Commutation Failure Mitigation Method Based on Imaginary Commutation Process

Renlong Zhu

doi:10.35833/MPCE.2021.000611

Commutation Failure Mitigation Method Based on Imaginary Commutation Process

2022-01-01

13

OA

AI

朱仁龙 (Renlong Zhu)

周

周小平 (Xiaoping Zhou) *

DOI：10.35833/MPCE.2021.000611

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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 vari-ation, 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.

Keyword:

HVDC transmission

Firing

Current measurement

Phase locked loops

Technological innovation

Inverters

Delays

Commutation failure (CF)

commutation failure mitigation

extinction angle

line commutated converter based high-voltage direct current (LCC-HVDC)

Commutation Failure Mitigation Method Based on Imaginary Commutation Process

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