针对应用于三相四线制系统中的三相四桥臂有源电力滤波器的特点，研究了一种基于零序电流解耦的预测电流控制方法，分析了零序电流解耦的原理，设计了控制系统。该方法有效地解除了第四桥臂和前三桥臂的耦合，对中线电流进行独立补偿，与三相三桥臂的控制方法兼容，简单易行，易于对三桥臂有源电力滤波器进行改造后应用于三相四线系统。仿真分析表明，与其他方法相比，基于零序电流解耦的预测电流控制可使有源电力滤波器获得更好的补偿性能，电源电流总谐波畸变率和中线电流正负峰值均达到最小。%Zero-sequence current decoupling based predictive current control of three-phase four-wire active power filter (APF)is studied based on the characteristics of three-phase four-leg APF.The principle of zero-se-quence decoupling is analyzed and the control system is designed.The control method eliminates the coupling between the first three legs and the fourth leg,and the neutral current is compensated independently.The meth-od is compatible with the control of three-phase three-leg APF and is simple to implement.It is easy to upgrade the three-leg APF to meet the three-phase four wire applications.Simulation analyses show that zero-sequence current decoupling based predictive current control achieves better compensation performance than other meth-ods,total harmonic distortion of supply currents and positive egative amplitudes of neutral current are both with minimum.
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