Commutation Failure Mitigation Method Based on Imaginary Commutation Process

作     者：Renlong Zhu Xiaoping Zhou Haitao Xia Lerong Hong Hanhang Yin Lingfeng Deng Yifeng Liu Renlong Zhu;Xiaoping Zhou;Haitao Xia;Lerong Hong;Hanhang Yin;Lingfeng Deng;Yifeng Liu

作者机构：College of Electrical and Information EngineeringHunan UniversityChangsha 410082China 

出 版 物：《Journal of Modern Power Systems and Clean Energy》 (现代电力系统与清洁能源学报（英文）)

年 卷 期：2022年第10卷第5期

页      面：1413-1422页

核心收录：

学科分类：0808[工学-电气工程] 080802[工学-电力系统及其自动化] 08[工学] 

基　　金：supported by the Science and Technology Innovation Major Project of Hunan Province (No. 2020GK1010) the Innovation Young Talents Program of Changsha Science and Technology Bureau (No. kq2107005) the Postgraduate Scientific Research Innovation Project of Hunan Province (No.QL20210101) 

主　　题：Commutation failure(CF) commutation failure mitigation extinction angle line commutated converter based high-voltage direct current(LCC-HVDC) 

摘      要：The commutation failure(CF) mitigation effectiveness is normally restricted by the delay of extinction angle(EA)measurement or the errors of existing prediction methods for EA or firing angle(FA). For this purpose, this paper proposes a CF mitigation method based on the imaginary commutation process. For each sample point, an imaginary commutation process is constructed to simulate the actual commutation ***, the imaginary EA is calculated by comparing the imaginary supply voltage-time area and the imaginary demand voltage-time area, which can update the imaginary EA earlier than the measured EA. In addition, the proposed method considers the impacts of commutation voltage variation, DC current variation, and phase angle shift of commutation voltage on the commutation process, which can ensure a more accurate EA calculation. Moreover, the DC current prediction is proposed to improve the CF mitigation performance under the single-phase AC faults. Finally, the simulation results based on CIGRE model prove that the proposed method has a good performance in CF mitigation.