三相共补分补跨补一体化电容投切控制策略研究  

Research on Integrated Capacitor Switching Control Strategy of Three-phase,Single-phase and Interphase Compensation

作　　者：张洪涛 ZHANG Hong-tao(Langfang IN-POWER Electric Co.Ltd.,Langfang 065001,China)

机构地区：[1]廊坊英博电气有限公司,河北廊坊065001

出　　处：《电气开关》2023年第2期78-81,95,共5页Electric Switchgear

摘　　要：低压配电网中感性负荷较多,必然需要较大的无功功率,无功功率不仅降低系统的有功传输容量,还会增大线路的损耗。尤其在三相四线制系统中,存在大量的单相负载,其消耗的有功功率和无功功率往往都是三相不平衡的,三相不平衡的功率往往又会产生较大的零线电流,过大的零线电流会使线路发热,绝缘老化,会进一步引起更大的电路故障。为了解决这一问题,除了要补偿正序的无功功率外,还要对不平衡的无功分量和有功分量进行补偿。为此,本文提出了一种基于无源器件动态补偿的方式去同时解决功率因数低且有三相不平衡负荷的问题,并探讨了一种三相共补、分补、跨补一体化电容投切控制策略,具有非常强的现实意义。In low voltage distribution network,there are many inductive loads,which need large reactive power.Reactive power not only reduces the active transmission capacity of the system,but also increases the line loss.Especially in the three-phase four-wire system,there are a large number of single-phase loads,and its consumption of the active power and reactive power are three-phase unbalanced.The three-phase unbalanced power produces a large neutral line current.Excessive neutral line current will cause line heating,insulation aging,and further cause greater circuit failure.In order to solve this problem,in addition to compensating the positive sequence reactive power,the unbalanced reactive power and the active power should be compensated.Therefore,this paper proposes a dynamic compensation method based on passive devices to solve the problem of low power factor and three-phase unbalance,and discusses a integrated capacitor switching control strategy of three-phase co-compensation,single-phase sub-compensation and interphase cross-compensation,which has very high practical value.

关 键 词：电能质量 无功补偿 投切系数 相间跨补 

分 类 号：TM71[电气工程—电力系统及自动化]