基于接触器控制的电容电抗器组投切方案  

Research on Switching Scheme of Reactor and Capacitor Bank Based on Contactor Control

作　　者：刘成学 黄棋悦 严楠 LIU Chengxue;HUANG Qiyue;YAN Nan(Cooper(Ningbo)Electric Co.,Ltd.,Ningbo Zhejiang 315300,China;Ningbo Polytechnic,Ningbo Zhejiang 315800,China)

机构地区：[1]库柏(宁波)电气有限公司,浙江宁波315300 [2]宁波职业技术学院,浙江宁波315800

出　　处：《浙江电力》2020年第9期44-49,共6页Zhejiang Electric Power

基　　金：宁波市产业技术创新重大项目(2016B10012);宁波市自然科学基金(2018A610074)。

摘　　要：针对负荷在无功需求时刻变化的情况下,电容电抗器组频繁投切可能引起的断路器处过电压、保护误动作和断路器烧毁等问题,提出一种采用接触器投切电容电抗器组的方案。该方案在电容电抗器组中性点短接回路处加装一组接触器,控制接触器接通或断开中性点三相短接线,进而实现电容电抗器组的投切;替代传统的利用断路器投切的方式,避免过电压对断路器的损害,实现频繁的无功补偿,并保证系统的稳定性。建立PSCAD仿真模型,结果表明:该方案在电力系统正常运行时,能够满足负荷的无功需求;产生投切过电压进而导致接触器发生故障时,不影响电力系统稳定运行。通过经济性分析可知,该方案的投切性价比高于传统方案,具有较高的经济效益。Frequent switching of capacitor and reactor bank may probably cause such problems as overvoltage at the circuit breaker,protection maloperation,circuit breaker burnout with the variations of reactive power demand.This paper presents a novel switching scheme of capacitor and reactor bank based on contactor control:A group of contactors is installed at the short circuit of the neutral point of the capacitor reactor bank,and the control contactor switches on or off the three-phase short circuit of the neutral point to switch the reactor and capacitor bank;instead of the traditional switching by a circuit breaker,this scheme can avoid the damage of overvoltage to the circuit breaker,and thereby can realize frequent reactive power compensation and ensure the stability of the system.The established PSCAD simulation model shows that the scheme can meet the reactive power demand in the normal operation of the power system,and the operation stability of the power system is not influenced in the case of contract fault caused by switching overvoltage.The economic analysis indicates that the scheme is more cost-effective than traditional schemes and gains more economic benefits.

关 键 词：无功补偿 并联电容电抗器 投切过电压 接触器 

分 类 号：TM714[电气工程—电力系统及自动化]