Study on Steady and Transient Operating Characteristics of Capacitors in VSC-HVDC Transmission System

CAI Linglong; WANG Tingting; YI Chengqian; MA Zhiqin; LIU Gang; LIAO Zihao; YAO Cheng; LI Qian; HU Taishan

doi:10.14044/j.1674-1757.pcrpc.2025.06.005

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Study on Steady and Transient Operating Characteristics of Capacitors in VSC-HVDC Transmission System

POWER CAPACITOR & REACTIVE POWER COMPENSATION | Capacitor

Study on Steady and Transient Operating Characteristics of Capacitors in VSC-HVDC Transmission System
柔性直流输电系统电容器稳态及暂态运行特性研究
Electric Power Research Institute of Guangdong Power Grid Co.，Ltd.，Guangzhou 510080，China
Guangdong
Key Laboratory of Electric Power Equipment Reliability Enterprises，Guangzhou 510080，China
Vol. 46, Issue 6, Pages: 33-40(2025)
DOI：10.14044/j.1674-1757.pcrpc.2025.06.005
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CAI Linglong, WANG Tingting, YI Chengqian, et al. Study on Steady and Transient Operating Characteristics of Capacitors in VSC-HVDC Transmission System[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(6): 33-40.
DOI：

CAI Linglong, WANG Tingting, YI Chengqian, et al. Study on Steady and Transient Operating Characteristics of Capacitors in VSC-HVDC Transmission System[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(6): 33-40. DOI： 10.14044/j.1674-1757.pcrpc.2025.06.005.

摘要

柔直电容器的可靠性直接影响换流阀运行可靠性，需要对其稳态与暂态运行特性开展研究，为柔直电容器的全工况等效试验提供依据。本文以乌东德工程系统实际参数为输入，搭建包含真实子模块的柔直系统电磁暂态仿真模型，分析了柔直电容器稳态及暂态运行特性。仿真结果表明，稳态工况下柔直电容器上承受由直流偏置的阶梯状交流电压，与是否有负投状态无关；稳态工况下柔直电容器上电流为工频交流电流与冲击电流的叠加，当无负投状态时，电容上仅存在正向冲击电流，当有负投状态时，电容上同时存在正向及负向冲击电流；暂态工况下高阀组换流变阀侧单相接地故障下柔直电容器的电流峰值最大，低阀组换流变阀侧单相接地故障下电容器的瞬时电压峰值最大。

Abstract

The reliability of VSC-HVDC DC capacitors directly affects operation reliability of the converter valve. It is necessary to study their steady and transient operating characteristics so to provide a basis for the full-condition equivalent test of theVSC-HVDC DCcapacitors. In this paper the actual parameters of the Wudongde project system is taken as an input，an electromagnetic transient simulation model of VSCHVDC DC system containing real sub-modules is set up，and the steady and transient operating characteristics of theVSC-HVDC DCcapacitors is analyzed. The simulation results show that under steady conditions，theVSC-HVDC DCcapacitors are subjected to a step-shaped AC voltage biased by DC，regardless of whether there is a negative switching condition. Under steady conditions，the current on the VSC-HVDC DC capacitors is a superposition of the power frequency AC current and the impulse current. In case of no negative switching，only a positive impulse current is existed on the capacitors. While，in case negative switching，both positive and negative impulse currents are existed on the capacitors. Under transient condition，the peak of current of theVSC-HVDC DCcapacitors is the highest under a single-phase grounding fault on the valve side of high valve group converter transformer，and the peak of transient voltage of the capacitors is the highest under a single-phase grounding fault on the valve side of low valve group converter transformer.

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