Research On Static Var Compensator Based On Reactor Variable

In power system, there are a lot of reactive power consumption of equipment, the use of these devices will make a dramatic fluctuations in supply voltage, such as the impact of reactive power load:rolling machine, electric arc furnaces, electric and railway. Meanwhile, there are a large number of users on the system voltage stability of high precision equipment requirements:such as computers, medical equipment. If reactive power can not be controlled in time, will be on the grid security, stability, adversely affect the operation. In addition, the shortage of reactive power reserves will lead to a lower level of power voltage. For these reasons, how quickly and effectively compensate reactive power system gap has important practical significance.The variable reactor based on power conversion consists of variable reactance converter and electronic power inverter. The intelligent controller controls electronic power inverter in order to change the electric current in the second side of variable reactance converter, then the one in the primary side can be changed, consequently the impedance of variable reactor can be changed.Firstly it explains the different types of shunt static reactive power compensation device's main circuit topology, the basic operation principle and the reactive power control process.Then, for large electrical equipment and industrial power distribution system in the fast reactive power compensation problem, a variable impedance device SVC appears. Construction of variable impedance based static var compensator architecture, static var compensator can be transforming the main reactor by the fixed capacitors and intelligent controller and other components. Through intelligent control of power electronic power converter controller, transformer reactor can change the secondary winding current, thus changing the reactor can be a transformer winding current to achieve impedance variable. When the input voltage is constant, transforming reactor to achieve admittance changes, you can change the fundamental current, resulting in reactors absorb reactive power changes. Reactor can meet the substation shunt capacitor, the reactive power can be smoothly adjusted to achieve dynamic reactive power compensation.Transforming the structure can have a reactor winding and secondary winding, a winding with a fixed capacitor and the load and then to form a parallel circuit impedance, secondary windings and power electronic power converter phase, constitute the second impedance conversion circuit. Through the static var compensator topology analysis, from the impedance and admittance transformation transform the two aspects of the publicity derived to explain the static var compensator compensation mechanism, in reaching its reactive power compensation of the operational characteristics.Finally, the introduction of the reactor can be in transforming the composition of components, including anti-converter transformer, power converter, etc., and in MATLAB/SIMULINK simulation platform for transforming anti-Based Static Var Compensator for modeling and simulation, the simulation waveform to verify the correctness of the control strategy, and the characteristics of SVC compensation. In the article also uses FFT harmonic analysis module.