中国电机工程学报2023，Vol.43Issue(24)：9594-9607,中插18,15.DOI:10.13334/j.0258-8013.pcsee.221104
基于有源耦合单元的级联光伏系统直流电压传感器故障穿越策略
A Fault Toleration Strategy for DC Voltage Sensors in Cascaded Photovoltaic Systems Based on Active-coupling Power Units
摘要
Abstract
Cascaded H-bridge(CHB)is a promising topology for utility-scale photovoltaic generation due to its advantages like modularity,scalability,and capability of direct access to medium voltage grids.However,owing to the large quantity of components in the circuit,CHB is less reliable.As one common fault,the DC-link voltage sensor fault will cause the current/voltage mistracking and power mismatch,which will further lead to unbalanced DC-link voltages and even system instability.To address this issue,in this paper,a coupling-dc strategy is proposed to improve the system reliability from the sensor perspective.By deriving the DC voltage self-balancing mode,and selecting the optimal mode combination,a DC-link voltage sensor fault ride-through modulation strategy based on coupled-dc power units is proposed.Finally,an experimental hardware platform is built to verify the proposed techniques.关键词
级联 H 桥光伏系统/功率不匹配/电压自平衡/有源耦合/故障穿越Key words
cascaded H-bridge-photovoltaic/power mismatch/voltage self-balancing/modular multilevel converter/active coupling/fault toleration分类
动力与电气工程引用本文复制引用
汪诚,彭合,华红婷,李磊..基于有源耦合单元的级联光伏系统直流电压传感器故障穿越策略[J].中国电机工程学报,2023,43(24):9594-9607,中插18,15.基金项目
江苏省自然科学基金项目(BK20190461).Project Supported by Natural Science Foundation of Jiangsu Province(BK20190461). （BK20190461）
