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Energies 2017, 10(12), 1985; doi:10.3390/en10121985

Large Signal Stabilization of Hybrid AC/DC Micro-Grids Using Nonlinear Robust Controller

1
Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran 14778-93855, Iran
2
Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran 14115-111, Iran
3
Department of Electrical and Computer Engineering, K.N. Toosi University of Technology, Tehran 16317-14191, Iran
*
Author to whom correspondence should be addressed.
Academic Editor: Chunhua Liu
Received: 13 August 2017 / Revised: 15 October 2017 / Accepted: 25 October 2017 / Published: 1 December 2017

Abstract

This paper presents a robust nonlinear integrated controller to improve stability of hybrid AC/DC micro-grids under islanding mode. The proposed controller includes two independent controllers where each one is responsible to control one part of the system. First controller will improve the stability of input DC/DC converter. Using this controller, the voltage of DC bus is fully stabilized such that when a large disturbance occurs, its voltage will become constant without any significant dynamic. The necessity of DC bus regulation which has not been considered in previous studies, is imminent as it not only improves voltage stability of the micro-grid but also protects consumers which are directly connected to the DC bus, against voltage variations. Frequency stability of the micro-grid is provided by the second proposed controller which is applied to output DC/AC converter of the micro-grid. Adaptive method is used to make the controllers proposed in this paper, robust. Duty cycle of converters switches are adjusted such that voltage and frequency of the micro-grid are set on the desired value in minimum possible time under transient disturbances and uncertainty of the loads as well as micro-sources characteristics. View Full-Text
Keywords: hybrid micro-grid; robust control; adaptive control; sliding mode; stability hybrid micro-grid; robust control; adaptive control; sliding mode; stability
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Pejmanfar, R.; Haghifam, M.R.; Soleymani, S.; Tavassoli, B. Large Signal Stabilization of Hybrid AC/DC Micro-Grids Using Nonlinear Robust Controller. Energies 2017, 10, 1985.

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