Control Strategy of Modular Multilevel Matrix Converter Under Unbalanced Grid Conditions

被引：0
|
作者：
Cheng Q. [1 ]
Xie Y. [1 ]
Ma X. [1 ]
Ye P. [1 ]
Zhou Y. [1 ]
Fu W. [1 ]
机构：
[1] College of Automation Engineering, Shanghai University of Electric Power, Shanghai Key Laboratory Power Station Automation Technology Laboratory, Shanghai
来源：
Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 05期
基金：
中国国家自然科学基金;
关键词：
double; αβ0; transformation; modular multilevel matrix converter; offshore wind power generation; passivity-based control; PI control; unbalanced grid;
D O I：
10.13336/j.1003-6520.hve.20212050
中图分类号：
学科分类号：
摘要：
To reduce transmission line losses, low frequency AC transmission system emerges under the background of offshore wind power generation,and it directly realizes AC/AC conversion from low frequency to power frequency through modular multilevel matrix converter (M3C). The control strategy of an AC/AC system based on M3C is studied in this paper in case of asymmetric faults. The circuit structure and working principle of M3C are analyzed primarily. Then, the positive- and negative-sequence separation of the voltage and current is carried out in view of the asymmetry of system fault. Next, on the strength of the mathematical model of M3C system after the double αβ0 transformation and the passivity of the input side and the output side system, the passivity-based control laws of input side and output side are deduced, and the bridge arm capacitor voltage is controlled by adjusting the circulating current. Ultimately, on an experimental platform, the proposed PBC control strategy of M3C both sides under an unbalanced power grid is tested under two different working conditions. The validity and availability of the proposed strategy are certified by the experimental results. © 2023 Science Press. All rights reserved.
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页码：1975 / 1984
页数：9
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