bertrand Russell, and that questions the Victorian perceptions of morality concerning marriage and sex (Russell 2). Contrast issues The Liberation of Women: chapter seven of the book advocates for women liberty; however, the approaches contrasts the morals the title claim. The chapter claims that the sex education provided by many books is insufficient to curb immorality. The only fixation that will suffice is to eliminate from young women all chances of being by themselves with men: girls must be prohibited to make their living by work outside the residence; they should never be permitted an outing unless in a company of their mother or an aunt; the unfortunate practice of going to boogies without a chaperon ought to be sternly stamped out. The book suggest that to avoid immorality of unmarried women there should be a mo nthly medical checkup carried out by police doctors and these doctors preferably castrated, and non-virgins to be sent to penitentiary(Russell 82). The chapter continue to suggest that the use of contraceptives and talking to unmarried women to be prohibited. The author asserts that if this is carried out for several years then the tide of immorality will be curbed. The concept is comparable with FRC effort to make women free from oppression; however, the approach differs. FRC has processes to encourage women freedom in a more humane manner as contrasted to suggestion that the book provides. It supports a federal ethics clause, permitting medical employees to refuse to give certain treatments to their clients, such as procurement of abortion, blood transfusion or birth control. It also supports for abstinence- and encourages sex education, intelligent design and entreaty in public schools, and the control of pornography and other "obscene, profane, indecent, or program on broadcast and cable television (Stange 510). In both cases, there is advocacy for restriction; however, the approaches differ. The book suggestions are not liberty related they are a different form of oppression of women in pretext of curbing immorality. The book gives a presumption that immorality can be controlled through restriction of women activities. Sex Morality: Chapter 8 of the book discuses the taboo on sex knowledge, it claims that frank pornography would do less damage if it were open and unashamed than it does when it is rendered interesting by secrecy and stealth(Russell 89). This is contrary to FRC stand on pornography since it is against it and advocates for the control of pornography and other indecent, obscene, profane, or program on broadcast and cable television. The book argues that the taboo against nudity is an obstruction to a decent approach on the topic of sex. It proposes that it is in order for children to observe each other and their parents nude when it so happen s naturally. There will be a short time, most likely at about three years of age, when the youngster is fascinated in the dissimilarity between the mother and the father, and compares them with the variances between themselves and other siblings, but this stage is soon ended, and subsequent to this they take no more interest in nakedness than in clothes. This is a contrasting fact with FRC stands that condemns any form of obscenity (Stange 510). The book considered homosexuality to be immoral when it

CH Energy Main Competitor Research Paper Example | Topics and Well Written Essays - 10000 words

CH Energy Main Competitor - Research Paper Example CH energy operates mainly in the United States of America which is the world's largest economy with an approximate per-capita GDP of about $46,900. It is also militarily and technologically the most powerful nation in the world. It is a purely market-oriented economy with most of the important strategic business decisions taken by individuals or the board of companies. The government buys goods and services from the private sector. The problems in this economy are inadequate investments towards economic infrastructures, a very high medical cost, trade and budget deficits apart from income stagnation in the economic groups with lower income. The GDP with regards to the purchasing power parity is about $ 14.26 trillion as of 2008. The GDP as per real growth rate is 1.1% as of 2008. The per capita GDP is about $ 46,900 as of 2008. In the total figure of GDP agriculture contributes about 1.2%, the industry contributes 19.2% and the services sector contributes about 79.6% towards the GDP. All this implies a rosy scenario for CH energy as the figures show that the country is predominately industry based which would result in a huge demand for power and related services. The country also offers a 154.3 million strong workforce. The country has a public debt of about 60.8% of the GDP as of 2007. The central bank discount rate is 0.5% as of 2009. The USA has a $1,624 trillion stock of money. The country has a wide range of industries ranging from consumer goods, aerospace, motor vehicles, steel, telecommunications, food processing, petroleum, and other industries. The country produces 4167 trillion kWh units of electricity and consumes about 3892 trillion kWh of power annually as of 2007. The USA exports about 20.14 billion units of electricity and imports only 51.4 billion kWh units of electricity.

