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Publication Title | Modeling and Control of Micro-Turbine Based Distributed Generation System

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INTERNATIONAL JOURNAL OF CIRCUITS, SYSTEMS AND SIGNAL PROCESSING

Modeling and Control of Micro-Turbine Based Distributed Generation System

Ashwani Kumar, K. S. Sandhu, S. P. Jain, P. Sharath Kumar

Abstract— Micro turbine generation is currently attracting lot of attention to meet users need in the distributed generation market due to the deregulation of electric power utilities, advancement in technology, environmental concerns. In this paper modeling of micro-turbine distributed generation system has been implemented and a new converter controller for a simulation of dynamic model of a micro-turbine generation system (MTG) has been proposed. The converter controllers are built on the dq synchronous frame. The converter controller models are implemented in the MATLAB / SIMULINK using SIMPOWER Systems library. The performance of the implemented MTG model is studied with an isolated load considering RL, LCL filter without and with reactive power injection into the system.

Keywords— Converter Controller, Distributed Generation, Filter, Micro-turbine, Permanent Magnet Synchronous Machine.

I. INTRODUCTION

With the deregulation of electric power utilities, advancement in technology, and environmental concerns, optimal distributed generation (DG) will be a focus to the electric utilities to cater the growing need of electric power [1]. Distributed generator is generally connected directly to grid or can operate independently. They are considered to be less than 5MW in capacity. DG can be based on renewable technologies such as wind turbine, photovoltaic or nonrenewable technologies such as micro-turbine and fuel cell. Distributed generation using micro-turbine generator (MTG) is a practical solution because of its environment- friendliness and high energy efficiency. Various applications such as peak shaving, co-generation, remote power and base load power will make its use world wide. Dynamic model of MTG system have been suggested in [2-8]. SIMULINK based dynamic model for micro- turbine system for distributed generation system has been

Ashwani Kumar is Assistant Professor in Electrical Engineering Department of National Institute of Technology, Kurukshetra, Haryana- 136119,India (phone: +91-1744-233389;fax:+91-1744-238050;email: ashwa_ks@yahoo.co.in).

K.S.Sandhu is Professor in Electrical Engineering Department of National Institute of Technology, Kurukshetra, Haryana-136119,India (phone: +91-1744-238001; fax: +91-1744-238050; e-mail: kjssandhu@yahoo.com).

S.P.Jain is Professor in Electrical Engineering Department of National Institute of Technology, Kurukshetra, Haryana-136119,India (phone: +91-1744-233372; fax: +91-1744-238050; e-mail: jainsp@rediffmail).

P.Sharth Kumar is research scholar in Electrical Engineering Department of National Institute of Technology, Warangal, India

proposed in [2-5]. A dynamic model of combustion gas turbine has been proposed in [6].

In MTG system, PMSM does not start as a generator. So, the PMSM start as a motor and it drives the micro- turbine. When the micro-turbine gets the ignition speed, then the PMSM runs as a generator. The configuration of MTG system is a three phase diode rectifier, a voltage source inverter (VSI) via DC link and with a filter. It requires a separate start up inverter during stating [4]. This paper describes a new configuration of MTG system. In this new configuration, the MTG system eliminates the start up inverter and uses back to back voltage source converter in the place of diode rectifier. The converter controllers are built on the dq synchronous frame. The converter controller models are implemented in the MATLAB / SIMULINK using SIMPOWER Systems library. The performance of the implemented MTG model with new converter control has been studied with an isolated load. The impact of RL and LCL filter without and with reactive power injection has also been studied on the load end side voltage and current waveforms.

II. MAIN COMPONENTS OF MTG SYSTEM

The basic components of a MTG system are the compressor, combustor, turbine, recuperator and high frequency generator with power electronics interfacing [2].

A. Micro-Turbine

The simplified single shaft gas turbine including all its control systems which is implemented in MATLAB / SIMULINK is shown in fig. 1 [5, 6]. The model consists of speed governor, acceleration control blocks, fuel system control, and temperature control and turbine dynamics.

B. Permanent Magnet Synchronous Machine (PMSM)

The model adopted for the generator is a 2-pole Permanent magnet Synchronous Machine (PMSM) with a non salient rotor. The machine output power is 30 kW and its terminal line to line voltage is 480V. The electrical and mechanical parts of the machine are each represented by a second order state space model. The model assumes that the flux established by the permanent magnets in the stator is sinusoidal, which implies that electromotive forces are sinusoidal. The following equations expressed in the rotor reference frame (dq frame) are used to implement PMSM [7, 8].

Issue 2, Volume 3, 2009

65

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