1.Power China Zhongnan Engineering Co., Ltd., Changsha 410014, China;2.College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
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.
This work is supported by National Natural Science Foundation of China (No. 51477044).
|||WANG Tao, PENG Guorong, HU Junxuan, et al. Integrated Filtering Method of 12-pulse Rectifier Based on Harmonic Magnetic Potential Balance[J]. Automation of Electric Power Systems,2020,44(8):157-167. DOI:10.7500/AEPS20190808006|