Control strategy of modular multilevel converter based on arm current direct control

被引：0
|
作者：
Xin Y. [1 ]
Wang W. [1 ]
Li G. [1 ]
Wang C. [1 ]
Jiang S. [1 ]
机构：
[1] School of Electrical Engineering, Northeast Electric Power University, Jilin
来源：
| 2018年 / Electric Power Automation Equipment Press卷 / 38期
关键词：
Arm current control; Circulating cur-rent; Dq transform; Flexible HVDC power transmission; Modular multilevel converter;
D O I：
10.16081/j.issn.1006-6047.2018.10.018
中图分类号：
学科分类号：
摘要：
A control strategy of modular multilevel converter based on arm current direct control is proposed to control the AC current, DC current and arm circulating current. Through the theoretical analysis, the relationship between the transmission power of the upper/lower arm and the arm current is obtained. The inner-and outer-loop control system is designed to control the upper/lower arm independently. Respectively, the current of three-phase upper/lower arm is transformed into dq coordinate system, and the command values of each phase current of the upper/lower arm are obtained. Then, the arm circulating current suppressor is used to realize active/reactive power closed-loop control of the converter. The control strategy is validated on the 31-level flexible HVDC power transmission physical experiment platform. The results show that the proposed control method has the advantages of high accuracy and high efficiency suppression of arm circulating current in the converter. © 2018, Electric Power Automation Equipment Press. All right reserved.
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页码：115 / 120
页数：5
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