DOI:10.35833/MPCE.2021.000611 |
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Commutation Failure Mitigation Method Based on Imaginary Commutation Process |
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Net amount: 336 |
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Author:
Zhu Renlong, Zhou Xiaoping, Xia Haitao, Hong Lerong, Yin Hanhang, Deng Lingfeng, Liu Yifeng
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Author Affiliation:
College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
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Foundation: |
This work was 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), and the Postgraduate Scientific Research Innovation Project of Hunan Province (No. QL20210101). |
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Abstract: |
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 process. Then, 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. |
Keywords: |
Commutation failure (CF) ; commutation failure mitigation ; extinction angle ; line commutated converter based high-voltage direct current (LCC-HVDC). |
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Received:September 05, 2021
Online Time:2022/09/24 |
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