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Publication Title | Performance Evaluation of Fuel Cell and Microturbine as Distributed Generators in a Microgrid

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European Journal of Scientific Research

ISSN 1450-216X Vol.30 No.4 (2009), pp.554-570 © EuroJournals Publishing, Inc. 2009 http://www.eurojournals.com/ejsr.htm

Performance Evaluation of Fuel Cell and Microturbine as Distributed Generators in a Microgrid

Azah Mohamed

Department of Electrical, Electronic and Systems Engineering Universiti Kebangsaan Malaysia, Selangor, Malaysia E-mail: azah@eng.ukm.my

Tel: 60389216006

Muhammad Nizam

Department of Electrical, Electronic and Systems Engineering Universiti Kebangsaan Malaysia, Selangor, Malaysia

A.A. Salam

Department of Electrical, Electronic and Systems Engineering Universiti Kebangsaan Malaysia, Selangor, Malaysia

Abstract

This paper presents dynamic models of distributed generators (DG) and investigates dynamic behaviour of the DG units within a microgrid system. The DG units include micro turbine, fuel cell and the electronically interfaced sources. The voltage source converter is adopted as the electronic interface which is equipped with its controller to maintain stability of the microgrid during small signal dynamics. This paper also introduces power management strategies and implements the DG load sharing concept to maintain the microgrid operation in standalone, grid-connected and islanding modes of operation. The results demonstrate the operation and performance of the microturbine and SOFC as distributed generators in a microgrid.

Keywords: Microgrid,DistributedGeneration,Microturbine,FuelCell

1. Introduction

The deregulated power grid and energy environment has favored a gradual transition from centralized power generation requiring long transmission and distribution facilities to distributed generations (DG) (Pepermans,2005). An increase in the number of DG connections and high depth of penetration can give rise to several technical concerns in the operation of the power system. To overcome this problem, a microgrid is formed when multiple DG units in electrical proximity to each other are grouped together in a distribution system. The DG units in a microgrid may comprise of several technologies, namely, diesel engines, micro turbines and fuel cells, photovoltaics and wind turbines. The capacity of the DG sources varies from few kWs to 1-2 MWs. The coordinated operation and control of DG sources together with storage devices, such as flywheels, energy capacitors, batteries, and controllable loads are central to the concept of microgrids.

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