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Publication Title | Mat lab/Simulink Based Dynamic Modeling of Microturbine Generator for Grid and Islanding Modes of Operation

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IJMTST | International Journal for Modern Trends in Science and Technology

Mat lab/Simulink Based Dynamic Modeling of Microturbine Generator for Grid and Islanding Modes of Operation

K. Venkat Kishore

Associate Professor, Department of EEE NRI Institute of Technology, Vijayawada

Abstract—Distributed generation (DG) is installed by a customer or independent electricity producer that is connected at the distribution system level of the electric grid. Distributed generation installed at sites owned and operated by utility customers, such as micro turbine generator (MTG) serving a house or a co-generation facility serving an office. This paper presents the insertion of modeling of micro turbine generator in distributed generation for grid connection and islanding operation. The presented paper permits the power flow in both the directions that is in between grid and MTG. The control strategies for grid connection and islanding operation are also presented in this paper.

Keywords—Power conditioning, MTG, Distributed generation, Grid, Islanding, Voltage restorer

I. INTRODUCTION

Distributed generation is a new trend in the generation of heat and electrical power. Distributed generation, also called on-site generation and dispersed generation. The distributed generation concept permits the "consumer", who is generating heat or electricity for their own needs, to send their surplus electrical power back into the power grid or share excess heat via a distributed heating grid. Distributed generation (DG) refers to power generation at the point of consumption. Generating power on-site, rather than centrally, eliminates the cost, complexity, interdependencies, and inefficiencies associated with transmission and distribution. Distributed generation is based on different types of renewable energy resources like photo voltaic (PV), wind turbine, microtubine [1] generator and fuel cell. In distributed generation microturbine is preferred because of it’s environmental friendliness with high efficiency. An accurate dynamic model of the microturbine generator is required to analyze transient, stability, harmonics and power quality when connected to the distribution system. A dynamic model of gas turbine was discussed in the previous papers which represent dynamics like speed, acceleration, temperature and fuel controls. A dynamic model of MTG for isolated operation and control of grid connected for split shaft microturbine is considered for this paper. The conversion of power from AC- DC-AC and the modeling of MTG for both grid connected and islanding operation is considered for the simulation of MTG in Matlab. In this paper two controls are developed. The first one to control the grid interface and the second to control islanding operation of the system. Using matlab/simulink the single shaft MTG is developed in this paper. An extended

Rajasekhar G. G

Associate ProfessorDepartment of ECE Guntur Engineering College, guntur

simulation work is carried in this paper to study the dynamic model of MTG when connected to the distribution networks.

A. MicroturbineSystemModeling

In this section a model for dynamic analysis of a microturbine generation system is developed. The proposed model describes the dynamics of this device when used as distributed generation source. This model is suitable for transient simulation, analysis and the final model can be used in a distribution network to study the effect of microturbine system on the distribution network stability and the effect of network transients on the microturbine stability. In order to model a microturbine [2] system, four major parts are considered. They are high speed gas turbine, high speed permanent magnet generator, power conditioning unit which itself consist of a rectifier and an inverter and the final part is load connected to microturbine terminal. The proposed model is consisting of the dynamics of each part and their interconnections. The generator generates a very high frequency three phase signal ranging from 1500 to 4000 Hz. The high frequency voltage is first rectified and then inverted to a normal 50 or 60 Hz voltage. The microturbine generate power is in the range of 30 kW, 60 kW, 65 kW, 200 kW, 600 kW, 800 kW, and 1 MW. Figure 1 shows the components of the microturbine generator.

B. Microturbine

Microturbine are small electricity generators that burn gaseous and liquid fuels to create high-speed rotation that turns an electrical generator. The basic components of a microturbine [2] are the compressor, turbine generator, and recuperator is shown in Fig 2. The heart of the microturbine is the compressor-turbine package, which is commonly mounted on a single shaft along with the electric generator. Two bearings support the single shaft. The single moving part of the one-shaft design has the potential for reducing maintenance needs and enhancing overall reliability.

C. Bearings

Microturbines operate on either oil-lubricated or air bearings which support the shaft(s). Oil-lubricated bearings are mechanical bearings which are in three main forms - high- speed metal roller, floating sleeve, and ceramic surface. The latter typically offer the most attractive benefits in terms of life, operating temperature, and lubricant flow. While they are a well-established technology, they require an oil pump, oil filtering system, and liquid cooling that add to microturbine

Volume 1, Issue 1, September 2015

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