摘要
针对750 kV自耦变压器接入电力网后输出端三相电压不平衡的问题,在研究计算单相自耦变压器各绕组间及绕组对地电容的基础上,将计算结果代入对应的给定单相补偿电容表达式,得到含有不平衡系数的补偿电容值;给定不平衡系数的初值和定迭代步长,进行迭代计算;计算收敛判据,决定是否继续迭代,若满足收敛要求则停止迭代,确定补偿相别以及相应的补偿电容值。实例分析结果表明,所提出的新型补偿法能够快速确定出解决自耦变压器低压绕组对地电压不平衡的单相电容补偿方案和补偿电容值,极大提高了现场解决电压不平衡的速度和可靠性,具有广泛的实用性。
For the three-phase voltage unbalance at the output of the single-phase 750 kV autotransformer after it is connected to the power grid,this paper,on the basis of studying and calculating the capacitance between the windings of the single-phase autotransformer and the capacitance between the windings and the ground,substitutes the calculation result into the corresponding single-phase compensation capacitance expression,to obtain the compensation capacitance value with unbalance coefficient.Given the initial value of the unbalance coefficient and the fixed iteration step,the iterative calculation is carried out.The convergence criterion is calculated to decide whether to continue the iteration.If the convergence requirement is met,the iteration is stopped,and the compensation phase and the corresponding compensation capacitance are determined.The results of case analysis show that the new compensation method proposed in this paper can quickly determine the single-phase capacitance compensation scheme and compensation capacitance value as required for the voltage unbalance of the low-voltage winding of the autotransformer.It greatly improves the efficiency and reliability of solving the voltage imbalance on site,and thus has a wide range of practicability.
作者
郭陆
温定筠
张广东
刘康
包艳艳
张时钧
牛欢欢
吴玉硕
GUO Lu;WEN Dingjun;ZHANG Guangdong;LIU Kang;BAO Yanyan;ZHANG Shijun;NIU Huanhuan;WU Yushuo(State Grid Gansu Electric Power Research Institute,Lanzhou 730070,Gansu,China)
出处
《电网与清洁能源》
北大核心
2021年第12期56-63,共8页
Power System and Clean Energy
基金
国家电网有限公司科技项目(SGTYHT/19-JS-215)。
关键词
750kV
自耦变压器
新型补偿方法
单相绕组
对地电压
750 kV
autotransformer
a new compensation method
single-phase winding
grounding voltage
unbalance
