电源学报2025，Vol.23Issue(2)：86-95,10.DOI:10.13234/j.issn.2095-2805.2025.2.86
飞跨电容钳位型三电平变换器飞跨电容电压移相控制策略研究
Research on Phase-shifting Control Strategy of Flying Capacitor Voltage for Flying Capacitor Clamped Three-level Converter
米慧瑶 1宋磊 1刘潇奎 1段善旭1
作者信息
- 1. 强电磁技术全国重点实验室(华中科技大学电气与电子工程学院),武汉 430074
- 折叠
摘要
Abstract
The flying capacitor clamped three-level converter has many advantages,e.g.,it can reduce the voltage stress of a switch and the volume of a filter inductor.Under its operation,it is necessary to stabilize the flying capacitor voltage at half of the high-voltage side voltage,so a control strategy of adjusting the duty cycle is often used.However,this method has the problem of coupling control between flying capacitor voltage and output voltage,resulting significant fluctuations of inductance current in the process of flying capacitor voltage regulation.To solve this problem,the advantages of using the phase-shifting control strategy to realize the decoupling control of flying capacitor voltage and output volt-age are analyzed,and the corresponding control characteristics are also studied.Through the establishment of a harmonic model of flying capacitor voltage,the relationship between flying capacitor voltage and phase-shifting angle is given.A low-order harmonic function relationship is constructed,which indicates that the flying capacitor voltage is affected by the switch duty cycle D and phase-shifting angle Δφ.The effective duty cycle interval of phase-shifting control and the duty cycle that optimizes the performance of phase-shifting control are delimited by combining with a time-domain model.A simulation model was established,and an experimental prototype with 3.6 kW was built.The control strategies of adjusting flying capacitor voltage based on phase-shifting angle and duty cycle are compared to verify the decoupling advantages and control characteristics of phase-shifting control.关键词
飞跨电容/移相控制/解耦控制/有效区间Key words
Flying capacitor/phase-shifting control/decoupling control/effective interval分类
信息技术与安全科学引用本文复制引用
米慧瑶,宋磊,刘潇奎,段善旭..飞跨电容钳位型三电平变换器飞跨电容电压移相控制策略研究[J].电源学报,2025,23(2):86-95,10.
