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为了提高有源电力滤波器的可靠性,针对负载电流波动和负载突停等工况时导致直流侧电压波动过大而无法正常补偿谐波等问题,研究了一种基于多同步坐标旋转的直接谐波提取方法,并将d-q谐波提取方法和直接谐波提取方法对直流侧电压控制的影响进行了分析和对比。提出了把直接谐波提取方法和复合重复控制相结合的指定次补偿控制策略,该策略不仅由于采用直接谐波提取保证了系统的可靠性,与复合重复控制结合也保证了系统的动态性能和稳态精度,而且可以指定次谐波补偿,补偿灵活。仿真和实验结果证明了研究内容的有效性。
In order to improve the reliability of the active power filter, aiming at the problems that the voltage fluctuation of the DC link is too large and the harmonic can not be properly compensated when the load current fluctuates and the load suddenly stops, a direct rotation based on multiple synchronous coordinates Harmonic extraction method, and dq harmonic extraction method and the direct harmonic extraction method on the DC side of the voltage control were analyzed and compared. The proposed secondary compensation control strategy which combines the direct harmonic extraction method with the compound repetitive control is proposed. This strategy not only ensures the system reliability by adopting direct harmonic extraction, but also ensures the dynamic performance of the system in combination with the compound repetitive control. Steady-state accuracy, but also can specify sub-harmonic compensation, flexible compensation. Simulation and experimental results prove the validity of the research.