摘要
混合级联H桥多电平逆变器拓扑结构在采用常用的混合调制策略进行控制时存在电流倒灌和能量反馈的问题,在部分调制比区间内甚至会出现高压单元输出功率回馈到低压单元的现象,当低压单元直流侧电压由不控整流桥提供时会使得直流母线电容电压上升。为解决该问题,文中提出一种基于改进载波层叠调制的控制方法,其中,高压H桥单元采用方波与三角载波相结合的方法,低压H桥单元采用改进PD调制的方法,对混合频率下所得脉冲进行了重新的逻辑运算与组合,该方法既能解决电流倒灌和能量回馈的问题,还能使两单元之间的输出功率分配也得到了改善。最后进行了仿真和实验结果验证。
The hybrid cascaded H-bridge multilevel inverter topology has the problems of current backflow and energy feedback when it is controlled by a common hybrid modulation strategy. In some modulation ratios,the output power of the high-voltage unit may even be fed back to the low-voltage unit. when the DC side voltage of the low-voltage unit is provided by the uncontrolled rectifier bridge,the DC bus capacitor voltage will rise. In order to avoid this problem,a method of modified carrier phase disposition modulation strategy is proposed. Among them,the high-voltage H-bridge unit adopted a method of combining a square wave and a triangular carrier,and the low-voltage H-bridge unit adopted an improved PD modulation method,which re-calculated and combined the pulses obtained at the mixed frequency. This method can solve the problems of current backflow and energy feedback,and can also improve the output power distribution between the two units. Finally,simulation and experimental results were verified.
作者
叶满园
康力璇
潘涛
YE Man-yuan;KANG Li-xuan;PAN Tao(School of Electrical and Automation Engineering,Easl China jiaotong University,Nanchang 330013,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2020年第3期71-78,共8页
Electric Machines and Control
基金
国家自然科学基金(51767007)
江西省教育厅自然科学基金(GJJ180306)
江西省自然科学基金(20192BAB206036)
江西省科技支撑项目(20192BBEL50011)。
关键词
混合级联H桥多电平逆变器
调制策略
电流倒灌
能量回馈
逻辑运算
hybrid cascaded H-bridge multilevel inverter
modulation strategy
current backflow
energy feedback
logic operation
