电源学报2025，Vol.23Issue(7)：36-44,9.DOI:10.13234/j.issn.2095-2805.2025.7.36
高调制深度下三电平NPC逆变器中点电位快速均衡控制
Fast Neutral-point Potential Balancing Control of Three-level NPC Inverter Under High Modulation Depth
摘要
Abstract
To solve the problem of uncontrollable area of bus neutral-point potential under high modulation depth of conventional virtual space vector pulse-width modulation(VSVPWM),an optimized VSVPWM algorithm was proposed to realize the rapid balance of neutral-point potential in the whole linear modulation area.A virtual medium vector was reconstructed based on the principle of VSVPWM bus neutral-point potential balancing.To ensure the voltage equalization performance of the reconstructed virtual medium vector while improving the adaptability of the algorithm with respect to the perturbation of system parameters,the fuzzy reasoning for the closed-loop control of neutral-point potential was designed to determine the reconstruction factor for optimizing the VSVPWM.Even in the case of asymmetric DC bus capacitance,the optimized VSVPWM can realize rapid voltage equalization control in the full range of the linear modulation region.The algorithm was further simplified in a 60° coordinate system,so that the number of subsector judgment conditions of reference voltage vector and volt-second equilibrium equations can be reduced from 30 to 5.Experimental results show that the proposed control strategy has good performance,the voltage equalization regulation time is significantly reduced,and the steady-state deviation of DC bus neutral-point potential can be controlled within 1.14％.In addition,the total harmonic distortion of grid-connected current is lower compared with that under the conventional VSVPWM.关键词
三电平NPC逆变器/中点电位均衡/虚拟中矢量/重构因子/模糊推理Key words
Three-level NPC inverter/neutral-point potential balancing/virtual medium vector/reconstruction factor/fuzzy reasoning分类
信息技术与安全科学引用本文复制引用
杨清,黄景涛,关海平,蒋广旭,刘帅..高调制深度下三电平NPC逆变器中点电位快速均衡控制[J].电源学报,2025,23(7):36-44,9.基金项目
国家自然科学基金资助项目(U1504617) （U1504617）
教育部产学合作协同育人项目(202101222007)This work is supported by National Natural Science Foundation of China under the grant U1504617 （202101222007）
Industry-university Cooper-ative Education Program of the Ministry of Education under the grant 202101222007 （）
