电容器组故障的分布式电流保护方法研究  

Research on Distributed Current Protection Method for the Faults of Capacitor Bank

作　　者：黄云程 沈谢林 张国灿 庄奕挺 林燕强 彭炜文 贺清锋 兰生[2] 曹腾宇 HUANG Yuncheng;SHEN Xielin;ZHANG Guocan;ZHUANG Yiting;LIN Yanqiang;PENG Weiwen;HE Qingfeng;LAN Sheng;CAO Tengyu(State Grid Fujian Electric Power Co.,Ltd.,Quanzhou Power Supply Company,Fujian Quanzhou 362000,China;School of Electric Engineering and Automation Fuzhou University,Fuzhou 350108,China)

机构地区：[1]国网福建省电力有限公司泉州供电公司,福建泉州362000 [2]福州大学电气工程与自动化学院,福州350108

出　　处：《电力电容器与无功补偿》2023年第3期1-7,共7页Power Capacitor & Reactive Power Compensation

基　　金：国网福建省电力有限公司泉州电公司项目(B31330220005)。

摘　　要：针对电容器组三相不平衡保护存在使用范围有限和无法识别对称故障的问题,提出一种电容器组故障的分布式技术保护方法。电容器组某台电容器内部发生短路故障后,若不及时切除,易发生外壳爆裂事故。本文研究利用短路故障发生时的电流暂态峰值与电容器标准中的整定值进行比较,实现各台电容器的分布式保护。本文研究过程中利用PSCAD/EMTDC软件,搭建了18台电容器组模型(单台电容器4串13并结构),对电容器内部元件发生短路故障的状态进行模拟仿真。研究结果表明,电容器内部一个或多个元件故障时,其故障电流峰值基本相同,且投切时系统最大峰值电流小于故障电流峰值,故障电流峰值对电容器组的分布式保护整定值提供了重要参考依据。In view of such problem as limited scope of application of three-phase imbalance protection and no identification of of symmetrical fault of capacitor banks,a kind of distributed technical protection method for capacitor bank faults is proposed.After ocurence of short eircuit fault inside a capacitor in a capacitor bank,if it is not cleared in time,it is likely to have a shell burst.In this paper,the current transient peak at the time of a short-circuit fault is compared with the set value in the capacitor standard to achieve distributed protection of each capacitor.In the process of research in this paper,PSCAD/EMTDC software is used to set up a model of 18 capacitor banks of a single capacitor(four series and thirteen parallel structures),and the simulation of the short-circuit fault state of the internal elements of the capacitor is simulated.The research results show that,in case of fault of one or muliple elements inside the capacitor,its peak fault current is basically identical,and the maximum peak current of the system,in case of switching,is less than the peak fault current,and the peak fault current provides an important reference for the distributed protection setting of the capacitor bank.

关 键 词：电容器组 不平衡保护 分布式保护 短路故障 

分 类 号：TM53[电气工程—电器]