基于离散整定值的配电系统快速电流保护算法  

A Fast Current Protection Algorithm for Power Distribution Systems Based on Discrete Setting⁃value

作　　者：张军 宫旻 周宜 谢俊娥 曹磊 刘盈盈 ZHANG Jun;GONG Min;ZHOU Yi;XIE June;CAO Lei;LIU Yingying(State Grid Hubei Electric Power Co.,Ltd.Shennongjia Power Supply Company,Shennongjia 442400,Hubei,China)

机构地区：[1]国网湖北电力有限公司神农架供电公司,湖北神农架442400

出　　处：《电气传动》2024年第8期48-56,76,共10页Electric Drive

基　　金：国家自然科学基金(52167010)。

摘　　要：传统的电流保护使用电流的有效值与整定值进行比较以识别故障,这是配电系统输电线路的典型保护方案。通过快速傅里叶变换(FFT)算法计算电流。由于电流有效值的计算需要很长时间,电流速断保护的速度降低。针对这一问题,提出了一种基于离散整定值的快速电流保护算法。重点介绍了整定值离散序列和保护判据的构造。通过对电流故障分量整定值和采样值离散序列的比较,建立了保护启动判据和动作判据。分析了快速电流保护的工作特性和可靠性。通过基于PSCAD/EMTDC的仿真,将新型快速电流保护算法的性能与传统电流保护算法进行了比较。结果表明,该快速电流保护算法在不同故障条件下具有良好的运行特性。In traditional current protection,the effective value of current is compared with the setting value to identify the fault which is the typical protection scheme for the transmission lines of the power distribution systems.The current is calculated by the fast Fourier transform algorithm.As the calculation of the effective value of current requires a long time,the speed of the current quick break protection is reduced.In this regard,a fast current protection algorithm based on the discrete setting-value was presented to solve this problem.The main emphasis was placed on the construction of the discrete sequence of setting-value and the protection criterion.The protection startup criterion and action criterion were constructed based on comparisons between discrete sequence of settingvalue and sampling-value of the current fault component.The operation characteristics and reliability of the fast current protection were analyzed.The performance of the novel fast current protection algorithm was compared with that of the conventional current protection through simulations based on PSCAD/EMTDC.The results verify that the novel fast current protection algorithm has good operation characteristics under different fault conditions.

关 键 词：配电系统 快速电流保护 离散整定值 电流故障分量 

分 类 号：TM28[一般工业技术—材料科学与工程]