采用孤岛检测优化策略的SiC双向PCS设计
SiC Bidirectional PCS with Optimized Strategy of Islanding Detection
卢英杰 1毛行奎 1陈奇1
作者信息
- 1. 福州大学电气工程与自动化学院,福建 福州 350108
- 折叠
摘要
目前,高电压和高频率已成为双向储能变流器(PCS)的发展趋势,因此碳化硅(SiC)器件的应用在双向PCS中越来越广泛.为了在中小功率双向PCS中实现孤岛保护,针对频率扰动法在检测过程中导致并网谐波增大的问题,采用T型三电平拓扑,基于线电压的DSOGI锁相环,以及并网电流正负序分离控制策略设计PCS.同时,提出一种孤岛检测优化策略,有效减少并网电流谐波含量,并可以在规定时间内检测出孤岛效应而进行保护.最后完成1台双向PCS样机,验证了优化控制策略正确有效.
Abstract
At present,high voltage and high frequency have become the development trend of bidirectional power conversion systems(PCS).Therefore,the application of silicon carbide(SiC)devices in bidirectional energy storage converters is becoming more and more extensive.In order to achieve islanding protection in small and medium-power bidirectional PCS,and address the issue of increased grid connected hamonics caused by the frequency disturbance method during dectecting,a T-type three-level topology,a DSOGI phase-locked loop based on line voltage,and a grid connected current positive and negative sequence separation control strategy were adopted to design PCS.At the same time,an optimizied strategy for islanding detection was proposed,which can effectively reduce the harmonic content of grid connected current and can detect the islanding effects within the specified time for protection.Finally,a bidirectional PCS prototype was completed,which was verified that the optimal control strategy was correct and effective.
关键词
双向储能变流器/T型三电平逆变电路/碳化硅/孤岛检测Key words
bidirectional power conversion system(PCS)/T-type three-level inverter circuit/silicon carbide(SiC)/islanding detection引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据