The term static is used to indicate that svcs, unlike synchronous compensators have no moving or rotating main components. Static var compensators svc in the power system power. Lessons learned in static var compensator protection. The benefits of stabilised voltage levels and reactive power compensation improves the system stability and increases the power transfer capability of a transmission line. Analysing series and shunt compensation engineering essay. Increased efficiency in power systems the svc is a solidstate reactive power compensation device based on high power thyristor technology. The main disadvantage of conventional compensators apart fr om the discrete contr ol method is the fact that they use. It directly responds to the variations in terminal voltage and does not use any thyristor switches or external control for voltage regulation.
Shunt capacitors do not affect current or power factor beyond their poin t of application. Transient stability assessment of power systems containing. Application of the posicast control method to static shunt. Page 1 of 3 voltage control and fault ride through paper by nget to gcrp. Generalcompensationpurpose static var compensator prototype. Introduction dynamic voltage support and reactive power compensation have been long recognized as a very significant measure to im prove the performance of electric power systems. Shunt capacitors are relatively inexpensive to install and maintain. International journal of mechatronics, electrical and computer technology vol. The static synchronous compensator statcom and static var compensator svc are 2 of these shunt compensators belonging to the. Where this period of unavailability cannot be accommodated by the. Uettdrsb30a maintain high voltage power system static. Rogers, fellow, ieee abstract this paper discusses and compares different con trol techniques for damping undesirable interarea oscillation in.
What links here related changes upload file special pages permanent link page. Results will be compared by analyzing their performance when subjected to changes on the system, and problems that arise when connected to the system. The main function is to regulate the voltage at a given bus by. The sssc operates like a controllable series capacitor and series inductor. The usage of shunt capacitor banks suffers from the following drawbacks. Its objectives includes, among other things, the modeling and simulation study of the use of svc in the nigeria 31bus 330 kv power transmission network, using. Blanquez, charlesmathieu genton cern european organization for nuclear research 1211 geneva 23, switzerland karsten. Shunt connected reactors fixed or mechanicallyswitched are applied to minimize line over voltageunder light load conditions.
They enable continuous control, both in steady and fastchanging states. An analysis of system requirements related to transient voltage control is presented as well as an investigation of the suitable dynamic performances of. Objectives of series compensation, variable impedance type and thyristors switched series capacitors tcsc, and switching converter type. Wtgs, static synchronous compensators statcoms, static var compensators. A static synchronous compensator statcom, also known as a static synchronous condenser statcon, is a regulating device used on alternating current electricity transmission networks. Static compensators statcoms in power systems by farhad. Shunt power compensators are the most modern group of compensators. Static var compensators svc, power system damping, swing oscillations, power system stability 1.
Both solutions are modeled and simulated using pscad. A static var compensator is capable of both generating and absorbing variable reactive power continuously as. How facts controllers benefit ac transmission systems meppi. The description of selected control features of shunt power systems such as svc static var compensator static compensators of reactive power, statcomtype systems static compensator, static.
Variable shunt susceptance model of svc 12 is shown in fig. In this paper modeling and simulation study of the use of static var compensator svc for voltage control in nigeria transmission network have been done using simpowersystems psat software. Remote supervisory control and manual adjustment of the voltage setpoint are also common. The design and performance of static var compensators for particle accelerators karsten kahle, francisco r. Application of static var compensator in entergy system to address voltage stability issues planning and design considerations sharma kolluri, pe, ieee fellow entergy services, inc. Application of static compensators in radial power systems. Voltage control of transmission system using static var.
Series compensation series compensation is basically a powerful tool to improve the performance of ehv lines. The primary difference is that its injected voltage is not related to the line intensity and can be managed independently. Static var compensators in the victorian electricity transmission network. Static var compensator the static var compensator svc is a device of the flexible ac transmission systems facts. Shunt compensation static var compensator svc sr,tcr,fctcr,tsc. Application of static var compensators to increase power. Exercise 1 main components of a static var compensator svc. Currently, compensators of this type are most widely used in the nps. Industrial static var compensator svc nowadays, the quality of the electricity supply is becoming more important due to the use of sophisticated computer controlled systems. Static var compensators are shuntconnected static var generators or absorbers whose outputs are varied to control specific parameters of the system.
Svc and statcom inductive current is positive is derived and summed to the reference vp1. A new static var compensatorsvc system using threelevel inverter is proposed f o r high voltage and high power applications. Both issues mean that the shunt device is unavailable if called upon twice or more in a short time. Placement of shunt var compensator based on sensitivity analysis. The thyristor switch assembly in the svc controls the reactor.
Shunt compensation for improvement of voltage stability. The firing angle of the thyristor controls the voltage across the inductor and thus the current flowing through the inductor. One of the reasons for installing the static var compensator to improve the voltage profile and increases the system lodability. Objectives of shunt compensation steadystate transmittable power can be increased. Static var compensators are used in transmission and distribution networks mainly providing dynamic voltage support in response to system disturbances and balancing the reactive power demand of large and fluctuating industrial loads. The type of thyristor used for the variable type series compensators has an impact on their performance. Static synchronous series compensator sssc power quality. However, static var compensators are more expensive than mechanically switched capacitors, so many system operators use a combination of the two technologies sometimes in the same installation, using the static var compensator to provide support for fast changes and the mechanically switched capacitors to provide steadystate vars.
