四桥臂并联型有源滤波器复合控制策略

Compound control of four-leg shunt active power filter

针对四桥臂并联型有源滤波器(SAPF)的拓扑结构,将广义积分器与基于abc坐标系的三维空间矢量PWM(3-D SVPWM)相结合,提出一种新的复合控制策略。其中,广义积分器能够无稳态误差地对特定频率次谐波进行补偿;而3-D SVPWM直流侧电压利用率高,稳定性好,易于数字实现。建立四桥臂SAPF仿真模型并进行仿真分析。仿真结果表明采用所提出复合控制策略的四桥臂SAPF能有效补偿三相电网谐波、基波负序、零序及中线电流,且能对谐波进行分次补偿,兼具较快的动态响应速度和较小的稳态误差,验证了该复合控制策略的正确性和可行性。

According to the topology of four-leg SAPF（Shunt Active Power Filter）,a compound control strategy is put forward,which combines the generalized integrators with the abc-coordinates-based 3-D SVPWM（3-Dimensional Space Vector Pulse Width Modulation）. The generalized integrator compensates the specified harmonic without static error while the 3-D SVPWM has higher DC voltage utilization ratio,better DC voltage stability and easier digital realization. The simulation model of four-leg SAPF is built and analyzed,and results show that it compensates the three-phase network harmonic currents,negative-sequence fundamental current,zero-sequence fundamental current and neutral current effectually and order-specifically, with both faster dynamic response and smaller static error,which verifies its validity and feasibility.