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π型接线高压电容器组不平衡电流离线测试方法

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国内交、直流滤波器电容器组一般采用H桥型结构,但某些换流站采用π型结构电容器组,H桥型电容器组不平衡电流离线测试方法不再适用.本文提出将π型结构电容器组构成H桥型间接测量不平衡电流的新方法,分别对电阻、电容和电感3种构成H桥的方法进行计算公式推导和仿真分析.为减小现场电磁干扰对测量精度的影响,本文采用多频率点测试不平衡电流的方法进行现场测试,结果表明新方法理论思路正确,可以准确测量不平衡电流.
Off-line Test Method for Unbalanced Current of High Voltage Capacitor Bank as π Type Structure
AC and DC filter capacitor banks in China generally use H-bridge structure,but some converter stations use π-type structure capacitor banks,and the off-line test method for unbalanced current of H-bridge capacitor banks is not applicable any longer. In this paper,a new method of indirectly measuring unbalanced current is proposed by forming a π-type capacitor bank into an H bridge. And the method de-rives the calculation formula and simulates such three methods of forming the H bridge as resistance,capac-itance and inductance. For reducing the influence of on-site electromagnetic interference on the measure-ment accuracy,the method of testing unbalanced current at multiple frequency points is used for on-site test-ing. The results show that the theoretical idea of the new method is correct and can accurately measure un-balanced current.

capacitor bank as π type structureresistor bridge armunbalanced current

雷战斐、史磊、耿池勇、吴鹏

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国网宁夏电力有限公司超高压公司,银川 750011

国网宁夏电力有限公司,银川 750011

深圳市恒东电气有限公司,广东 深圳 518116

π型电容器组 电阻桥臂 不平衡电流

宁夏回族自治区自然科学基金(2021)

2021AAC03495

2024

电力电容器与无功补偿
西安电力电容器研究所

电力电容器与无功补偿

影响因子:0.99
ISSN:1674-1757
年,卷(期):2024.45(2)
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