三相四开关并联型有源电力滤波器选择性谐波补偿方法

Selective Harmonic Compensation Method for Three-phase Four-switch SAPF

提出一种三相四开关并联型有源电力滤波器(three-phase four-switch shunt active powerfilter,TFSAPF)选择性谐波补偿方法。三相四开关结构可以降低系统硬件成本,但相比于传统的三相六开关逆变器,由于主电路中的电力电子器件数量减少,因此更容易出现容量不足问题。因此,本文采用选择性谐波补偿策略,针对系统的重点次谐波进行有选择性的补偿,放弃含量较低的谐波及高次谐波。首先利用选择性谐波检测算法计算参考电流值;通过三相四开关电压空间矢量脉宽调制策略(space vector pulse width modulation,SVPWM)跟踪该参考值;最后通过实验对系统的5次、7次、11次、13次、17次和19次等6k±1次谐波进行有选择性的补偿,证明了该方法的有效性。

In this paper,the selective harmonic compensation method for a kind of three-phase four-switch shunt active filter（TFSAPF for short）is proposed.The TFSAPF structure can reduce hardware cost of the system,but compare to the traditional three-phase inverter,the problem of insufficient capacity is easily occurred due to reduction of the number of power and electronic elements in the main circuit.Therefore,selective harmonic compensation strategy is adopted in this paper for selective compensation for the important sub-harmonic and the harmonic with low contents and ultra harmonic are abandoned.Firstly,the reference current is calculated by the use of selective harmonic detection algorithm and the reference value is tracked through three-phase four-switch voltage space vector pulse width modulation strategy（SVPWM for short）.Finally,the selective compensation for 6k±1 harmonics（i.e.,5,7,11,13,17 and 19）of the experimental system is performed and the effectiveness of the method is proved.