Research on Differential Flatness Control Strategy of Y-type Modular Multilevel Converter

被引：0
|
作者：
Cheng Q. [1 ]
Yue B. [1 ]
Cheng Y. [2 ]
Lai Y. [1 ]
Liu K. [1 ]
机构：
[1] Shanghai Key Laboratory Power Station Automation Technology Laboratory, College of Automation Engineering, Shanghai University of Electric Power, Shanghai
[2] North Power Supply Branch, Shanghai Electric Power Company, Shanghai
来源：
Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 08期
基金：
中国国家自然科学基金;
关键词：
differential flattening control; low frequency side current; Lyapunov theory; offshore wind power; power frequency side current; Y-type modular multilevel converter;
D O I：
10.13336/j.1003-6520.hve.20221457
中图分类号：
学科分类号：
摘要：
Y-type modular multilevel converter (Y-MMC) is a kind of three-phase AC-AC converter with high power, low cost and high voltage characteristics, which can be applied to the field of offshore wind power. At present, the low frequency and power frequency current of Y-MMC are generally controlled by PI strategy, whereas the control effect of PI strategy for Y-MMC is not ideal. Therefore, a differential flatness control strategy of Y-MMC low frequency side and power frequency side current is proposed to solve this problem. Firstly, the decoupling model of Y-MMC is derived according to its topological structure. Then, the mathematical expressions of positive- and negative-order PI control strategy and positive-and negative-order differential flatness control strategy are derived, and the global asymptotic stability is proved by the Lyapunov theory. Finally, the simulation and experimental results on Matlab/Simulink simulation platform and RT-LAB semi-physical platform show that the proposed differential flatness control method(strategy) is correct and effective. © 2023 Science Press. All rights reserved.
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页码：3467 / 3480
页数：13
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