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大量关于有源电力滤波器的研究仅限于三相三线制系统 ,而没有考虑三相四线制系统。针对不对称三相四线制系统中零序电流的补偿 ,提出采用三相四线制并联有源电力滤波器来滤除其中的零序电流。详细阐述了这种三相四线制并联有源电力滤波器的主电路结构、工作原理、数学模型和检测方法 ,并提出了一种不经过坐标变换的滞环控制法。仿真结果表明这种有源电力滤波器能有效滤除三相四线制系统中的基波零序、基波负序和谐波等有害电流。
A lot of research on active power filter is limited to three-phase three-wire system, without considering the three-phase four-wire system. In order to compensate the zero-sequence current in asymmetric three-phase four-wire system, a three-phase four-wire shunt active power filter is proposed to filter out the zero sequence current. The main circuit structure, working principle, mathematical model and detection method of the three-phase four-wire parallel active power filter are expounded in detail. And a hysteresis control method without coordinate transformation is proposed. Simulation results show that the active power filter can effectively filter harmful currents such as fundamental zero sequence, fundamental negative sequence and harmonics in three-phase four-wire system.