Analysis and Protection of Single-phase-to-ground Fault on Valve Side of Interface Transformer in VSC-HVDC System with Symmetrical Monopolar Configuration
Application Research|更新时间:2025-06-16
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Analysis and Protection of Single-phase-to-ground Fault on Valve Side of Interface Transformer in VSC-HVDC System with Symmetrical Monopolar Configuration
Automation of Electric Power SystemsVol. 44, Issue 21, Pages: 116-122(2020)
作者机构:
国网经济技术研究院有限公司,北京市 102209
作者简介:
基金信息:
National Key R&D Program of China;State Grid Cooperation of China
MEI Nian,YUAN Bin,YUE Bo,et al.Analysis and Protection of Single-phase-to-ground Fault on Valve Side of Interface Transformer in VSC-HVDC System with Symmetrical Monopolar Configuration[J].Automation of Electric Power Systems,2020,44(21):116-122.
MEI Nian,YUAN Bin,YUE Bo,et al.Analysis and Protection of Single-phase-to-ground Fault on Valve Side of Interface Transformer in VSC-HVDC System with Symmetrical Monopolar Configuration[J].Automation of Electric Power Systems,2020,44(21):116-122. DOI: 10.7500/AEPS20200209004.
Analysis and Protection of Single-phase-to-ground Fault on Valve Side of Interface Transformer in VSC-HVDC System with Symmetrical Monopolar Configuration
Voltage source converter based high voltage direct current (VSC-HVDC) project is developed towards high voltage and large capacity in recent years. However
the withstand voltage and current levels of the corresponding main equipment cannot rise linearly. Thus
it is urgent to carry out analytical analysis on the fault mechanism and reduce the transient stress requirements of the main equipment through the accurate coordination of the faults and protections. Taking the single-phase-to-ground (SPG) fault on the valve side of the interface transformer as an example
the analytical expressions of sequence components of the voltage/current and the measured values of the voltage/current at typical measurement locations in VSC-HVDC system after the fault are given
followed by the analysis on the fault mechanism. On this basis
the problems of the differential protection applied to detect the SPG fault on the valve side of the interface transformer in VSC-HVDC system with symmetrical monopolar configuration are presented. According to the configuration modes of the interface transformers
the zero-sequence overvoltage protection and the neutral-point overcurrent protection on the valve side of the interface transformer are suggested as the main protections to detect the SPG fault. With the electromagnetic transient simulation of a real VSC-HVDC project
the validity of the fault mechanism analytical studies and the adaptability of the protections are verified.
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