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Publication Title | Study of Microturbine Models in Islanded and Grid-Connected Mode

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Journal of Energy and Power Engineering 5 (2011) 862-869

Study of Microturbine Models in Islanded and Grid-Connected Mode

A.K. Saha

School of Electrical, Electronic and Computer Engineering, University of KwaZulu-Natal, Durban 4041, South Africa

Received: January 03, 2011 / Accepted: February 23, 2011 / Published: September 30, 2011.

Abstract: Modeling and simulation of two different microturbine (MT) models to analyze load following performance as distributed energy resource (DER) have been presented in this paper. The first model consists of speed governor, acceleration control, and temperature control blocks while the other is GAST model. The system comprises a synchronous generator and a MT coupled to it. Simulations are carried out in islanded and grid-connected mode to observe the system response when supplying variable loads. The load following characteristics is observed and validated for this MT-synchronous generator model in Matlab-Simulink environment. This is applicable with combined heat power (CHP) generators both with general fuel as well as bio-fuels. The use of bio-fuels is very much promising for generating green power preventing green house gas emissions for fighting against global warming.

Key words: Distributed energy resources, microturbine, synchronous generator, speed control, recuperator.

1. Introduction

Presently, DERs have been receiving significant attention as a means to improve the performance of the electrical power system, provide low cost energy, and increase overall energy efficiency [1]. DERs consist of variety of small, modular distributed generation (DG) technologies that can be combined with energy management and storage systems. DER devices enable efficient utilization of renewable energies and waste heat in combined heat and power (CHP) applications as well as lowering emissions [2]. Recent technology improvements in various types of DERs which include MTs, fuel cells, mini-hydro, battery storage, and so on, have created the opportunity for large-scale integration of DERs into distribution systems. To address increasing power demand and power quality requirements, given the current electric utility restructuring and public environmental regulations, such on-site supply may be the most practical approach [3].

Corresponding author: A.K. Saha, senior lecturer, research fields: power systems, distributed energy resources, renewable energy resources, load forecasting, demand side management, facts devices, smart grid. E-mail: saha@ukzn.ac.za.

MTs are small and simple-cycle gas turbines with outputs ranging typically from around 25 to 300 kW. They are part of a general evolution of conventional gas turbine technology. Techniques incorporated into the larger machines, to improve the performance, can typically be found in MTs as well. These include recuperation, low NOx emission technologies and the use of advanced materials, such as ceramic for the hot section parts [4, 5]. Unlike traditional backup generators, MTs are designed to operate for extended periods of time and require little maintenance. They can supply a customer’s base-load requirements or can be used for standby, peak shaving and cogeneration applications. In additions, the current generation MTs has the following specifications [6, 7]:

• Relatively smaller in size, compared to other distributed resources.

• High fuel-to-electricity conversion efficiency, which can reach 25%-30%. However, if the waste heat recovery is used, combined heat and electric power could achieve energy efficiency levels greater than 80%.

• Environmental superiority, NOx emissions lower

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