Short Duration Voltage Variations Engineering Essay

Short Duration Voltage Variations Engineering Essay For long time, the main concern of consumers in power system was the reliability of supply which means that the continuity of electricity. However, it is not only the reliability that consumers want these days, quality of electricity supply is also very important for consumers. The term, electric power quality, broadly refers to maintaining a nearly sinusoidal bus voltage at specified magnitude and frequency in an uninterrupted manner from the reliability point of view. For a well-designed generating plant, which generates voltages almost perfectly sinusoidal at rated magnitude and frequency, power quality problems start with transmission system and stay applicable until end users in distribution system. The power quality in power system are categorized as temporary phenomena and steady state phenomena The power qualities are characterized in the power system by different terms suggested by Padiyar, K.R.,(2007) under these two categorizes are summarized as follows: 1.2. TEMPORARY PHENOMENA Transients: Transients are short-duration, high-amplitude pulses superimposed on a normal voltage waveform. They can vary widely from twice the normal voltage to several thousand volts and last from less than a microsecond up to a few hundredths of a second. Transients can be classified as impulsive transients and oscillatory transients. Impulse transients are mainly caused by the impact of lightning strikes to the power system. The typical causes of oscillatory transients are capacitor or transformer energization and converter switching. While impulsive transient is a sudden and has non-power frequency change in voltage and current with a fast rise and decaying time, oscillatory transient has one or more sinusoidal components with frequencies in the range from power frequency (50Hz) to 500 kHz and decays in time. Short Duration Voltage Variations: Short Duration Voltage Variations are defined as the variations in the supply voltage for durations not exceeding one minute and caused by faults, energization of large loads that having large inrush currents or rapidly varying large reactive power demands of the loads. These are further classified as voltage sags, voltage swells and interruption. Long Duration Voltage Variations: Long Duration Voltage Variations are defined as the rms variations in the supply voltage at fundamental frequency for exceeding one minute, such as overvoltage, under voltage and sustained interruption. The causes of overvoltage (or under voltage) may be the switching off (or on) of a large load having poor power factor, or the energization of a large capacitor bank or reactors. Voltage Unbalance: Voltage Unbalance is the condition in which three phase voltages of the supply are not equal in magnitude and may not be equally displaced in time. The primary causes are the single phase loads, open circuit in any one phase of a balanced 3phase loads and unequal loads connected in each phase of a poly phase systems. Waveform Distortion: Waveform Distortion is defined as steady-state deviation in the voltage or current waveform from an ideal sine wave. These distortions are classified as dc-offset, harmonics and notching. The causes of dc offsets in power systems are geomagnetic disturbances, especially at higher altitudes and half-wave rectifications. These may increase the peak value of the flux in the transformer, pushing it into saturation and resulting in heating in the transformer. Power electronics equipments like UPS, adjustable speed drives injects harmonics in the power systems. Notching is a periodic voltage distortion due to the operation of power converters when current commutates from one phase to another. Voltage Fluctuations: Voltage Fluctuations are defined as the rapid, systematic and random variations in the supply voltage. This is also called as Voltage Flicker and is caused by rapid and large variations in current magnitude of loads having poor power factor such as arc furnaces. These large variations in load current causes severe dip in the supply voltage unless the supply bus is very stiff. Power Frequency Variations: Power Frequency Variations are the variations that are caused by rapid changes in the load connected to the system, such as the operation of draglines connected to a comparatively low inertia system. Since the frequency is directly related to rotational speeds of the generators, large variations in power frequency may reduce the life span of turbine blades on the shaft connected to the generator. Although these above terms are not new, customer awareness on power quality has increased. In recent times, power quality issues and custom solutions have generated tremendous amount of interest among power system authorities and engineers. International Electro technical Commission (IEC) and Institute of Electrical and Electronics Engineers (IEEE) have proposed various standards on power quality. This led to more stringent regulations and limits imposed by electricity authorities although they differ from one country to another in a limited extend. Although terms of power quality are valid for transmission and distribution systems, their approach to power quality has different concerns. An engineer of transmission system deals with the control of active and reactive power flow in order to maximize both the loading capability and stability limits of the transmission system. On the other hand, an engineer of distribution system deals with load compensation either by means of individua l or group compensation in order to maintain power quality for each load in the distribution system (Sankaran.C, 2002, John J.Paserba et al, 2000). The utilization of power electronic based power conditioning devices brought the solution for these power quality issues in distribution system. 