DC voltage balance strategy for cascaded H-bridge rectifier based on load current feedforward

被引：0
|
作者：
Yuan Y. [1 ]
Mao K. [1 ]
机构：
[1] School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2019年 / 39卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Cascaded H-bridge rectifier; Compensation; Current feedforward; DC voltage balance; Dynamic characteristics;
D O I：
10.16081/j.issn.1006-6047.2019.06.005
中图分类号：
学科分类号：
摘要：
As for the output voltage balance problem of cascaded H-bridge rectifier, the proportional pulse compensation method is employed for modeling and analyzing. Then, the influence of load current disturbance on the balance link is analyzed, and the relationship curves among voltage drop value, adjustment time and dynamic indexes under disturbances are given. As for the bad dynamic characteristics of proportional pulse compensation method in large-scale load switching, a load current feedforward voltage balance control strategy based on proportional pulse compensation is proposed, which introduces the load current into the balance control link. It can greatly improve the dynamic characteristics of the balance controller without affecting the stability of the original closed-loop system, and the designing formula of parameters for the voltage balance PI controller is given. Finally, the simulation model and experimental prototype based on cascaded H-bridge rectifier are compared and tested, and the results show that the maximum voltage difference between the units is reduced by 23 V and the adjustment time is reduced by 75% under load shedding. © 2019, Electric Power Automation Equipment Press. All right reserved.
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页码：33 / 38and53
页数：3820
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