考虑三段式线路保护主保护范围的电网故障诊断解析模型  

Analytical Model of Power Grid Fault Diagnosis Considering Main Protection Range of Three-section Line Protection

作　　者：刘道兵[1] 郭营营 李世春[1] 鲍妙生 齐越 李珏岑 LIU Daobing;GUO Yingying;LI Shichun;BAO Miaosheng;QI Yue;LI Juecen(College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443000,Hubei Province,China)

机构地区：[1]三峡大学电气与新能源学院,湖北省宜昌市443000

出　　处：《电网技术》2023年第5期1905-1911,共7页Power System Technology

基　　金：国家自然科学基金项目(51907104)。

摘　　要：当电力系统中的线路发生故障时,如果线路主保护没有发生动作,则会被认为拒动,系统将付出主保护拒动的代价。为避免主保护被认为拒动的情况,准确判断主保护的动作,提出了一种考虑三段式线路保护主保护范围的电力系统故障诊断解析模型。该模型依据线路首末两端主保护的保护范围,将线路分成3部分,并对这3部分的保护动作逻辑表达式进行细化描述,再与母线和变压器的解析模型相结合建立完整的电力系统故障诊断解析模型。并利用改进后的粒子群优化算法(particle swarm optimization,PSO)对电网中实际的故障案例进行仿真验证,证明该模型能够有效地解决线路主保护被认为拒动的情况,且实现了对电力系统故障的准确诊断。When the line fails in the power system and the main protection does not act,it calls this situation miss-operation.The system will pay the price for the main protection’s refusal.This paper proposes an analytical model considering the main protection range of the three-stage line protection,avoiding the above situation and accurately judge the action of the main protection.The model divides the line into three parts and refines the logical expressions of the protection actions of these three parts based on range of the main protection at the both ends of the line.Then a complete analytical model is described combined with the model of bus and transformer.Using to simulate and verify the actual fault cases in the power grid by the improved particle swarm optimization(PSO)algorithm.This paper proves that the model is able solve the problem effectively the problem as well as realizes the accurate diagnosis of the power system faults.

关 键 词：线路 主保护 保护范围 故障诊断 解析模型 

分 类 号：TM721[电气工程—电力系统及自动化]