1.2 FACTS CONTROLLERS In recent years, many multinational software companies and automobile industries established their units in India. In turn, it initiates many other small industries to supply their needs. The growth of these industries is found to be very fast and it pollutes the power system by injecting harmonics into it. These industries need electrical power for its operation. Establishing new power generation unit is not so easy in India due to the initial cost. In addition it has many constraints like fuel constraints, political constraints, economical constraints and technological constraints. This makes to think an alternate solution for the scarcity of power by improving the quality of existing power. Reducing the wastages and improving the quality of available power is equivalent to generation of power. To improve the reliability and deliver energy at the lowest possible cost with improved power quality, power supply industries require increased flexibility in the transmission and in the di stribution systems. The power industries are handling these challenges with the power electronics based technology of Flexible AC Transmission systems (FACTS). This term covers the whole family of power electronic controllers, some of which may have achieved maturity within the industries, while some others are yet in the design stage. As Higorani et al (1999) described the various VSC based FACTS controllers are available for power quality improvement. FACTs has been defined by the IEEE as follows. Power electronics based system and other static equipment that provide control of one or more AC transmission system parameters to enhance controllability and increase power transfer capability. In general, FACTs controllers can be classified as follows Series Controllers Shunt Controllers Combined series and shunt Controllers Combined shunt and series Controllers Based on the power electronic devices used in the controller, the FACTS controllers can be classified as: (A) Variable impedance type FACTS Controller (B) Voltage Source Converter (VSC) based FACTS Controller The variable impedance type controllers include: (i) Shunt connected- Static Var Compensator (SVC) (ii) Series Connected-Thyristors Controlled Series Capacitor or Compensator (TCSC) (iii) Combined shunt and series connected Thyristors Controlled Phase Shifting Transformer (TCPST) of Static PST The VSC based FACTS controllers are: (i) Static synchronous Compensator (STATCOM) (shunt connected) (ii) Static Synchronous Series Compensator (SSSC) (series connected) (iii) Interline Power Flow Controller (IPFC) (combined series-series) (iv) Unified Power Flow Controller (UPFC) (combined shunt-series) The VSC based FACTS controllers have several advantages over the variable impedance type. VSC based STATCOM response is much faster than a variable impedance type SVC. STATCOM requires less space than SVC for same rating. It can supply required reactive power even at low values of the bus voltage. In addition, a STATCOM can supply active power if it has an energy source or large energy storage at its DC terminals. It can also be designed to have in built, short-term overload capability. The only drawback with VSC based controllers is that it requires use of self-commutating power semiconductor switches such as Gate Turn-off (GTO) thyristors, Insulated Gate Bipolar Transistors (IGBT), Integrated Gate Commutated Thyristors (IGCT). However, the VSC based controllers build with emerging power semiconductor devices using silicon carbide technology will lead to the wide spread use of VSC based controllers in future. Among FACTs controllers, the shunt controllers have shown feasibility in terms of cost effectiveness in a wide range of problem solving from transmission to distribution levels. For more than a decade, it has been recognized that the transmittable power through transmission lines could be increased and the voltage profile along the transmission line could be controlled by an appropriate amount of compensated reactive power. Moreover, the shunt controller can improve transient stability and can damp power oscillation during a post-fault event. Using a high speed power converter, the shunt controller can further alleviate the flicker problem caused by electrical arc furnaces. .1 SERIES CONTROLLERS Static synchronous series compensator (SSSC) is series reactive power compensation devices used in transmission level. The series compensation is obtained by controlling the equivalent impedance of a transmission line, to regulate the power flow through the line. The SSSC can be considered as a static synchronous generator that acts as a series compensator whose output voltage is fully controllable, independent of line current and kept in quadrature with it, with the aim of increasing or decreasing the voltage drop across the line, thus controlling the power flow. The basic structure of a SSSC connected with the network is shown in Figure 1.1. Line C VSC TF Figure.1.1 Series Connected SSSC The SSSC injects a voltage Vq in quadrature with line current. It can provide either capacitive compensation if Vq leads the line current by à Ã¢â€š ¬/2 rad or inductive compensation if Vq lags line current by à Ã¢â€š ¬/2 rad. A relatively small active power exchange is required to compensate for coupling transformer and switching losses, and maintain the required DC voltage. 1.2.2 SHUNT CONTROLLERS STATCOM The schematic diagram of a STATCOM is shown in Figure.1.2. In principle, all shunt type controllers inject additional current into the system at the point of common coupling (PCC). VSC that uses charged capacitors as the input dc source and produces a 3à Ã¢â‚¬ ¢ ac voltage output in synchronism and in phase with the ac systems. The converter is connected in shunt to a bus by means of the impedance of a coupling transformer. A control on the output voltage of this converter is either lower or higher than the connecting bus voltage, controls the reactive power drawn from or supplied to the connected bus. The impedance of the shunt controller, which is connected to the line causes a variable current to flow and hence represents an injection of current into the line. As long as the injected current is in phase quadrature with the line voltage, the shunt controller can either supply or consume variable reactive power. Line C VSC TF Figure.1.2 Shunt Connected STATCOM A six pulse Voltage Source Converter (VSC) with suitable controller, the phase angle and the magnitude of the AC voltage injected by the VSC can be controlled. The Phase Lock Loop (PLL) ensures that the sinusoidal component of the injected voltage is synchronized (matching in frequency and required phase angle) with the AC bus voltage to which VSC is connected through a coupling inductor. Often, the leakage impedance of the interconnecting transformer serves as the coupling inductor. It also serves as harmonic filter for the voltage injected by the VSC. The injection of harmonic voltages can also be minimized by multi-pulse (12, 24 or 48), and/or multilevel convertors. At low power levels, the pulse width modulation (PWM) technique is sufficient to control the magnitude of the fundamental component of the injected voltage. The high voltage IGBT devices can be switched at high frequency (2 kHz and above) of sinusoidal modulation enables the use of simple LC-low pass filters to reduce harmonic components. 