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commutation failure mitigation Method Based on Imaginary commutation Process

Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1413-1422页

作者： Renlong Zhu Xiaoping Zhou Haitao Xia Lerong Hong Hanhang Yin Lingfeng Deng Yifeng Liu College of Electrical and Information Engineering Hunan UniversityChangsha 410082China

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.

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

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A commutation failure Prediction and mitigation Method

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Journal of Modern Power Systems and Clean Energy 2022年第3期10卷 779-787页

作者： Renlong Zhu Xiaoping Zhou Haitao Xia Lerong Hong Hanhang Yin College of Electrical and Information Engineering Hunan UniversityChangsha 410082China

The mitigation of commutation failure(CF)depends on the accuracy of CF *** terms of the large error of the existing extinction angle(EA)calculation during the fault transient period,a method for CF prediction and mitigation is *** in both DC current and overlap angle(OA)are considered in the proposed method to predict the EA *** addition,variations in critical EA and the effect of firing angle(FA)on both DC current and OA are considered in the proposed method to obtain the accurate FA order for the control *** proposed method can achieve good performance in terms of CF mitigation and reduce reactive consumption at the inverter side when a fault *** results based on the PSCAD/EMTDC show that the proposed method predicts CF rapidly and exhibits good performance in terms of CF mitigation.

关键词： commutation failure prediction commutation failure mitigation line commutated converter based high-voltage direct current(LCC-HVDC) extinction angle(EA) overlap angle(OA) firing angle(FA)

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维普期刊数据库

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Improved Identification Method and Fault Current Limiting Strategy for commutation failure in LCC-HVDC

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1761-1772页

作者： Jian Liu Sheng Lin Wenliang Zhong Lei Liu School of Electrical Engineering Southwest Jiaotong UniversityChengdu 610031China State Grid Sichuan Electric Power Research Institute Chengdu 610072China

Line-commutated converter based high-voltage direct-current(LCC-HVDC)transmission systems are prone to subsequent commutation failure(SCF),which consequently leads to the forced blocking of HVDC links,affecting the operation of the power *** accurate commutation failure(CF)identification is fairly vital to the prevention of ***,the existing CF identification methods cause CF misjudge or detection lag,which can limit the effect of SCF mitigation *** addition,earlier approaches to suppress SCF do not clarify the key factor that determines the evolution of extinction angle during system recovery and neglect the ***,this paper firstly analyzes the normal commutation process and CF feature based on the evolution topology of converter valve conduction in ***,the energy in the leakage inductance of converter transformer is presented to characterize the commutation state of the *** a CF identification method is proposed utilizing the leakage inductance ***,taking the key variable which is crucial to the tendency of extinction angle during the recovery process into account,a fault current limiting strategy for SCF mitigation is put *** with the original methods,the proposed methods have a better performance in CF identification and mitigation in terms of detection accuracy and mitigation ***,case study on PSCAD/EMTDC validates the proposed methods.

关键词： Line commutated converter based high-voltage direct current(LCC-HVDC)transmission commutation failure identification commutation failure mitigation HVDC transmission control

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