A series-connected 36-pulse rectifier for HVDC with a dual passive harmonic injection method
DOI:DOI: 10.19783/j.cnki.pspc.211569
Key Words:HVDC  series-connected rectifier  dual passive harmonic injection  turn ratio design of transformers  failure tolerance  harmonic suppression
Author NameAffiliation
WANG Ying 1. Lanzhou Jiaotong University, Lanzhou 730070, China
2. Key Laboratory of Opto-Technology and Intelligent Control Ministry of Education, Lanzhou Jiaotong University, Lanzhou 730070, China 
WANG Yalan 1. Lanzhou Jiaotong University, Lanzhou 730070, China
2. Key Laboratory of Opto-Technology and Intelligent Control Ministry of Education, Lanzhou Jiaotong University, Lanzhou 730070, China 
CHEN Xiaoqiang 1. Lanzhou Jiaotong University, Lanzhou 730070, China
2. Key Laboratory of Opto-Technology and Intelligent Control Ministry of Education, Lanzhou Jiaotong University, Lanzhou 730070, China 
CHEN Tao 1. Lanzhou Jiaotong University, Lanzhou 730070, China
2. Key Laboratory of Opto-Technology and Intelligent Control Ministry of Education, Lanzhou Jiaotong University, Lanzhou 730070, China 
LIU Xiaohan 1. Lanzhou Jiaotong University, Lanzhou 730070, China
2. Key Laboratory of Opto-Technology and Intelligent Control Ministry of Education, Lanzhou Jiaotong University, Lanzhou 730070, China 
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Abstract:To improve the harmonic suppression ability of series-connected diode multi-pulse rectifiers in an offshore wind power grid-connected HVDC system, a series-connected 36-pulse rectifier based on a dual passive injection circuit at the DC side is proposed. The rectifier adopts two auxiliary passive injection circuits, which generate voltage injection harmonics after current modulation, and which can double the AC input voltage waveform from 12-step to 36-step. The principle and characteristics of dual passive injection circuits are analyzed in this paper. The input voltage expression at the AC side of the rectifier is derived, and the turn ratio parameters of the injection transformers are designed to minimize the voltage harmonic distortion rate. Finally, the fault-tolerant capability of auxiliary passive circuits with diode open circuit faults is discussed. Theoretical analysis and simulation results show that the proposed rectifier has the advantages of strong harmonic suppression, simple structure, high reliability, and strong robustness, and is more suitable for high-voltage and high-power application. This work is supported by the National Natural Science Foundation of China (No. 51867012 and No. 52067013).
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