引用本文: | 靳维,张栋梁,张洋,等.一种基于阻抗角差对地电容测量方法[J].电力系统保护与控制,2015,43(4):121-125.[点击复制] |
JIN Wei,ZHANG Dongliang,ZHANG Yang,et al.A method of ground capacitance measurement based on impedance angle difference[J].Power System Protection and Control,2015,43(4):121-125[点击复制] |
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摘要: |
对于自动跟踪补偿消弧线圈的控制,主要在于对地电容的准确测量。针对消弧线圈串电阻接地系统,提出了一种根据阻抗角差巧用阻抗三角形的等面积原理,求解系统的对地电容。通过改变消弧线圈的电感值或者改变消弧线圈的串联电阻值,测量调节前、后的零序电流的幅值和相位,据阻抗角差构造等面积三角形,利用求解不平衡电压计算对地参数。使用Matlab建立模型进行计算,表明该方法调节方便、计算简单,满足在线测量的要求。 |
关键词: 对地电容 不平衡电压 阻抗角差 等面积 消弧线圈串电阻 |
DOI:10.7667/j.issn.1674-3415.2015.04.019 |
投稿时间:2014-05-17修订日期:2014-09-02 |
基金项目:国家自然科学基金(51107143) |
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A method of ground capacitance measurement based on impedance angle difference |
JIN Wei,ZHANG Dongliang,ZHANG Yang,LI Xiaobo |
(Xuzhou Runze Electrical Co., Ltd., Xuzhou 221000, China;School of Information and Electrical Engineering,
China University of Mining and Technology, Xuzhou 221008, China) |
Abstract: |
It is important to measure the capacitance to ground accurately for arc-suppression coil’s automatic control. The principle area of impedance triangle based on impedance angle difference is proposed to calculate the system capacitance to ground aimed at coil series resistance grounding system. Triangle is constructed based on impedance angle difference by changing the value of inductance or resistance of arc-suppression coil, measuring the magnitude and phase of zero-sequence current before and after arc-suppression coil regulation. Unbalanced voltage is solved to calculate ground parameters. Matlab simulation results show that the method is easy to adjust and simple to calculate. This method meets the requirements of online measurement. |
Key words: ground capacitance unbalance voltage impedance angle difference area equal arc-suppression coil series resistance |