含分布式光伏T接线的配电网距离保护计算  

Distance Protection Calculation in Distribution Network with T-connected Distributed Photovoltaic

作　　者：黄荣泽 HUANG Rongze(Dispatching Control Center of Baise New Aluminum Power Co.,Ltd.,Guangxi Baise 533000,China)

机构地区：[1]百色新铝电力有限公司调度中心,广西百色533000

出　　处：《广西电力》2023年第3期59-65,共7页Guangxi Electric Power

摘　　要：含逆变器的分布式光伏电源T型接入配电网后造成距离保护测量阻抗受到附加阻抗影响可能导致传统距离保护拒动、误动。首先推导分布式光伏T接后测量阻抗和附加阻抗的表达式,分析附加阻抗导致距离保护不正确动作的原因,然后提出利用附加阻抗角在复平面内计算测量阻抗的计算方法,消除附加阻抗对距离保护的影响。最后在Simulink平台环境下进行仿真验证,结果表明该方法有效解决传统距离保护拒动或者误动的问题,提高配电网的运行的可靠性。After distributed photovoltaic power sources with inverters are connected to distribution network by T-type connection,measurement impedances of distance protection are affected by additional impedance,which may cause the rejection or malfunction of traditional distance protection.Firstly,the expressions for measurement impedance and additional impedance after the T-connection of distributed photovoltaic are derived,and the reasons for incorrect operation of distance protection caused by additional impedance are analyzed.Then,a calculation method for calculating and measuring impedance in the complex plane using an additional impedance angle is proposed to eliminate the influence of additional impedance on distance protection.Finally,the method is verified by simulations on the Simulink platform environment,and the results show that the method effectively solves the problem of traditional distance protection rejection or malfunction,and improves the reliability of distribution network operation.

关 键 词：距离保护 短路附加阻抗 测量阻抗 分布式光伏 配电网T型接线 

分 类 号：TM773[电气工程—电力系统及自动化]