1.2.3 COMBINED SHUNT AND SERIES CONTROLLERS (a). Unified Power Flow Controller (UPFC): The Unified Power Flow Controller (UPFC) is the most versatile FACTS controller for the regulation of voltage and power flow in a transmission line. It consists of two-voltage source converters (VSC) in which one connected in shunt and the other one connected in series. The DC capacitors of the two converters are connected as shown in Figure.1.3. the shunt connected converters work as STATCOM and controls the reactive current injected in to the line. Series connected converter work as SSSC and control reactive voltage injected series with the line. The combination of these two converters enables to exchange active power flow between the two converters. The series connected converter can supply or absorb the active power. VSC Line VSC C STATCOM SSSC Figure 1.3 Schematic of UPFC The controllable power source on the DC side of the series connected converter, results in the control of both real and reactive power flow in the line at the receiving end of the line. The shunt-connected converter provides the required reactive power and injects the reactive current at the converter bus. Thus, a UPFC has 3 degrees of freedom whereas other FACTS controllers have only one degree of freedom or control variable. The concept of combining two or more converters can be extended to provide flexibility and additional degrees of freedom. A Generalized UPFC refers to the use of three or more converters out of which one shunt connected while the remaining converters are series connected (b). Interline Power Flow Controller (IPFC): An Interline Power Flow Controller (IPFC) refers to the configuration of two or more series connected voltage source converters sharing a common DC bus as shown in Figure 1.4. The Interline Power Flow Controller (IPFC) is used reactive (series) compensation of each individual line. In addition to this, the IPFC is capable of exchanging real power between the two or more compensated lines. To achieve this AC side of the series connected VSCs are connected in different lines and on the DC side, all the DC capacitors of individual converters are connected in parallel. This is possible because all the series converters are located inside the substation in close proximity. VSC1 Line-1 VSC2 C SSSC1 SSSC-2 Line-2 Figure 1.4 Schematic of IPFC for two transmission line using two VSC An IPFC is similar to a UPFC in that the magnitude and phase angle of the injected voltage in the line (main system) can be controlled by exchanging real power with the second line (support system) in which a series converter is connected. The basic difference with a UPFC is that the support system in the UPFC is the shunt converter instead of a series converter. The series converter associated with the main system of one IPFC is termed as the master converter while the series converter associated with the support system is termed as the slave converter. The master converter controls both active and reactive voltage within limits while the slave converter controls the DC voltage across the capacitor and the reactive voltage magnitude. 1.3 APPLICATION FACTS CONTROLLERS IN DISTRIBUTION SYSTEMS Although the concept of FACTS was developed originally for transmission network, later on this has been extended since last decade for improvement of Power Quality (PQ) in distribution systems operating at low or medium voltages. In the early days, the power quality referred primarily to the uninterrupted power supply at acceptable voltage and frequency. In the modern context, power quality problem is defined as any problem manifested in voltage, current or frequency deviations that result in failure or malfunctioning of customer equipment. However, the increase in the use of computers, microprocessors and power electronic systems has resulted in power quality issues involving transient disturbances in voltage magnitude, waveform and frequency. The nonlinear loads not only cause power quality (PQ) problems but also very sensitive to the voltage deviations. The unbalanced load in the distribution system like single-phase railway loading creates power quality problem at the distributio n level. The highly inductive load like arc furnace is a major source of creating power quality problems in distribution network. Hingorani et al (1999), was the first to propose FACTS controllers for improving power quality in distribution systems. They have called it as Custom Power Devices. These are based on VSC with appropriate controller. Based on the types of connection with the distribution network the custom power devices classifications are given below; 1. Series connected Dynamic Voltage Restorer (DVR) 2. Shunt connected Distribution STATCOM (DSTATCOM) 3. Combined shunt and series connected Unified Power Quality Conditioner (UPQC). The Dynamic Voltage Restorer (DVR) is a series connected custom power device in the distribution systems. The DVR is analogous to a SSSC in the transmission system. The main function of a DVR is to reduce voltage sags seen by sensitive loads such as semiconductor manufacturing plant or a paper mill. They have been designed to compensate three phase voltage sags up to 35% for duration of time less than half a second (depending on the requirement). If the voltage sag occurs only in one phase as in the case of Single Line to Ground (SLG) faults then the DVR may be designed to provide compensation for sags exceeding 50%. The capacitor is designed