电源学报2024，Vol.22Issue(z1)：50-58,9.DOI:10.13234/j.issn.2095-2805.2024.S1.50
三电平逆变器中点电位偏移机理分析与平衡方法研究
Analysis of Neutral-point Potential Shift Mechanism and Balance Method for Three-level Inverter
摘要
Abstract
Aimed at the problem of neutral-point potential balance control of three-level neutral-point clamped inverters,the cause of neutral-point fluctuation of a T-type three-level inverter was analyzed.Based on the non-harmonic injection and dynamic harmonic injection methods,the period Fourier series of the third-order harmonic of neutral-point current was derived and analyzed.First,an open-loop harmonic injection algorithm was derived,and a closed-loop harmonic injection algorithm based on proportional-resonance controller was proposed accordingly to suppress the neural-point current.Then,MATLAB/Simulink simulation software was used to simulate the open-loop harmonic injection and closed-loop harmonic injection algorithms,and a 40 kW three-level inverter was built for experimental verification.Both the simulation and experimental results can verify the correctness of theoretical analysis and the effectiveness of the proposed control strategy.关键词
三电平逆变器/中点电位/比例谐振控制Key words
Three-level inverter/neutral-point potential/proportional-resonance control分类
信息技术与安全科学引用本文复制引用
耿后来,高宁,吴卫民..三电平逆变器中点电位偏移机理分析与平衡方法研究[J].电源学报,2024,22(z1):50-58,9.基金项目
国家自然科学基金面上资助项目(51877130)This work is supported by National Natural Science Foundation of China under the grant 51877130 （51877130）
