Grid-connected current control for MMC–MG adopting nonlinear passive theory

被引：2

作者：

Wang X.-G. ^{[1
]}

Wang H.-L. ^{[1
]}

Xue S. ^{[1
]}

Li X.-Y. ^{[1
]}

机构：

[1] School of Electrical Engineering and Information Engineering, Lanzhou University of Technology, Gansu, Lanzhou

来源：

Kongzhi Lilun Yu Yingyong/Control Theory and Applications | 2022年 / 39卷 / 08期

基金：

中国国家自然科学基金;

关键词：

current control; dynamic performance; microgrids; passivity-based control; PI control;

D O I：

10.7641/CTA.2021.10616

中图分类号：

学科分类号：

摘要：

Aiming at the poor dynamic performance of traditional PI control method in grid-connected current control of the modular multilevel converter microgrids, a current control strategy adopting passive control theory is proposed. Firstly, the topological structure of the system is described, and its Euler-Lagrange mathematical model is established. Then, the passive control law is obtained by selecting the state variables of the system, setting the error energy function and the damping term to be injected. And the passivity-based current controller is designed on the passive control law. In addition, the optimal damping parameters are obtained by observing the stability, current harmonic characteristics, amplitude-frequency and phase-frequency characteristic curve of the controller with different damping values. Finally, the effectiveness of the proposed passivity-based current control is validated with simulations using grid-connected models of the system. The results show that the passivity-based control method of damping injection can quickly track the current and power reference values under different operating conditions compared with the traditional PI control. And it has good harmonic characteristics and stability. © 2022 South China University of Technology. All rights reserved.

引用

页码：1541 / 1550

页数：9

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