to store energy in the range of 0.2 to 0.4 MJ per MW of load served. A DVR is connected in series with the distribution feeder through a transformer. The low voltage winding of the transformer is connected to the converter. If a DVR is used mainly to regulate the voltage at the load bus, it injects a series voltage of the required magnitude if i t detects a voltage sag else remains in stand-by mode during which the converter is bypassed or it is not injecting voltage. It is necessary to protect the DVR against the fault currents as in the case of a SSSC. A DVR with IGBT/IGCT devices can be controlled to act as a series active filter to reduce the voltage harmonics on the source side. It is also possible to balance the voltage on the load side by injecting negative and/or zero sequence voltages in addition to harmonic voltages. The distribution STATCOM (DSTATCOM) is similar to a STATCOM in transmission system that it uses a VSC of the required rating. However, the VSC used in a DSTATCOM is a 6-pulse converter with SPWM or Space Vector Modulated PWM (SVPWM) control over the magnitude of the injected AC voltage while maintaining a constant DC voltage across the capacitor. In DSTATCOM, faster power semiconductor devices such as IGBT or IGCT are used instead of GTO as in STATCOM. The rapid switching capability provided by IGBT (or IGCT) switches enables the use of DSTATCOM for balancing, active filtering and flicker mitigation. The unbalanced system is balanced by injecting negative sequence current to the system. The active filtering is done by injecting harmonic currents in the system. A DSTATCOM can be viewed as a controlled variable current source. If more power that is reactive is required for compensation in distribution system, dynamic capacitor rating is increased. To increase the dynamic rating in the capacitive range, a fixed capacitor can be connected in parallel with DSTATCOM. By connecting energy storage device such as a Superconducting Magnetic Energy Storage (SMES) or a battery charged by a separate charging system on the DC side, it is possible to exchange real power with the network for momentary interruptions or large voltage sags for a limited time. The combination of shunt and series active filters which are connected on the common DC side as shown in Figure.1.5 used as Unified Power Quality Conditioner. This configuration is inspired by the UPFC in the transmission system. Akagi.H (1996), suggest the possibility of a centralized UPQC at the distribution substation that will provide harmonic isolation between the sub-transmission system and distribution system. The series branch of UPQC provides this harmonic isolation in addition to voltage regulation and imbalance compensation. The shunt branch provides for harmonic and negative sequence current compensation in addition to DC link voltage regulation. A UPQC can be considered as the combination of DSTATCOM and DVR. A DSTATCOM is utilized to eliminate the harmonics from the source currents and balance them in addition to providing reactive power compensation to improve power factor or regulate the load bus voltage (Padiyar.K.R. 2007). DVR DSTATCOM Load VSC1 Line VSC2 C Vs PCC I_AF VL +VAF Figure 1.5 Schematic of a Unified Power Quality Controller (UPQC) The terminology is yet to be standardized. The term `active filters or `power conditioners is also employed to describe the custom power devices. Irrespective of the name, the trend is to increasingly apply VSC based compensators for power quality improvement. LITERATURE REVIEW Development of gate turn off capability of semiconductor switches opened a way to second-generation FACTs controller using voltage source converter (VSC). This VSC can be operated at high switching frequency to provide a faster response. The STATCOM is a shunt connected power converter based compensating device. Van Zyl. A, et.al proposed an idea for Converter based solution to power quality problems on radial distribution lines (1996). This is a first power converter based shunt compensator. The concept of STATCOM was disclosed by Gyuayi,.L (1988). The concept gives the characteristics of VSC that are suitable for grid connected FACTS controller application. In the older version of reactive power compensation device, the reactive power is drawn from energy storage devices such as capacitor in the case of Static Var Compensator (SVC), but in STATCOM power is circulated within the connected network. The energy storage components used in the STATCOM is much smaller in capacity than tho se used in the SVC. In 1995, the first +100MVA STATCOM was installed at the Sullivan substation of Tennessee Valley Authority (TVA) in northeastern Tennessee. This device is mainly used to regulate 161kV bus during the daily load variation to reduce the operation of the tap changer of a 1.2GVA 161kV/500kV transformer. The VSC used in this STATCOM is made up of eight two level VSC resulting a 48 pulse VSC. The output of each VSC is integrated by a complex interface zigzag connected interfacing transformers, because this is a two-level VSC, a series connection of five of gate-turn-off (GTO) thyristor is used as a main switch. The staircase type switching scheme at fundamental frequency (60Hz) was used as a control scheme for this STATCOM. Due to slow switching speed of the GTOs; the firing angles of the output wave form are fixed. Therefore, the amplitude of each output waveform is controlled by exchanging real power of the DC-link capacitor with the power grid. The power quality problem at distribution level like voltage regulation, harmonics reduction, power factor correction, reactive power compensation and unbalance compensations need to be carried out at distribution level. The DSTATCOM, connected to the grid through the coupling inductor at the point of common coupling (PCC) is controlled in such a way that it exchanges only reactive power with the grid. This is achieved by injecting current in quadrature with the grid voltage. The DSTATCOM is developed from the STATCOM used in transmission system for voltage regulation. Hingorani, N.G,. et al (1999) explored the concept and technology of Flexible AC Transmission Systems. The detailed modeling and average modeling of DSTATCOM and its performance for