Journal of South China University of Technology(Natural Science) >

2022 , Vol. 50 >Issue 7: 108 - 117

DOI: https://doi.org/10.12141/j.issn.1000-565X.210810

Power & Electrical Engineering

Commutation Failure Detection Based on Temporal Feature of AC Maximum Current on the Valve-Side

  • Xiaohua LI ,
  • Shanshan YIN ,
  • Jiewen LI ,
  • Zexiang CAI ,
  • Dui LIU ,
  • Zhanpeng TAN
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  • School of Electric Power Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China
李晓华（1975-），女，教授，博士生导师，主要从事电力系统故障分析和继电保护、高压直流输电运行的研 究.

Received date: 2021-12-21

  Online published: 2022-02-21

Supported by

the State Grid Smart Joint Fund Program of China(U1766213);the National Natural Science Foundation of China(51677073)

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Abstract

Commutation failure (CF) is common for the operation of HVDC transmission system, and it reflects the vulnerability of converter. The existing methods for judging CF are subject to influence of fault factors and control adjustments, resulting in the insufficient sensitivity of the methods. Accurate and reliable detection of CF is extremely important to control and protection. Therefore, the paper proposed a detection scheme for CF based on temporal feature of AC maximum current on the valve-side starting from detecting the valve conduction interval. Firstly, the characteristics of AC maximum current was constructed based on the ratio between the unilaterally polarity current of AC current on the converter terminal and the half of the maximum value of the three-phase AC current. Secondly, to reduce the impact of operating conditions, taking the current intersection of two commutating valves currents as the demarcation point, the virtual conducting state of the valve was constructed by using half of the amplitude of the characteristic quantity of AC maximum current, and the accumulated width was calculated by integrating it in a period to determine whether the virtual conducting state of the valve is abnormal.Then, the interlocking relationship between the lengthened and shortened virtual conduction width was used to determine the commutation failure during the commutation process. According to the analysis of power disturbance, fault transiency and the sampling step, the threshold for commutation failure was derived. The recommended threshold value is 1.3 millisecond. Finally, based on the PSCAD / EMTDC electromagnetic transient simulation and wave recorded data, the results show that the proposed detection method is reliable to detect commutation failure. Compared with the detection method based on differential current, the proposed method for detecting commutation failure is less affected by factors, such as operating conditions of AC and DC system, fault moment, and fault severity under different fault conditions. This proposed method can locate the valve of commutation failure and provides more margin for the adjustment of the control system.

Key words： LCC-HVDC; commutation; valve-side current; valve conducting state; temporal feature

Cite this article

Xiaohua LI , Shanshan YIN , Jiewen LI , Zexiang CAI , Dui LIU , Zhanpeng TAN . Commutation Failure Detection Based on Temporal Feature of AC Maximum Current on the Valve-Side[J]. Journal of South China University of Technology(Natural Science), 2022 , 50(7) : 108 -117 . DOI: 10.12141/j.issn.1000-565X.210810

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