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Mathematical Problems in Engineering
Volume 2017 (2017), Article ID 8962086, 9 pages
https://doi.org/10.1155/2017/8962086
Research Article

Adaptive Sliding-Mode Control in Bus Voltage for an Islanded DC Microgrid

Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Correspondence should be addressed to Dan Zhang; moc.621@5891gnahzelocin

Received 4 May 2017; Accepted 27 November 2017; Published 24 December 2017

Academic Editor: Oscar Reinoso

Copyright © 2017 Dan Zhang and Jie Wang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The control of bus voltage is a crucial task for the stable operation of islanded DC microgrids. To improve the DC bus voltage control dynamics and stability, this paper proposes an adaptive sliding-mode control method based on large-signal model. The sliding-mode control, adaptive observation, and fix-frequency pulse width modulation technology are adopted and combined efficiently, which guarantee stable bus voltage and the constant switching frequency of closed-loop system, regardless of how the parameters vary with the variable constant-power loads and uncertainties. In addition, the reference values can be quickly tracked by the state variables using the proposed method without any additional sensors/hardware circuits. Therefore, this method is beneficial for the scalability and plug-play of the distributed generators and loads within the DC microgrids. The performance of the proposed control method has been successfully verified in simulation.