voltage regulation application is studied by Pierre Giroux et al (2000). This gives the concept of PWM controlled DSTATCOM in dq coordinate system. Sen Sarma. P.S., et al (2001) Analyzed and evaluated the performance of a distribution STATCOM for compensating voltage Fluctuations. Sao, C.K et al (2002) proposed the application of DSTATCOM from voltage regulation to reactive power compensation, power factor correction, mitigation of voltage sag and swell in distribution system and created a benchmark system to test all these performance. This DSTATCOM is controlled by PI controller in dq coordinate using parks transformation matrix. This work reduced the computation time of the controller by avoiding Inverse Parks transformation. The application of DSTATCOM is extended to compensate the reactive power for isolated induction generator by Bhim Singh et al (2003). This gave the mathematical modeling of induction generator and DSTATCOM. As the DSTATCOM is suitable for distribution system and stand alone system researcher focused to increase the performance of the controller. The concept of using DSTATCOM as a shunt active filter to reduce the current harmonics in the industrial application and gradually extended to power systems application by Georges, S. et al (2006) and Kannan, H.Y. et al (2008). The concept of Generalized Instantaneous Reactive Power Theory for Three-phase Power Systems is exploited by Akagi, P., et al (1984) and Fang Z heng Peng et al (1996). The concept of instantaneous reactive and real power is brought by them in to the design of controller for closed loop operation of VSC. A Survey of Current Control Techniques for Three-Phase Voltage-Source PWM Converters is brought by Marian P., et al (1998). These current control techniques provided a path way for direct control of VSC output current. Design and Implementation of DSTATCOM for fast load compensation of unbalanced loads was implemented by Wei-Neng Chang et al (2009). The controller for unbalanced system was built by phase sequence method and pulses are generated by current regulated PWM method. The Space Vector Modulation (SVM) PWM technique was an emerging control technique used in Voltage Source Converter (VSC) for controlling its output voltage by Atif Iqbal et al (2010). A New Vector-Based Hysteresis Current Control Scheme for Three-Phase PWM Voltage-Source Inverters was developed by Mansour Mohseni et al (2010). This thesis tries to appl y Vector-Based Hysteresis Current Control Scheme for DSTATCOM for power factor improvement. This research is focusing to use the SVM based PWM technique for DSTATCOM operation in addition to PI controlled SPWM in dq coordinate systems. This also extends the application SVM based HCC from inverter to DSTATCOM. 1.5 PROBLEM STATEMENT The voltage at distribution systems need to be maintained at 1pu at all conditions. The reactive power control plays an important role in maintaining the bus voltage at 1pu in the distribution bus.Classical reactive power controllers like fixed capacitors, switched capacitors, TCR, SVC etc have slow response and bulky. A DSTATCOM, though a costlier device it has faster response. Hence it is preferred when faster correction of voltages is required. It is required to design specific controllers for voltage regulation, power factor correction and unbalanced system compensations. All the above problems can be solved by installing a DSTATCOM with proper controllers. 1.6 OBJECTIVES The main aim of this thesis is to design and implement the controller for DSTATCOM to improve the power quality namely voltage regulation, voltage sag or swell, reactive power compensation, power factor improvement and unbalance compensation. The controllers presented in this work will aid the design engineers to develop an integrated controller with multiple control objectives. The main objectives of this thesis include To study the concepts of DSTATCOM and bring out the design procedure of it. To understand the controller principle for various applications and explore it for novel controller design. To design the new control algorithm namely PI controlled Space Vector Pulse Width modulation method and Study the performance of DSTATCOM for this controller to improve the power quality issues such as voltage regulation, power factor improvement and reactive power compensation. To compare this SVPWM controller performance with the performance of existing Sine Pulse Width Modulation (SPWM) method. To modify the basic SVPWM method so as to extend its controller to directly control the flow of current of DSTATCOM. This method of controller is called SVPWM based Hysteris Current Controller (HCC) method. To suggest a new control techniques for unbalanced system compensations using sequence analyzing method and validate its performance for power quality improve improvement. To explore the design of DSTATCOM components. To identify the controller for compensating balanced and unbalanced systems. 1.7 THESIS ORGANISATION This thesis contains seven chapters summarized as follows: In Chapter 1 need for improving the quality of power is discussed the power quality issues and various Flexible AC Transmission System (FACTS) controllers available for the power quality improvements in the transmission systems and distribution systems. This chapter also includes the review of the literature, outlines the research objectives and the organization of the thesis. Chapter 2 describes the general method for designing a DSTATCOM for power quality improvement. The DSTATCOM consists of a DC capacitor, a VSC, a coupling inductor and the controller. This chapter gives a method of designing the coupling inductor, the DC capacitor and selecting the power electronic switches for the VSC. It also focuses on analyzing the controllers of DSTATCOM for power quality improvements. In Chapter 3, the mathematical modeling of a two-level VSC based DSTATCOM is described. This Chapter also presents the PI controlled Sine Pulse Width Modulation (SPWM) and Space Vector PWM (SVPWM) switching techniques for voltage regulation applications. The comparative performance of these switching techniques is carried out. The control logic is developed from the power invariant property of the Parks transformation of