Pdf shunt compensator as controlled reactive power sources. Static synchronous series compensator sssc is a modern power quality facts device that employs a voltage source converter connected in series to a transmission line through a transformer. I n steadystate and dynamic n z performance of the static. A shunt compensator injects the reactive power if the systems voltage is lower. A shunt connected static var generator or absorber whose output is adjusted to exchange capacitive or inductive current so as to maintain or control bus voltage of the electrical power system. The abb static var compensator includes the following major components. Utility static var compensator svc the static var compensator for utilities increases the quality of power in many respects. Static var compensator svc has a general topology and its operational principle allows its. A static var compensator svc is a set of electrical devices for providing fastacting reactive power on highvoltage electricity transmission networks. Entergy system to address voltage stability issues planning and design considerations sharma kolluri, pe, ieee fellow. Mar 04, 2018 shunt and series compensation through various static compensators, with which heshe can able to apply the above conceptual things to realworld electrical and electronics problems and applications.
The purpose of, this reactive compensation is to chage the natural electrical. Svcs are part of the flexible ac transmission system device family, regulating voltage, power factor, harmonics and stabilizing the system. Svc compensators the largest group of shunt power compensators consists of the compensators belonging to the svc group. Examples include static var compensators svc, synchronous condensers, and generators. A static var compensator svc is a set of electrical devices for providing fast acting reactive. A general and simple model f o r the overall system is obtained using circuit dqtransform and dc and ac analyses are achieved to characterize the openloop system. Performance analysis of static var compensators svc, on congestion management and voltage profile in power system by matlabpsat houari boudjella, fatima zohra gherbi, fatiha lakdja and hafsa sahnoune abstract transmission congestion must be managed so that transmission capacity is utilized as efficiently as possible with.
It is based on a power electronics voltagesource converter and can act as either a source or sink of reactive ac power to an electricity network. Svc static var compensator an insurance for improved grid. The reactive power supplied by the shunt capacitor banks is directly proportional to the bus voltage. Installing shunt capacitors in the load area or at the point where compensation is necessary increases the voltage stability. Using the screen captures of the oscilloscope window you saved to files, can. If connected to a source of power it can also provide active ac. A flexible alternating current transmission system facts is a system composed of static. A static synchronous compensator for reactive power. Uettdrsb30a maintain high voltage power system static var compensators svc modification history not applicable.
Shunt compensation installation 9 synchronous condenser cs 14 static compensator svc total capacity of 7000 mvar capacitive 4000 mvar inductive main purposes postevent network stability part of the voltage level control actual control strategy same strategy in use since deployment in 197080. Effect of static shunt compensation on power system dynamic. A static var compensator has no significant moving parts other than internal switchgear. An analysis of system requirements related to transient voltage control is presented as well as an investigation of the suitable dynamic performances of the svc to meet those requirements. Static var compensator is basically a shunt connected static var generator whose output is controlled by adjust the value of capacitive or inductive current. The effective reference vfir controlling the terminal voltage thus becomes vfirt. Load flow sensitivity to develop the model, load flow sensitivity is used based on newtonraphson method. In shunt compensation, power system is connected in shunt parallel with the facts. Increased efficiency in power systems the svc is a solidstate reactive power compensation device based on. The static var compensator svc market was valued at usd 643.
It is able to transfer both active and reactive power to the system, permitting it to compensate for the resistive and reactive voltage drops maintaining high effective xr that is independent of the degree of series. It consists of capacitors connected in series with the line at suitable locations. Widearea voltage control of dynamic shunt compensation using. If the reactive power of the load is changing rapidly, then a suitable fast response compensator is needed.
The base year used for study is 2014 and the forecast period considered is between 2015 and 2020. Application of static var compensator in entergy system to. Shunt capacitor slope correction capacitor damping filter figure 3. The description of selected control features of shunt power systems such as svc static var compensator static compensators of reactive power, statcom. International journal of mechatronics, electrical and. A static var compensator is a parallel combination of controlled reactor and fixed shunt capacitor shown in the figure below. Performance analysis of static var compensators svc, on. Download for offline reading, highlight, bookmark or take notes while you read static compensators statcoms in power systems. Pdf comparison of shunt capacitor, svc and statcom in. Typically, an svc comprises one or more banks of fixed or switched shunt capacitors or reactors, of which at least one bank is. Static var compensator svc is a power quality device, which employs power electronics to control the reactive power flow of the system where it is connected. Comparing secondary voltage regulation and shunt compensation.
The design and performance of static var compensators for. May 31, 2012 static synchronous series compensator works like the statcom, except that it is serially connected instead of shunt. Some aspects of the application of the static var compensator svc in a radial and passive load power system are described. When system voltage is low it generates the reactive power. Jawaharlal nehru technological university hyderabad iv year b. This has been recognised by the electrical utilities, which penalise user for disturbances. In other words, static var compensators have their output adjusted to exchange inductive or capacitive current in order to control a power. Objectives of shunt compensation, methods of controllable var generation, static var compensators, svc and statcom, comparison between svc and statcom. Static compensators statcoms in power systems ebook written by farhad shahnia, sumedha rajakaruna, arindam ghosh. As a result, it is able to provide fastacting reactive power compensation on electrical systems. This article contains a concise description of selected control features of shunt power systems such as. Static compensators can be divided into conventional and power compensators. Widearea voltage control of dynamic shunt compensation.
Hingorani and others published static shunt compensators. Shunt compensator as controlled reactive power sources. Placement of shunt var compensator based on sensitivity. Putmanprinciples and applications of static, thyristorcontrolled shunt compensators. Shunt compensation for improvement of voltage stability using. The main reactive plant components include capacitor canisters and shunt reactors which are situated in the. Compensators svc, on congestion management and voltage profile in power system by matlabpsat houari boudjella, fatima zohra gherbi. Compensators svc are considered as shunt var compensators, where static synchronous series compensator sssc and thyristor controlled series capacitors tcsc are series var compensators. Performance analysis of shunt reactive power compensators.