河南理工大学学报（自然科学版）2024，Vol.43Issue(1)：113-123,11.DOI:10.16186/j.cnki.1673-9787.2022010084
单相级联型多电平变换器直流纹波电压分析及抑制策略
Analysis and suppression strategy of DC ripple voltage of single-phase cascaded multilevel converter
摘要
Abstract
Cascaded H bridge type multilevel converter using phase shift transformer and rectifier power sup-ply with the advantages of high power factor,low harmonic content of output voltage has been widely used in high-power industrial fields.The traditional modulation algorithms are based on the assumption that the DC bus voltage is a constant value.However,the low-frequency ripples appeared on the DC side are modu-lated and transmitted to the load,resulting in the distortion of the output voltage waveform.Objective To ex-plore the problem that a large amount of DC ripple voltage exists on the power supply side of cascade H-bridge unit,resulting in waveform distortion of output load voltage,Methods the DC ripple voltage was firstly analyzed by using the double Fourier theory in this paper,and then a DC ripple feedforward compen-sation strategy was introduced.By measuring the actual input voltage of the DC side of each cascaded H-bridge divided by the voltage reference value and multiplied by the traditional carrier signal,the carrier phase shift modulation was carried out with the modulation voltage.At the same time,the reactive voltage was simulated by FFT transformation with vector control,and faster convergence speed,higher stability and smaller oscillation were obtained.Results The simulation and experimental results verified that the proposed modulation algorithm and control strategy could effectively suppress the low-order harmonics in the load voltage,reduce the waveform distortion of the output voltage,and realize the fast dynamic response and no steady-state error control of the inverter power supply.Conclusion The experimental results verified the fea-sibility and rationality of the modulation strategy and control strategy used above.关键词
级联H桥/直流纹波/前馈补偿/载波移相调制/矢量控制Key words
cascaded H-bridge/DC ripple/feedforward compensation/carrier phase-shift modulation/vector control分类
信息技术与安全科学引用本文复制引用
陶海军,肖群星,张金生,郑征,杨明,黄涛..单相级联型多电平变换器直流纹波电压分析及抑制策略[J].河南理工大学学报（自然科学版）,2024,43(1):113-123,11.基金项目
国家自然科学基金资助项目(U1804143) （U1804143）
河南省科技攻关计划项目(222102220014) （222102220014）
河南省高校基本科研业务费专项资金资助项目(NSFRF210409) （NSFRF210409）
