| 引用本文: | 李斌,邱宏,洪潮,张野,杨健.基于电压源型换流器的柔性直流系统快速方向保护[J].电力自动化设备,2018,(2): |
| LI Bin,QIU Hong,HONG Chao,ZHANG Ye,YANG Jian.High-speed direction protection of flexible DC system based on voltage source converter[J].Electric Power Automation Equipment,2018,(2): |
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| 摘要: |
| 基于电压源型换流器的直流配电系统发生故障时，故障电流具有速度快、峰值大的特点，对保护速动性与可靠性要求高。针对典型环状直流配电系统，研究了保护正、反方向发生故障时的差异特征。在此基础上，提取直流侧并联电容电压与线路电流在保护正、反方向发生故障时的相关性特征，提出并设计了一种直流线路快速方向保护新原理。该原理具有动作速度快、选择性高、抗过渡电阻能力较强等特点。在PSCAD中搭建了四端环状直流配电系统，大量仿真算例验证了所提保护原理的可行性与优越性。 |
| 关键词: 直流配电系统 电压源型换流器 相关性 方向判据 纵联保护 |
| DOI：10.16081/j.issn.1006-6047.2018.02.001 |
| 分类号:TM773 |
| 基金项目:国家优秀青年科学基金资助项目(51422703)；南方电网重点科技项目(CSGTRC-K163001) |
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| High-speed direction protection of flexible DC system based on voltage source converter |
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LI Bin1, QIU Hong1, HONG Chao2, ZHANG Ye2, YANG Jian2
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1.Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China;2.Electric Power Research Institute of CSG, Guangzhou 510663, China
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| Abstract: |
| When faults occur in the VSC(Voltage Source Converter)-based DC distribution system, the fault currents have fast speed and high peak value, which require high quickness and reliability of protection. Aiming at the typical meshed VSC-based DC distribution system, the discriminative features between positive and reverse direction fault of protection are analyzed. On this basis, a new fast direction protection principle of DC lines is proposed, by extracting correlation characteristics of DC side parallel capacitor voltage and line current with the positive and reverse direction faults of protection. The principle has the characteristics of fast action speed, high selectivity and strong resistance to transition resistance. A four-terminal meshed DC distribution system is built in PSCAD, whose simulation examples verify the feasibility and superiority of the proposed protection principle. |
| Key words: DC distribution system voltage source converter correlation directional criterion pilot protection |
