基于直接电流控制的静止无功发生器仿真

Simulation on static var generator based on direct current control

随着接入电网中的电力电子设备的增多,电网系统中出现大量无功电流,使电网环境受到严重影响。静止无功发生器不仅可以检测电网中的无功电流,还能使电网中的电压和电流的相位保持一致,达到无功功率动态补偿的目的。本文主要分析静止无功发生器的核心算法,采用基于电压定向的直接电流控制方式,在MATLAB/Simulink中建立系统模型,完成对电压、电流信号的采集并进行dq变换,实现对算法的仿真验证。仿真结果表明,在给定的条件下,静止无功发生器可以很好地补偿无功,提高电网功率因数,且响应速度快。

With the increase of power electronic devices connected to the power grid,a large amount of reac-tive current appears in the power grid system,which seriously affects the power grid environment.The static var generator can not only detect the reactive current in the power grid,but also keep the phases of the voltage and the current in the power grid consistent,so as to achieve the purpose of dynamic reactive power compen-sation.This paper mainly analyzes the core algorithm of the static var generator,adopts the direct current con-trol method based on voltage orientation,builds the system model in MATLAB/Simulink,completes the ac-quisition of the voltage and current signals and performs dq transformation,and realizes the simulation verifi-cation of the algorithm.The simulation results show that under the given conditions,the static var generator can compensate the reactive power well,improve the power factor of the grid,and the compensation method has a fast response speed.