基于熄弧后主谐振频率的系统电容电流测量方法误差分析  

Error Analysis of System Capacitance Current Measuring Method Based on Main Resonant Frequency After Arc Extinction

作　　者：张帆[1] 薛永端[1] 徐丙垠[2] ZHANG Fan;XUE Yongduan;XU Bingyin(College of New Energy,China University of Petroleum(East China),Qingdao 266580,China;College of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东省青岛市266580 [2]山东理工大学电气与电子工程学院,山东省淄博市255000

出　　处：《电力系统自动化》2023年第2期164-172,共9页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52077221)。

摘　　要：在谐振接地系统中,系统电容电流的精确测量是接地故障消弧及保护的基础,测量方法的误差分析就显得至关重要。针对利用熄弧后暂态信息的谐振接地系统电容电流测量方法,研究发现影响该测量方法误差的主要因素为消弧线圈电流和熄弧后暂态过程主谐振频率测量精度,通过双变量线性规划的图解法分析了主谐振频率测量误差,用于校验系统电容电流的测量结果是否满足相关标准和规程要求。结果表明,考虑到谐振接地系统的规模与现场运行情况,建议主谐振频率测量允许误差统一取0.100 Hz。通过建模仿真验证了该误差分析方法的有效性,同时该方法也适用于不同系统失谐度和不同过渡电阻的情况,具有较强的可迁移性。In a resonant grounded system, the accurate measurement of the system capacitance current is the basis of grounding fault arc suppression and protection. Therefore, the error analysis of the measurement method is very important. Aiming at the method of measuring the capacitance current of the resonant grounded system based on the transient information after the arc extinction, this paper studies the main factors including the current of the arc-suppression coil and the main resonant frequency after the arc extinction of the transient process which influence the measuring method, and analyzes the measurement error of the main resonant frequency via the graphical method of bivariate linear optimization, which is used to verify whether the measurement result of the system capacitance current meets the requirements of relevant standards and regulations. The results show that,considering the size of the resonant grounded system and on-site operation situation, the allowed measurement error of the main resonant frequency is recommended to take 0.100 Hz uniformly. The effectiveness of the error analysis method is verified through modeling simulation, and the method is also suitable for different system detuning degrees and different transition resistances,which has strong portability.

关 键 词：谐振接地系统 系统电容电流 接地故障 主谐振频率 测量误差 

分 类 号：TM862[电气工程—高电压与绝缘技术]