三相四线制有源滤波器不同指令电流检测方法的应用研究

Application Research on Different Command Current Detection Methods of Three Phase Four Wire Active Power Filter

面对不同的工程场景需求,要求有源滤波器既能补偿谐波电流,又能同时补偿谐波及无功电流。针对有源滤波器运用改进的ip-iq法来提取谐波电流,FBD与ip-iq结合的检测法来提取谐波及无功电流。前者可以同时检测出基波正、负序,不需要增加矩阵单独计算基波负序,后者经过简单的数学运算,减少了单纯使用ip-iq法时的计算量。通过理论分析与实验仿真,证明了两种不同检测电流指令的方法对三相四线制负载的补偿都有较好的补偿效果。

For different engineering scenarios,active powerfilter is required to compensate harmonic current and reactive current at the same time,In this paper,the improved ip-iq method is used to extract harmonic current for active power filter and the detection method combining FBD and ip-iq is used to extract harmonic and reactive current.The former can detect both positive and negative fundamental sequence at the same time without adding a matrix to calculate the negative fundamental sequence.The latter can reduce the amount of calculation by simple mathematical operation.Through theoretical analysis and experimental simulation,it is proved that two different methods of detecting current command have good compensation effect for three-phase four wire system load.