基于谐波磁势平衡的12脉波整流器一体化滤波方法

Integrated Filtering Method of 12-pulse Rectifier Based on Harmonic Magnetic Potential Balance

提出了一种基于谐波磁势平衡的12脉波整流器一体化滤波方法,对该一体化滤波器的拓扑结构、数学模型、滤波原理进行了详细阐述。该方法将一个背靠背变流装置接入12脉波整流器变压器二次侧的星形与三角形绕组抽头中,通过背靠背变流装置向各绕组抽头中注入指定次谐波电流,并利用该注入谐波电流与12脉波整流器负荷侧所产生谐波电流的磁势平衡,以达到消除12脉波整流器网侧指定次谐波电流的功能,在控制算法上引入比例-积分(PI)+比例-谐振(PR)控制器以实现对指定次谐波分量的无误差跟踪。该方法能有效提高滤波变流装置的电压、电流适应性,从而节省电压匹配变压器的成本,并能充分发挥滤波变流装置的容量潜能。最后,通过仿真和实验验证了所提滤波方法的正确性。

An integrated filtering method for 12-pulse rectifier based on harmonic magnetic potential balance is proposed.The topology,mathematical model and filtering principle of the integrated filter are explained in detail.In this method,a back-to-back converter is connected to the tap of star and delta windings on the secondary side of 12-pulse rectifier transformer.The specific harmonic current components are injected into each winding tap through the back-to-back converter.By using the magnetic potential balance between these harmonic components generated by back-to-back converter and the harmonic components generated by the load side of 12-pulse rectifier,the specific harmonic current components on the grid side of 12-pulse rectifier can be eliminated well.The proportional-integral(PI)+proportional-resonant(PR)controller is adopted to realize error-free tracking of the specific harmonic components.The proposed method can improve the voltage and current adaptability of the filter converter,so the cost of voltage matching transformer can be saved effectively and the capacity potential of filter converter can be used fully.Finally,the correctness of the proposed filtering method is verified by simulation and experiment.