Nonlinear Control Strategy of Dual Active Bridge Converter and DC Solid State Transformer in DC Microgrid

被引：0

作者：

Meng X. ^{[1
]}

Jia Y. ^{[1
]}

Ren C. ^{[1
]}

Han X. ^{[1
]}

Wu H. ^{[1
]}

Zhao P. ^{[1
]}

机构：

[1] Shanxi Key Laboratory of Power System Operation and Control, Taiyuan University of Technology, Taiyuan

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2023年 / 47卷 / 04期

基金：

中国国家自然科学基金;

关键词：

constant power load; DC microgrid; DC solid state transformer (DCSST); disturbance observer; dual active bridge (DAB) converter; large-signal stability; nonlinear control;

D O I：

10.7500/AEPS20220715005

中图分类号：

学科分类号：

摘要：

In DC microgrid, when the dual active bridge (DAB) converter and the DC solid state transformer (DCSST) operate with the constant power load, the stability of the system is adversely affected due to the negative impedance characteristic of the constant power load. This paper proposes a new compound control strategy for the DC converter with constant power load based on the nonlinear disturbance observer and the backstepping control. The Brunovsky's standard types of mathematic models of DAB converter and DCSST are derived. The large-signal nonlinear disturbance estimation method based on the nonlinear disturbance observer is adopted as the feedforward compensation to improve the accuracy of output voltage regulation, and the stability of DAB converter and DCSST under large-signal disturbance is ensured by combining the backstepping control method. The experimental results show that the proposed control method can not only guarantee the stability of DAB converter and DCSST under the large-signal disturbance, but also ensure the fast dynamic response and accurate voltage tracking under different operation conditions. © 2023 Automation of Electric Power Systems Press. All rights reserved.

引用

页码：180 / 189

页数：9

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