电力系统及其自动化学报2025，Vol.37Issue(10)：111-119,9.DOI:10.19635/j.cnki.csu-epsa.001566
三电平柔性转供装置电压均衡和共模抑制协同策略
Three-level Flexible Transfer Device Voltage Balancing and Common-mode Suppression Coordinated Strategy
摘要
Abstract
Aimed at the challenges such as a great number of space vectors,complex common-mode circulation paths and difficulty in DC voltage balancing,which are faced by non-isolated three-level back-to-back flexible power flow transfer devices,a novel method for DC voltage balancing and efficient suppression of common-mode leakage current through the modulation coordination of dual converters is proposed.First,the action characteristics of space vectors in three-level converters are analyzed to quantify their impact on common-mode voltage,so as to formulate an average com-mon-mode voltage suppression method based on the action time of redundant small vectors.Second,the causes of mid-point voltage imbalance on the system's rectification side are discussed,the influence of redundant small vectors on midpoint voltage is analyzed,and a midpoint voltage control method based on the action time of redundant small vectors is put forward accordingly.Furthermore,with the comprehensive consideration of the regulation of action time of small vectors by both the common-mode voltage suppression and midpoint voltage balancing,an optimization allocation is per-formed,thus forming a modulation coordination method for dual converters to achieve DC voltage balancing and high-performance suppression of common-mode leakage current.Finally,the results of comparative simulation experiments validate the effectiveness and superiority of the proposed method.关键词
柔性潮流转供装置/三电平变流器/平均共模电压/中点电位平衡/共模电流Key words
flexible power flow transfer device/three-level converter/average common-mode voltage/midpoint voltage balancing/common-mode current分类
动力与电气工程引用本文复制引用
杨赫,陈昭宇,张金华,徐晶,曹晓军..三电平柔性转供装置电压均衡和共模抑制协同策略[J].电力系统及其自动化学报,2025,37(10):111-119,9.基金项目
国网天津市电力公司科技项目(经研2023-06城镇配电网源荷冲击下的快速电压波动分析与治理技术研究). （经研2023-06城镇配电网源荷冲击下的快速电压波动分析与治理技术研究）
