66 kV谐振接地系统中性点位移电压影响因素及仿真分析  

Influence Factors and Simulation Analysis of Neutral-point Displacement Voltage at 66 kV Resonant Grounding System

作　　者：李赫 李博文 成龙[2] 王振浩[2] LI He;LI Bowen;CHENG Long;WANG Zhenhao(Tongliao Power Supply Company,State Grid East Inner Mongolia Electric Power Company,Inner Mongolia Tongliao 028000,China;School of Electrical Engineering,Northeast Electric Power University,Jilin Jilin 132012,China)

机构地区：[1]国网内蒙古东部电力有限公司通辽供电公司,内蒙古通辽028000 [2]东北电力大学电气工程学院,吉林吉林132012

出　　处：《电力电容器与无功补偿》2019年第4期94-100,共7页Power Capacitor & Reactive Power Compensation

基　　金：国网内蒙古东部电力有限公司项目(SGMDTL00FCJS1800748)

摘　　要：66 kV谐振接地系统三相电压不平衡导致中性点位移电压现象日益突出,影响了设备的安全运行并增加了线路损耗。为计算非对称排列的单回和同塔双回架空线路对地电容参数,引入电位系数矩阵和电容矩阵来表示导线自身参数以及导线间的耦合关系,使计算结果更加接近实际。详细分析线路等效电感与电容构成的电压谐振电路在不对称电压的作用下,其中性点位移电压的产生机理。根据某实际66 kV谐振接地系统和现场运行数据,建立基于Matlab/Simulink仿真平台的详细等效模型,验证中性点位移电压与线路不对称度、系统失谐度的数值关系。The circumstance of neutral?point displacement voltage due to imbalance of three?phase voltage in 66 kV resonant grounding system is more and more remarkble,which affects the safe operation of the equipment and increases the line loss.For calculating the capacitance parameters of the single and double?loop overhead line on the same tower with asymmetric arrangement,the potential coefficient matrix and ca?pacitance matrix are introduced to represent the parameters of the line itself and the coupling relationship between the lines so to keep the calculation result more close to the practical parameters.The generating mechanism of neutral?point displacement voltage of voltage resonance circuit consisting of equivalent in?ductance and capacitance under action of asymmetrical voltage is analyzed in detail.The detailed equiva?lent model based on Matlab/Simulink platform is set up in accordance with actual 66 kV resonant ground?ing system and field operation data,and the numerical relationship among neutral?point displacement volt?age,line asymmetry and system detuning degree is verified.

关 键 词：66kV谐振接地系统 不对称分布参数 中性点位移电压 建模仿真 

分 类 号：TM7[电气工程—电力系统及自动化]