摘要
目的:为了解决配电网台区侧负载不平衡引起的变压器三相电流不平衡现象,利用储能变流器投入补偿负荷的不平衡电流,从而保证台区变压器处于三相平衡工作状态。方法:研究了一种储能变流器,采用正负序分离算法对不平衡电流进行分解,补偿电流的负序与零序分量,利用PI控制和准PR控制将分解后的电流分序进行控制,最后经过SPWM调制进行输出给定电流。结果:储能变流器监测负荷电流,计算并得到三相不平衡电流给定值,储能变流器按给定电流输出,变压器输出电流保持三相平衡。结论:提出的电流分序控制策略可以有效补偿三相电流不平衡,故储能变流器可用于台区变压器输出不平衡问题的治理。
Aims:In order to solve the three-phase current imbalance phenomenon caused by the unbalanced load in station area,the energy storage converter was used to compensate the unbalanced current of the load.Methods:An energy storage converter was studied.It decomposed the unbalanced current to compensate the negative and zero sequence components of the current by using the positive and negative sequence separation algorithm,controlled the decomposed current by using PI control and quasi-PR control,and finally gave the output of the given current through the SPWM modulation.Results:The energy storage converter monitored the load current,calculated and obtained the given value of the three-phase unbalance current.The energy storage converter gave the output according to the given current;and the transformer output current maintained the three-phase balance.Conclusions:The current sequence control strategy can effectively compensate the three-phase current imbalance;and the energy storage converter can be used to solve the output imbalance problem of the transformer in the station area.
作者
于潇涵
陈卫民
陈天成
YU Xiaohan;CHEN Weimin;CHEN Tiancheng(College of Information Engineering,China Jiliang University,Hangzhou 310018,China)
出处
《中国计量大学学报》
2022年第4期539-545,共7页
Journal of China University of Metrology
基金
浙江省基础公益研究计划项目(No.LGG20E070003)。
关键词
储能变流器
三相不平衡
正负序分离
准PR控制器
power conversion system
three-phase unbalance
positive and negative sequence separation
quasi-PR controller
