一种新型基于双闭环PID控制的SVC控制系统研究

Study of Novel SVC Control System Based on Double Closed-Loop PID Controllor

基于瞬时无功功率理论和双闭环PID控制构架,设计了一种新型的FC-TCR型SVC控制系统。为实时补偿电网中瞬时无功功率的变化,采用dq同步旋转坐标变换方法,精确检测系统功率,有效克服电网电压波形畸变给p、q运算方法带来的误差;采用双闭环PID控制结构,内环为电压调节,外环为功率因数校正,使SVC装置能同时达到功率因数校正和改善电压的目的。仿真研究结果表明,此新型SVC控制系统对稳定和抑制电压波动,提高功率因数,具有响应快、精度高的特点。

Based on instantaneous reactive power theory and double closed-loop PID control strategy, a novel FC-TCR static var compensator （SVC） control system was designed. In order to real-time compensate reactive power change of system, a dq synchronized rotating coordinate transform method was proposed to make the measurement of power more accurate, which can effectively decrease the effect of voltage distortion with the p, q method, A double closed-loop PID controller, consisting of voltage regulating loop （internal loop） and power factor correction loop （external loop）, was used to both correct the power factor and regulate the voltage fluctuation. The simulation research results show that the novel SVC control system can damp the voltage harmonic distortion and improve the power factor and it has the advantage of quick response and high precision.