The thyristor switch assembly in the svc controls the reactor. Dan sullivan, jan paramalingam, mitsubishi electric power product inc. The abb static var compensator includes the following major components. Apparent power s or total power s is the combination of active and reactive power. Static var compensators svc, power system damping, swing oscillations, power system stability 1. Use of static var compensator in system has shown considerable increase. Exploring power electronics simulation and chil testing with the rtds simulator duration. Pdf selection of static var compensator location and size for.
Proper placement of svc and thyristor controlled series compensator tcsc reduces transmission losses. Five static var compensators 50250 mvar are being installed in the south african 400 kv system of. This is a way of adding either capacitance or inductance to the electricity system, depending on which is needed. Static var compensator svc, reactive power compensation, power quality, particle accelerator, harmonic filtering. An svc at 33 kv through a transformer is overall voltage stability of the system. Static var compensator models for power flow and dynamic. In other words, static var compensators have their output adjusted to exchange inductive or capacitive current in order to control a power. Static var compensator solutions ge grid solutions. Modeling and simulation of static var compensator with matlab. These solutions are highly reliable, easy to integrate into both existing and new infrastructures, and reduce the investment required for building new network. The design and performance of static var compensators for particle accelerators. Effect of fuzzy controller and changing 193 functions are more popular with the fuzzy logic theory, the reason being the simplicity of function, allowing for the prediction and calculation of an output of the fuzzy system10.
A static var compensator or svc is an electrical device for providing fastacting reactive power on highvoltage electricity transmission networks. Moga is applied to solve this complex multiobjective optimization problem. Their fast response offers a high potential for power system stability enhancement apart from steadystate flow control. Abb has installed a static var compensator svc rated at 33 kv. Svc is based on thyristors without gate turnoff capability. Pdf this paper presents a new method which applies the application. Voltage stability enhancement through static var compensator. Pdf version67kb tokyo, august 25, 2014 mitsubishi electric corporation tokyo. A static var compensator has no significant moving parts other than internal switchgear. Ges static var compensator svc solutions are a costeffective and efficient means to provide dynamic voltage support and maintain the reliability and efficiency of power supply.
This paper will discuss how static var compensator successfully been applied to control transmission system. In three phase applications, the units are typically connected in delta. Shunt compensation for improvement of voltage stability. The svc regulates voltage at its terminals by controlling the amount of reactive power injected into or absorbed from the power system.
A new static var compensatorsvc system using threelevel inverter is proposed f o r high voltage and high power applications. Merus static var compensator svc, another part of the merus facts family, is built on proven thyristor technology. Mitsubishi electric news releases mitsubishi electric. The research study is limited to the new haven 2 33kv transmission network. Voltage stability improvement using static var compensator in power systems mark ndubuka nwohu 168 voltage, phase angle andor impedance at particular points in power systems.
The firing angle of the thyristor controls the voltage across the inductor and thus the current flowing through the inductor. This paper presents the potential applications of static var compensator svc as one of the factsflexible alternating current transmission system controllers, using power electronic switching devices in the fields of power transmission systems with increasing the voltage and power flow in distribution substations. 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. A static var compensator is a parallel combination of controlled reactor and fixed shunt capacitor shown in the figure below. Static var compensator 4 the static var compensator increases the quality of power in many respects. 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. Static var compensator is one of the solutions for these problems. A static var compensator svc is used to regulate voltage on a 33 kv, 3.
A svc of finite reactive power rating is placed at the load center in two bus equivalent model and it is shown in fig. Whensystem voltage is low the svcgenerates reactive power svc capacitive. This research improved the voltage profile of new haven 233kv transmission network using. Static var compensatorsvc by providing dynamic reactive power svc can be used for the effectively control the reactive power, improve the power factor, purpose of regulating the system voltage compensating the voltage reduce the voltage influence and harmonic interference caused by at a reasonable level, improving the power flow capacity of. The svc is a shunt device of the flexible ac transmission systems facts family using power electronics. These can be used as part of a static var compensator svc. An svc can improve power system transmission and distribution performance in a number of ways. This research improved the voltage profile of new haven 2 33kv transmission network using static var compensators.
Lessons learned in static var compensator protection aaron findley, mychal hoffman, power engineers, inc. Load flow analysis of 3311 kv distribution substation is performed to. Since the transmitted load often varies considerably from one hour to the next, the reactive power balance in a grid varies as well. Siddiqui1, tanmoy deb2 jamia millia islamia, new delhi, research scholar jmi email. As the load varies in a distribution system, a variable voltage drop will occur in the system impedance, which is mainly reactive.
