高电压技术2024，Vol.50Issue(3)：1235-1243,9.DOI:10.13336/j.1003-6520.hve.20221024
单相PET级联整流SVPWM均压边界及拓展方法
Voltage Balancing Boundary and Extension Method of SVPWM for Single-phase Cascaded Rectifier Based on PET
摘要
Abstract
Power electronic transformer is an important interface device for connecting AC/DC power distribution sys-tems in the renewable energy generation grid.However,the DC voltage of the front-stage single-phase cascaded H-bridge rectifier will deviate because of the back-stage unbalanced load.In this paper,the voltage balancing boundary based on the optimal vector selection strategy is derived to solve the problem that space vector pulse width modulation(SVPWM)fails to balance the voltage.According to the relationships between the load unbalance index boundary and the number of cascade cells,modulation index,and power factors,a control strategy is proposed.The voltage balancing capability can be improved by changing the modulation index or power factors.Therefore,to ensure stable operation under severe un-balanced load conditions,a wider voltage balancing range is established by changing the DC voltage reference or reducing power factors.The balancing boundary and the effectiveness of the proposed expansion method,which guaran-tees equalization under extremely unbalanced conditions,are verified by simulation and experimental results with a three-cell cascaded rectifier.关键词
电力电子变压器/单相级联H桥整流器/直流电压均衡/均压边界/负载不平衡限制边界Key words
power electronic transformer/single-phase cascaded H-bridge rectifier/DC voltage balance/voltage bal-ancing boundary/boundary of load unbalance index引用本文复制引用
王顺,马兰,朱磊磊,杨帆,谢锡锋,舒泽亮..单相PET级联整流SVPWM均压边界及拓展方法[J].高电压技术,2024,50(3):1235-1243,9.基金项目
国家自然科学基金(52077183) （52077183）
广西高等学校高水平创新团队及卓越学者计划(桂教人才[2020]6 号). Project supported by National Natural Science Foundation of China(52077183),High Level Innovation Team and Distinguished Scholar Pro-gram of Guangxi Higher Education Institutions(Grant Guangxi Teach Talent[2020]No.6). （桂教人才[2020]6 号）