Merchant Of Venice Character Diary - Shylock :: Free Merchant of Venice Essays

Today Bassanio came up to me asking for my moneys. Later on I told him that I would lend him the moneys without any interest. I was very cautious in the repeating of his demands. Antonio is naive risking his life hoping the ships will return. I am clever because I am using this opportunity to get revenge. I made Bassanio nervous when I called Antonio a good man and they both probably knew the meaning. I'll show Antonio when his ships fail to return. Lancelot is getting on my nerves again. He is snail-slow in profit and he sleeps by day. My daughter seems to want to get out of the house and might be getting annoyed with me. I am sure that it is just a phase. Because it meant that Bassanio would lose even more of the money he borrowed I decided to attend the feast with all those creepy masks. I took no pleasure in it but I intend to ruin Bassanio. Bassanio will have all the ducats spent in no time. I forgot about my anger over my daughter's flight when I heard about Bassanio's ship wrecked in the English Channel. I then quickly remembered my daughters leaving when Tubal came to me with information on Jessica's reckless spending of my moneys. My heart was broken when I heard about I exchange for a monkey, she traded the ring that was a gift from my wife to me. I should have seen this coming. My hate turned into a disaster in only a short time today. First, Bassanio offered me double the money that was borrowed, but I was too stubborn to accept and reminded the court that the flesh was mine by law. I looked into Antonio's eyes and he seemed to have felt that he deserved what should have come. As I was sharpening my knife, Gratiano started abusing me. I guess I deserved what was happening but what happened next I'm not sure of. A lawyer came in and seemed to be on my side until she mentioned that I could only take Antonio's flesh, no blood. I was shocked to hear this but I then tried to accept the double amount but knew it was too late because that wasn't written on the bond. If that was not enough I could not just go home. The lawyer bent the law and would have taken away my life if it weren’t up to the Duke. Merchant Of Venice Character Diary - Shylock :: Free Merchant of Venice Essays Today Bassanio came up to me asking for my moneys. Later on I told him that I would lend him the moneys without any interest. I was very cautious in the repeating of his demands. Antonio is naive risking his life hoping the ships will return. I am clever because I am using this opportunity to get revenge. I made Bassanio nervous when I called Antonio a good man and they both probably knew the meaning. I'll show Antonio when his ships fail to return. Lancelot is getting on my nerves again. He is snail-slow in profit and he sleeps by day. My daughter seems to want to get out of the house and might be getting annoyed with me. I am sure that it is just a phase. Because it meant that Bassanio would lose even more of the money he borrowed I decided to attend the feast with all those creepy masks. I took no pleasure in it but I intend to ruin Bassanio. Bassanio will have all the ducats spent in no time. I forgot about my anger over my daughter's flight when I heard about Bassanio's ship wrecked in the English Channel. I then quickly remembered my daughters leaving when Tubal came to me with information on Jessica's reckless spending of my moneys. My heart was broken when I heard about I exchange for a monkey, she traded the ring that was a gift from my wife to me. I should have seen this coming. My hate turned into a disaster in only a short time today. First, Bassanio offered me double the money that was borrowed, but I was too stubborn to accept and reminded the court that the flesh was mine by law. I looked into Antonio's eyes and he seemed to have felt that he deserved what should have come. As I was sharpening my knife, Gratiano started abusing me. I guess I deserved what was happening but what happened next I'm not sure of. A lawyer came in and seemed to be on my side until she mentioned that I could only take Antonio's flesh, no blood. I was shocked to hear this but I then tried to accept the double amount but knew it was too late because that wasn't written on the bond. If that was not enough I could not just go home. The lawyer bent the law and would have taken away my life if it weren’t up to the Duke.

Geography and Culture Essay

The speech of Chief Seattle talked about the decline of the race of American Indians in the United States as long as the land that they used to till and call their own. The Whites have taken over their society and their culture is on the decline. Yet, he does not blame the Whites alone for their predicament; the chief also blames their young men and pointed out that change is very much present in the world. The Red men no longer seem to have rights and the need for country. California is a very dynamic society in the world today. If it became an independent country, it would be the fifth largest economy all over the world. Furthermore, it would also become the most populous State with the largest number of ethnicities present. It has the potential to become a cultural hub and exchange where various cultures and attitudes come together. The migration of different ethnic groups to California contributes to its prosperity. When ethnic groups go there, they also bring with them their contacts and their connections. In the process, these ethnic groups can connect with the rest of the world, enhancing the economic and cultural life of California. Through this backdrop of multiculturalism, the import and export trade of California is also enhanced. In this highly globalized world, connection with other nations and economies all over the world is highly desirable and can help enhance the economic prosperity of a nation.

Vegetartianism essays

Vegetartianism essays Vegetarianism as defined by The World Book Dictionary as "the practice or principle of eating only vegetable foods and refraining from eating meat, fish, or other animal products". This definition, though accurate, seems somewhat limited, as being a vegetarian is so much more: it is a lifestyle choice, a way of thinking, and a way of behaving. Over 12 million Americans and countless others, from all over the world, have turned to the vegetarian diet. People who have become vegetarians have made a conscious choice to be this and, having studied this practice, no one should entertain becoming a vegetarian lightly. Even though there are many benefits to becoming a vegetarian, the decision could also be harmful. There are many reasons for people to choose a vegetarian lifestyle. Some people adopt it as a fad, while others profess to do it because of an aversion to eating animals. There are religious reasons for not eating meat and still others follow vegetarianism as a way to lose weight, using it as a diet. In each case it can be a healthy or a harmful way to eat. The benefits or harm of vegetarianism is associated with two factors: education about nutritional needs coupled with food choices. Even groups like athletes can thrive on a vegetarian diet if they are well educated to the bodies' dietary needs and are well aware of the limit-less choices available on a vegetarian diet. What follows in this essay, is first: a brief, yet insightful look at the vegetarian diet (the nutritional aspect) and then: an analysis of how this diet may, in fact, be a good choice for an athlete. The first thing people need to realize is that there is more than just one type of vegetarian diet. In fact, there are three basic vegetarian diets to choose from. The first is the lacto-ovo diet. This diet includes the use of eggs and dairy products. The second one is the lacto diet, which also includes the use of dairy products but, unlike the ...

