Research On Modeling And Simulation Of Static Var Generator In Low Voltage

With the rapid development of social economy, electrical energy as a kind of clean,effective and available energy pattern has become the important material guarantees of social economic fast development and it is the premise of all kinds of high technology and information technology is effective used. With the improvement of requirement about power quality and flexible A.C electrical power transmission, the problem of reactive power compensation has become more and more important in power quality field. As the effective method of power system reactive power compensation, static var generator has gradually become the hot research point. The paper aims to study the design,modeling and simulation of low-voltage static var generator and it can also provide the theoretical consideration in practical applicationIn this paper, three kind of reactive current detecting algorithms are proposed. They include the algorithms of p-q based on instantaneous reactive power theory, the algorithms of ip-iq and the algorithms of dq0 reactive detecting. Through the simulation, this paper inspects and verifies the degree of accuracy based on reactive detecting method and the response ability. Furthermore, this paper also analyses the cause of errors using these algorithms and conclude the application scope of there kinds of reactive current detecting algorithms. Meanwhile, this paper inspects and verifies the two current control methods based on three-phase three-wire system and makes a comparation between loop control and triangular comparation control.This paper simulates the control system using MATLAB, makes a model of the three kinds of reactive current detecting and two control strategies simulation models, and makes a model of electric power source. Through the comparation between the two control strategies that is loop control and triangular compatation control, we can conclude that the advantages and disadvantages of two control strategies. And through the simulation to three-phase asymmetrical voltage using the algorithm of triangular compatation control, we can compare the two kinds of conditions that are in different voltage degree of asymmetry. At last, it is proved that all kinds of algorithms used in this paper have a good condition and it is also proved to be effective.