| 引用本文: | 吴庆范,付艳,张克辉,等.柔性直流输电系统交流母线差动保护研究[J].电力系统保护与控制,2017,45(3):100-104.[点击复制] |
| WU Qingfan,FU Yan,ZHANG Kehui,et al.Research on AC bus differential protection of flexible DC transmission system[J].Power System Protection and Control,2017,45(3):100-104[点击复制] |
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| 摘要: |
| 梳理了国内已建和在建柔性直流输电工程各种接地方式的拓扑结构，介绍了典型的保护功能配置策略。针对联结变阀侧采用星型电抗经电阻接地方式及其测点配置特点，提出了一种交流母线差动保护方法。该方法通过已有测点计算出虚拟测点的电流值，实现差动保护判据方法的完整和有效。基于工程实际参数，建立了RT_LAB和控制保护系统的闭环仿真试验系统。提出的新方法通过了各种工况下的仿真试验，验证了其可行性和可靠性。 |
| 关键词: 柔性直流输电 拓扑结构 保护方法 仿真试验 可靠性 |
| DOI：10.7667/PSPC160265 |
| 投稿时间：2016-03-03修订日期：2016-05-11 |
| 基金项目:国家电网公司科技项目“±500 kV柔性直流电网超高速保护关键技术研究” |
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| Research on AC bus differential protection of flexible DC transmission system |
| WU Qingfan,FU Yan,ZHANG Kehui,RUAN Siye,HUANG Jinhai,LI Tai,HAO Junfang,FAN Xuefeng |
| (XJ Electric Co., Ltd., Xuchang 461000, China;National Electric Power Dispatching and Control Center, Beijing 100031, China) |
| Abstract: |
| A comprehensive overview about the topology structure of grounding mode in project which have been built and are building in China, the typical protection configuration strategy is described. Then a new AC bus differential protection is proposed against the topological structure and measuring point of delta reactance via resistance grounding mode on valve side of converter transformer. The current of the virtual measuring point is measured based on other measuring point, so the judgement method of AC bus differential protection is complete and effective. The closed-loop simulation test system of RT_LAB and control and protection system is established based on parameters of project. The new judge method proposed have passed comprehensive tests, which verifies its feasibility and reliability. This work is supported by Science and Technology Project of State Grid Corporation of China “Key Techniques Research on ±500 kV Flexible DC Power Grid Utra High-speed Protection”. |
| Key words: flexible DC transmission topological structure protection method simulation test reliability |
