摘要
电力系统中的非线性负荷会引起交流正弦波畸变产生各次谐波,对电能计量的准确性及继电保护的可靠性产生严重影响。针对新一代站对电子式电流互感器谐波计量及继电保护的更高要求,研究了罗氏线圈的传感原理和传变特性,并根据其数学模型,分析了影响罗氏线圈频率响应特性的两个主要因素为线圈内阻和分布电容,再结合外积分电路的结构参数模型,分析了积分时间常数对罗氏线圈电流互感器整体频率响应特性的影响。最后通过Multism12.0仿真电路模型,模拟了罗氏线圈电流互感器在2~13次谐波电流下的频率响应输出,并进行了试验验证。仿真与试验结果表明,罗氏线圈电流互感器能够满足电力系统关于谐波功率计量的0.2级准确度要求,能够可靠测量电网中的谐波分量。
The nonlinear load in power system will distort AC sine wave to generate harmonics,which severely affect the accuracy of energy metering and reliability of relay protection. To meet higher requirements of harmonic metering and relay protection for the new generation intelligent substation, this study analyzes the working principle and transfer characteristics of Rogowski coil. According to the mathematical model of Rogowski coil, two main factors affecting the frequency response characteristics of the coil, i.e., the coil’s internal resistance and distributed capacitance,are studied. The structural parameter model of external integral circuit is employed to analyze the influence of integral time constant on the frequency response characteristics of the current transformer with Rogowski coil. In addition,through Multism12.0 simulation circuit model,the frequency response characteristics of the current transformer under from second-order to 13 th-order harmonics are simulated,and experiment is conducted for verification. Results show that the current transformer with Rogowski coil can meet the requirements of power system for 0.2 grade accuracy of harmonic power measurement,and it can reliably measure harmonic components of power grid.
作者
申狄秋
朱明东
王旭峰
胡蓓
王靓
卢雯兴
SHEN Diqiu;ZHU Mingdong;WANG Xufeng;HU Bei;WANG Liang;LU Wenxing(China Southern Power Grid EHV Transmission Company,Guangxi Liuzhou 545006,China;XJ Electric Co.,Ltd., Henan Xuehang 461000,China;China Southern Power Grid EHV Transmission Company,Guangzhou 510620,China;China Electric Power Research Institute,Wuhan 430074,China)
出处
《高压电器》
CAS
CSCD
北大核心
2018年第6期170-176,共7页
High Voltage Apparatus
关键词
谐波计量
罗氏线圈电流互感器
频率响应特性
harmony measurement
current transformer with Rogowski coil
frequency response characteristics
作者简介
申狄秋(1979-),男,硕士,高级工程师,主要从事变电自动化系统、智能电网技术和计量技术研究工作;朱明东(1989-),男,硕士,工程师,主要从事电子式互感器的研发和设计工作;王旭峰(1978-),男,学士,高级工程师,主要从事电力通信及计量相关技术工作;胡蓓(1986-),男,硕士,工程师,主要从事电子式互感器相关技术;王靓(1985-),男,学士,高级工程师,主要从事变电自动化系统相关研究工作;卢雯兴(1988-),男,学士,工程师,主要从事自动控制相关技术工作。
