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

Reza Pejmanfar, Mahmoud Reza Haghifam, Soodabeh Soleymani and Babak Tavassoli
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Reza Pejmanfar: Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran 14778-93855, Iran
Mahmoud Reza Haghifam: Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran 14115-111, Iran
Soodabeh Soleymani: Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran 14778-93855, Iran
Babak Tavassoli: Department of Electrical and Computer Engineering, K.N. Toosi University of Technology, Tehran 16317-14191, Iran

Energies, 2017, vol. 10, issue 12, 1-25

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.

Keywords: hybrid micro-grid; robust control; adaptive control; sliding mode; stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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