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Publication Title | Modelling and Simulation of Microturbine in Islanded and Grid-connected Mode as Distributed Energy Resource

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Modelling and Simulation of Microturbine in

Islanded and Grid-connected Mode as

Distributed Energy Resource

A.K.Saha, Non-member, S.Chowdhury, Member IEEE, S.P.Chowdhury, Member IEEE and P.A.Crossley, Senior Member IEEE

1

Abstract- This paper presents modeling and simulation of microturbine (MT) to analyze its load following performance as distributed energy resource (DER) with general as well as critical priority loads. The system comprises of a synchronous generator and a MT coupled to it. Simulations are carried out in islanded and grid-connected mode of the system to observe its behavior when supplying customer’s variable loads. It also incorporates modeling and simulation of microturbine with a speed control system of the MT-synchronous generator to keep the speed constant with load variation. The load following characteristics is observed and validated for this MT-synchronous generator model in Matlab-Simulink environment with power system block sets. 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. But it may take some time to be in the market place for its commercial use.

Index Terms- Microturbine,

recuperator, distributed energy resources, speed control

I. INTRODUCTION

DERs have received significant attention as a means to improve the performance of the electrical power system, provide low cost energy, and increase overall energy

efficiency. DERs are energy sources that are located near the load. By locating sources near the load, transmission and distribution costs are decreased and delivery problems mitigated. DER application can relieve transmission and distribution assets, reduce constraints, and improve power quality and reliability [1]. DERs are constituted by a variety of small, modular distributed generation (DG) technologies that can be combined with energy management and storage systems. DER devices enable renewable energies utilization and more efficient utilization of waste heat in combined heat

1A.K.Saha is with Electrical Engineering Department, Jadavpur University, Kolkata-700032, India (e-mail: akshay_ksaha@yahoo.com)

S.Chowdhury is with Women’s Polytechnic, Kolkata, India. (e- mail:sunetra69@yahoo.com)

and power (CHP) applications and lowering emissions. [2]. Recent technology improvements in various types of DERs, including microturbines, fuel cells, mini-hydro, battery storage, and so on, have created the opportunity for large- scale integration of DERs into distribution systems. Such on- site supply may be the most practical approach to address increasing power demand and power quality requirements, given the current electric utility restructuring as well as public environmental policy [3].

MTs are small and simple-cycle gas turbines. The outputs of the microturbines range typically from around 25 to 300 KW. They are part of a general evolution of in gas turbine technology. Techniques incorporated into the larger machines, to improve the performance, can be typically 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 small in size, compared to other distributed resources.

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

• Environmental superiority, NOx emissions lower than 7 parts per million for natural gas machines in practical operating ranges.

• Durable, designed for 11,000 hours of operation between major overhauls and a service life of at least 45,000 hours.

• Economical, system costs lower than $500 per KW, costs of electricity that are competitive with alternative including grid-connected power for market applications.

• Fuel flexibility, capable of using alternative/optional fuels including natural gas, diesel, ethanol, landfill gas and other bio-mass derived liquids and gases.

synchronous

generator,

1

S.P .Chowdhury is with Electrical Engineering Department, 700032, India (e-mail:schowdhury63@yahoo.com)

Kolkata- P.A.Crossley is with Joule Centre for Energy Research, The University of

Manchester, U.K. (e-mail: p.crossley@manchester.ac.uk)

©2008 IEEE.

Authorized licensed use limited to: The University of Manchester. Downloaded on October 9, 2008 at 06:50 from IEEE Xplore. Restrictions apply.

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