Mixed H2/H∞ Robust Controller Design and Simultaneous use of Virtual Inertia for Stability Improvement of Micro-grids

Authors

1 Department of Electrical Engineering, Collage of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

2 Department of Electrical Engineering, Razi University, Kermanshah, Iran

3 Department of Electrical Engineering, Kermanshah University of Technology, Kermanshah, Iran

Abstract

In this paper, to improve the stability of a micro-grid in islanding mode, that contains two wind and gas DG units, simultaneous use of virtual inertia and robust controller is proposed. The use of the variable speed wind turbine and the Doubly-Fed Induction Generator (DFIG) reduces the system inertia and thereby decreases the dynamic stability. Implementation of virtual inertia in DFIG improves the power system stability. However, the change or uncertainty of the system parameters is a major challenge that must be considered when using the virtual inertia. In this paper, the implementation of virtual inertia in DFIG control system is described in detail and the impact of uncertainty and change of the control system parameters over performance of the frequency control system is investigated. In order to improve the dynamic and the steady state performance of the frequency control system, benefiting from the impact of virtual inertia, the mixed H2/H∞ robust controller is proposed. The simulation results using MATLAB show that the proposed hybrid controller guarantees the system stability in conditions of uncertainty and change of the control system parameters.

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