一种STATCOM指令电流检测及控制策略研究

Study of Detection and Control Strategy of STATCOM Instruction Current

基于瞬时无功理论的静止同步补偿器(STATCOM)指令电流检测法在现有检测技术中得到了广泛应用,但指令电流检测的实时性会受到低通滤波器(LPF)性能与坐标变换的影响。提出采用锁相环(PLL)来获取负载基波有功电流相位,从而构造出等效基波电流,提取出谐波和无功电流的方法。基于该检测算法,提出了相应的直流侧电压控制策略,并进行了近似算法的误差分析。最后,对所提指令电流检测算法以及控制策略进行了仿真和实验验证,结果表明该方法在提取谐波上存在理论误差,但直流侧电压控制的引入使该误差得以消除,不影响STATCOM的正常工作。

The application of static synchronous compensator （STATCOM） instruction current detection method that based on the instantaneous reactive power theory is universal. However, the complexity of the coordinate transformation and the low-pass fdter（LPF） design badly affected the real-time detection of the harmonic.The information of the active fundamental with the phase-locked loop （PLL） is acquired, the equivalent load fundamental can be constructed, and the harmonic and reactive current can be obtained.Meanwhile,the DC side voltage control modus is put forward and the error analysis of the approximation algorithms to match the detection method are finished.Finally,the simulation and experiment are achieved, both of the results verified that even the detection method has the theoretical error, however, the introduction of the DC voltage control made this error can be eliminated, which does not affect the normal work of the STATCOM.