The siemens static var compensator in the radsted highvoltage switchgear station. Static var compensator is a shuntconnected static var generator or absorber whose output is adjusted to exchange capacitive or inductive current so as to maintain or control specific parameters of the electrical power system typically bus voltage. Improvement by voltage profile by static var compensators. A static var compensator svc is used to regulate voltage on a 500 kv,3000 mvasystem. An improvement of voltage profile using static var. Svcs are part of the flexible ac transmission system device family, regulating voltage and stabilizing the system. Tilford, solving a potential voltage stability problem with the application of a static var compensator, proceedings of the ieee pes general meeting, june 2007, tampa, fl.
The sssc operates like a controllable series capacitor and series inductor. Static var compensators are used by utilities in both transmission and. The primary difference is that its injected voltage is not related to the line intensity and can be managed independently. The data used was the peak loads recorded for the month of april, 2018. Increased efficiency in power systems the svc is a solidstate reactive power compensation device based on high power thyristor technology. The highest value of fitness function gives optimum location of svcs in given single line diagram. Ga gives set of values of fitness function for each case considered. Improvement by voltage profile by static var compensators in distribution substation. The aircore reactors are series connected to thyristors. I n steadystate and dynamic n z performance of the static.
When system voltage is high it absorbs reactive power svc inductive. An improvement of voltage profile using static var compensators. Pdf the static var compensator svc device in the power. System under study a power generation station along with an svc connected to infinite bus. Svcs are often modeled as a conventional pv generator bus with reactive power limits. Static var compensator a 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 porate et al. The static var compensator svc is generally used as a voltage controller in power systems. The design and performance of static var compensators for. Pdf this research improved the voltage profile of new haven 233kv transmission network using static var compensators. Simulation analysis of the static var compensator in the normal working. Apparent power is measured in va, kva, mva power factor cos it is a measurement of the efficiency in a system. Varset hybrid system documents and downloads schneider. Some highvoltage substations contain large aircored reactors a reactor in this context is just a large coil.
The static var compensator s stateoftheart high voltage thyristor valve, reliable controller, modern user interface and redundant technical design are combined into a fast, reliable and robust system that is easy to operate and complies with all standard communication protocols. The static var compensatorsvc is composed of the capacitor banksfilter banks and aircore reactors connected in parallel. The benefits of reactive power compensation, more constant voltage levels and reduced distortion levels are transferred to the end user as production increases, total power losses are reduced, and reactive power penalties are avoided. Ges static var compensator svc solution allows grid operators to gain accurate control of reactive. Run the simulation and observe waveforms on the static var compensator scope block, the simulation waveforms for the static var compensator is shown in fig. Voltage control of transmission system using static var. It can help maintain the voltage magnitude at the bus it is connected to at a desired value during load. Pdf an improvement of voltage profile using static var. To overcome the under voltage at the 11kv, 33kv feeder buses and 2 kv buses capacitor bank of suitable ratings are added. Svcs are part of the flexible ac transmission system device family, regulating voltage, power factor, harmonics and stabilizing the system.
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. The voltage the voltage level of the system changes when there is a change in load and the drop in load voltage lead to demand for the reactive power. Svc static var compensator an insurance for improved grid. Introduction dynamic voltage support and reactive power compensation have been long recognized as a very significant measure to im prove the performance of. As a result, it is able to provide fastacting reactive power compensation on electrical systems. The current of aircore reactors can be controlled by adjusting the fire angle of thyristors. A simple and direct method of determining the steady state voltage stability limit of a power system after the placement of static var compensator svc is presented in reference 17. Voltage stability improvement using static var compensator. The static var compensator svc is a shunt device of the flexible ac transmission systems facts family using power electronics to control power flow and improve transient stability on power grids 1. 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. Varset hybrid system realtime infinitely variable reactive compensation system.
Application of static var compensators to increase power. Voltage stability enhancement through static var compensator a. Thyristorbased static var compensator introduction. The static var compensator is connected parallel with the. Proper placement of static var compensator svc and thyrlstor controlled series compensator tcsc reduces transmission losses, increases the available capacity, and improves the voltage profile. The stateoftheart merus thyristor valve is extremely compact in design and delivers superior performance compared with other solutions available in the market.
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