Comparing and Contrasting two World Famous Political Theorists essays

Comparing and Contrasting two World Famous Political Theorists essays Both leaders of their generations, Martin Luther and Niccolo Machiavelli were also religious and political icons. Through their theses, essays, and books they were able to successfully convey their views to the public. Martin Luther was a lawyer turned priest, who tried to open the eyes of the public to the general corruption of the Catholic Church. His 95 theses were the foundation of the Protestant Reformation, while Machiavelli used his skills as a writer, with The Prince, and other works, to bring to light the issues of politics. Known as the father of modern day politics, Machiavelli took his ideas public and changed government, as we know it. Both men were determined to break up the monopoly of knowledge and power that the Catholic Church held over the people. Through examination of Machiavellis The Prince, and Martin Luthers Christian Liberty, their different views on the individual, God, and the state will be compared and contrasted to better understand their issues wi th the Catholic Church. Many people say that Martin Luther started the Protestant Reformation by nailing his 95 theses on the front gate of the Catholic Church. Some of these people also say that these theses were an attack on the Church. Both of these statements are false. Martin Luther, a brilliant philosopher during the Renaissance, traveled to Rome in 1511 as the delegated representative of seven allied Augustinian monasteries to protest against some improvements of Staupitz. His experiences as a monk and a priest were fulfilling to his Catholic enlightenment. For example, his trip to Withberg to receive the sub-prior position helped Luther to gain respect and earn more important and valued positions with in the Church. While moving his way up in the Church, Luther was able to see the corruption and deceptiveness that the Catholic Church had become involved in. During his year associated with the Church, he was able to develop his...

Theories of Crime Essay Example | Topics and Well Written Essays - 1500 words

Theories of Crime - Essay Example For instance, contemporary criminologists make use of a ‘legalistic’ instead of a ‘normative’ description of criminal behavior. A legalistic description of criminal behavior takes as its basis the legal descriptions enclosed in the penal code. The law establishes what is criminal and what is not (Thacher, 2004, 381). Criminality involves the mechanisms of law-making, law-breaking, and acting in response toward law-breaking behaviors. These three mechanisms construct an integrated series of events. In addition, criminology is a methodical study of the biological, sociological and psychological aspects of criminal behavior (Thacher, 2004). The objective of this paper is to differentiate two of the most widely used criminology theories, sociobiology and attachment theories. The strengths and weaknesses of each of these theories will also be discussed. Biological accounts concerning criminal behavior were no longer encouraging in the early twentieth century. At this point in time, criminologist started to concentrate on sociological forces toward criminal behavior such as family background, social standing, peer group, and others (Hacking, 2006). The attempt and success of these criminologists was in fact viewed and though to be commonly illogical and unfounded empirically by the leading sociologists at the time. These particular sociologists embraced the idea referred to as ‘biophobia’, which clarified that they intentionally did not pay any attention or thought to biological aspects concerning any effort to understand human nature (Hacking, 2006). The contemporary research of sociobiology has hence reinvigorated interests in locating a foundation for criminal behavior in the biological aspect. Hence if genetics really manipulate or influence behavior, then it may also be accountable for understanding whether an individual

Siddartha Essay Example | Topics and Well Written Essays - 1250 words

Siddartha - Essay Example According to the four noble truths, suffering is an inherent part of existence, the source of suffering is ignorance, the main symptoms of ignorance are attached and craving and that this can ceased and lastly the noble eightfold path will cease the attachment and suffering. Wisdom cannot be achieved through following an enlightened one; this is evident from the book where Siddhartha and his friend part in search for enlightment, it cannot be achieved through words and teachings and the reason is because they may talk the truth but being concepts they trap you. To reach Nirvana one has to destroy the self in order to attain knowledge of the unknown innermost. When one reaches this state you experience peace and you lack desire and passion, this is illustrated in the book where the enlightened one is described as "Every finger of his hand spoke of peace, spoke of completeness, sought nothing, imitated nothing, reflected a continuous quiet, an unfading light, an invulnerable peace". To be wise you have to love the world and other people not because of their teaching but because of their deeds and their life, this is also in the book where Siddhartha explains to his friend that "It is only important to love the world, not to despise it, not for us to hate each other, but to be bale to regard the world and ourselves and all being with love, admiration and respect". (Hermann (1971) Siddhartha page 147) Above all you must learn to listen with a still heart, without passion, without desire and without judgment, you must listen with a waiting and an open soul, in the book Siddhartha learnt to listen from the river where he spent most of the time listening, this is also evident in the noble eightfold path where in order to achieve nirvana one has to have the right concentration. "Siddhartha learnt from the river how to listen, listen with a still heart, with a waiting, open soul, without passion, without desire, without judgment and without opinion". (Hermann (1971) Siddhartha page 106) To be wise you have to learn how to make sacrifices, Siddhartha learnt how to pray, fast and to think, this he got from the teachings of samana, and you must have self control and must not be destructed by earthly desires, for they will mislead you to what you are looking for. Siddhartha is a good example to illustrate this, he went to the city and forgot how to pray, think and fast. The world gave him much experience but did not give him the answer. Wisdom can be achieved only to those who sort it, it cannot be achieved through words and it needs action, Siddhartha left his home in search for knowledge, if he had not left home he wouldn't have reached nirvana. You must be ready to make sacrifices and not be led by desires, Siddhartha left his lover, wealth and the city to go live with the ferry man, this shows a lot of sacrifice and this is what one deserves to do in order to be wise. The decisions one makes must be right decisions, you should evaluate the options of anything that you do before