单周控制三相四线制有源电力滤波器的补偿性能研究

单周控制三相四线制有源电力滤波器具有检测量少、控制器结构简单以及鲁棒性强等优点。分析了系统的全局稳定条件和补偿后电流中直流分量的产生机理,研究了系统带不平衡负载和动、稳态补偿性能以及稳定性。结果表明,当系统参数满足全局稳定条件时,单周控制三相四线制有源电力滤波器具有较好的动、稳态补偿性能,并能抑制三相负载的不平衡。单周控制以峰值电流检测的调制方式导致补偿后电流中含有的直流分量是影响系统补偿性能的主导因素。

Research on the compensation performance of three-phase four-wire active power filter with one-cycle control

Three-phase four-wire active power filter(APF)with one-cycle control has such merits as few quanta need to be detected,simple control circuitry and robustness.The analysis of the whole region stability condition and the mechanism of the DC off-set in the compensated current of the system is proposed.The dynamic and steady compensation performance of the system as well as the lopsided load is also proposed.The results show that the system has an excellent dynamic and steady compensation performance for harmonic and rective currents as well as can suppress the imbalance of three-phase load if the system parameters meet the whole region stability condition.The DC off-set in the compensated current due to the peak current detection of the APF with one-cycle control is the main factor which degrades the compensation performance.