Modified PD modulation strategy for hybrid cascaded multilevel inverters

被引：0
|
作者：
Ye M.-Y. [1 ]
Kang L.-X. [1 ]
Pan T. [1 ]
机构：
[1] School of Electrical and Automation Engineering, East China jiaotong University, Nanchang
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2020年 / 24卷 / 03期
关键词：
Current backflow; Energy feedback; Hybrid cascaded H-bridge multilevel inverter; Logic operation; Modulation strategy;
D O I：
10.15938/j.emc.2020.03.009
中图分类号：
学科分类号：
摘要：
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. © 2020, Harbin University of Science and Technology Publication. All right reserved.
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页码：71 / 78
页数：7
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