| 摘要: |
| 高压直流开路试验是高压直流工程的一项重要试验，准确的原理分析及开路电压的计算是十分必要的。从换流阀的基本模型入手，详细分析了不带直流线路和带直流线路的开路试验中换流阀的导通情况，建立了开路电压可定量计算的等效电路。通过列写换流阀开通时等效电路的微分方程，建立换流阀关断时的拉氏变换电路，对不带直流线路和带直流线路工况下的开路电压进行解析计算，并阐述开路电压建立的基本过程和物理本质。最后，在PSCAD/EMTDC软件中利用CIGRE高压直流标准测试模型验证了所提公式的准确性。 |
| 关键词: 电力系统 高压直流输电 换流阀 开路试验 缓冲电路 开路电压 |
| DOI：10.16081/j.epae.202111023 |
| 分类号:TM721.1 |
| 基金项目: |
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| Analytical calculation of open line voltage for HVDC transmission system |
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YU Jingqiu, XU Zheng
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College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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| Abstract: |
| OLT(Open Line Test) is an important test in HVDC(High Voltage Direct Current) engineering, the accurate analysis of principles and calculation of open line voltage are very necessary. Based on the basic model of converter valves, their conduction situations with and without DC lines are respectively analyzed in detail. Besides, the equivalent circuit for quantitative calculation of open line voltage is established. The differential equations of equivalent circuit when the converter valve is triggered on are listed. And Laplace transformation circuit when the converter valve is turned off is performed. The open line voltages with and without DC lines are calculated analytically, and the basic process and physical essence of the establishment of open line voltage are described. Finally, the CIGRE HVDC standard test model is adopted in PSCAD/EMTDC software to verify the accuracy of the proposed formulas. |
| Key words: electric power systems HVDC power transmission converter valves open line test snubber circuit open line voltage |
