交流特高压线路高抗补偿度上限  

Upper Limit of Compensation Degree of High Voltage Shunt Reactor for UHVAC Transmission Lines

作　　者：易强[1] 周浩[1] 计荣荣[1] 苏菲[1] 孙可[2] 陈稼苗[3] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]浙江省电力公司,浙江省杭州市310007 [3]浙江省电力设计院,浙江省杭州市310012

出　　处：《电网技术》2011年第7期6-18,共13页Power System Technology

基　　金：国家重点基础研究发展计划项目(973项目)(2011CB209405)~~

摘　　要：为避免因高抗补偿度过高而产生的非全相运行谐振过电压,分析了单、双回特高压线路非全相运行谐振过电压的产生机理,给出了从避免产生谐振过电压角度确定高抗补偿度上限的方法。结果表明,线路参数对高抗补偿度上限的影响很小,且单、双回线路的高抗补偿度上限非常接近。在目前线路设计水平和设备制造水平下,在系统频率不低于48Hz的条件下,当高抗补偿度设计值不超过90%时,可确保不产生具有危险性的高幅值非全相运行谐振过电压,故一般可将90%作为高抗补偿度的设计上限;而当高抗补偿度小于85%时,肯定不会发生谐振。作为研究的基础,深入分析了高抗中性点接地电抗的阻抗值偏差、系统频率偏差以及高抗补偿容量偏差对产生非全相运行谐振的条件的影响。To avoid the resonance overvoltage under open-phase operation of UHVAC transmission line, which is caused by exorbitant compensation of high voltage （HV） shunt reactor, the producing mechanism of resonance overvoltage of single-circuit and double-circuit of UHVAC transmission lines under open-phase operation is analyzed, and a method to determine the upper limit of compensation degree of HV shunt reactor in the standpoint of evading resonance overvoltage is given. Calculation results show that the parameters of UHVAC transmission lines have little influence on the upper limit and the upper limits of single-circuit and double-circuit UHVAC transmission lines are very close. In the level of current transmission line design and equipment manufacture and under the condition that power system frequency is not lower than 48Hz, it can be ensured that the resonance overvoltage under open-phase operation, which possesses dangerous amplitude, will not occur while the designed value of HV shunt reactor does not exceed 90%, thus in general the index 90% can be taken as the upper limit of the designed value of compensation degree of HV shunt reactor; when the designed value of compensation degree of HV shunt reactor is lower than 85%, the resonance will not occur for certain. As the foundation of above-mentioned research, the influences of impedance value deviation of grounding reactor connected to the neutral of HV shunt reactor, power system frequency deviation and capacity deviation of HV shunt reactor on the condition to result in the resonance under open-phase operation of single-circuit and double-circuit UHVAC transmission lines are analyzed in depth.

关 键 词：特高压输电线路 单回路 双回路 高抗补偿度 上限 非全相运行 谐振过电压 中性点接地电抗 

分 类 号：TM715[电气工程—电力系统及自动化]