电工技术学报2026，Vol.41Issue(2)：622-634,13.DOI:10.19595/j.cnki.1000-6753.tces.250071
一种综合性能优化的两电平并联类交错一体化空间矢量调制策略
A Two-Level Parallel Similar-Interleaved Integrated Space Vector Modulation Strategy with Optimized Comprehensive
摘要
Abstract
Paralleling two three-phase inverters is a straightforward approach to expanding system capacity in high-power power electronics.Interleaved paralleling with carrier phase shift can cancel output current ripples of two inverters,significantly reducing the total harmonic distortion(THD)of grid-connected current and optimizing power quality.However,conventional interleaved systems typically adopt two-level space vector modulation(SVM),which is limited by insufficient vector degrees of freedom and struggles to meet multiple objectives such as common-mode voltage suppression,zero-sequence circulating current optimization,and switching loss reduction.Practical implementations often face issues,including common-mode voltage peaks reaching 1/2 of the DC bus voltage and zero-sequence circulating current Root Mean Square value exceeding the rated current,severely degrading system efficiency and reliability. This paper proposes a similarly interleaved integrated space vector modulation(SISVM)strategy.By leveraging the advantages of vector degrees of freedom,a selection method for three-level vector sequences was established.The method incorporates three key innovations:(1)A multi-objective constrained vector selection framework is established with constraints including the feasibility of interleaved pulse generation,zero-sequence circulating current suppression,common-mode voltage reduction,and efficiency improvement.(2)The first large sector is re-divided into six sub-sectors,and the equivalent three-level vector sequences are accurately screened out with small zero-sequence circulation and low switching losses within each sub-sector.(3)A carrier-phase-shifted equivalent three-level space vector modulation technique is adopted to break through the vector degree-of-freedom limitation of two-level space vector modulation,expanding the degrees of freedom of interleaved paralleling. First,an equivalent three-level system model of paralleled inverters was constructed.This model was used to investigate the effects of different vector sequences on common-mode voltage,zero-sequence circulating current,output current ripple,and switching losses.Accordingly,appropriate vector sequences were selected to optimize performance in each sub-sector.Then,quantitative calculation methods for output current ripple and zero-sequence circulating current in the two-phase stationary coordinate system were presented.The SISVM strategy can reduce zero-sequence circulating current and switching losses more effectively than the conventional TLSVM strategy,particularly under medium-to-high modulation indices. Finally,a parallel system of two 3 kW inverters was built using a DSP+Starsim platform.Comparative experiments were carried out on four modulation strategies:ISVM,AZVPWM,TLSVM,and SISVM.Under different modulation ratios,performance metrics such as common-mode voltage,zero-sequence circulating current,output current THD,system efficiency,and program resource utilization were compared.Results showed that the common-mode voltage can be suppressed within Vdc/6 by the SISVM strategy.Without an additional increase in output current harmonics and hardware resources,the zero-sequence circulating current and switching losses in interleaved parallel modulation can be further reduced by the SISVM strategy.The effectiveness of the SISVM modulation strategy in terms of zero-sequence circulating current and switching losses is further demonstrated.The system's comprehensive performance can be optimized.关键词
交错并联逆变器/共模电压/零序环流/输出电流纹波/开关损耗/类交错/一体化调制Key words
Interleaved parallel inverters/common-mode voltage/zero-sequence circulating current/output current ripple/switching loss/similar interleaved/integrated modulation分类
信息技术与安全科学引用本文复制引用
杜燕,梁晶,蔡志成,杨向真,苏建徽..一种综合性能优化的两电平并联类交错一体化空间矢量调制策略[J].电工技术学报,2026,41(2):622-634,13.基金项目
国家重点研发计划资助项目(2021YFB2601403). （2021YFB2601403）
