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Publication Title | Modelling and Simulation of Microturbine Generation System for on-grid and off-grid Operation Modes

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Modelling and Simulation of Microturbine Generation System for on-grid and off-grid Operation Modes

Noroozian R. 1, Abedi M. 2, Gharehpetian G. B. 2 and Hosseini S. H.3

1Department of Electrical Engineering, Faculty of Engineering, University of Zanjan, P.O.Box 45195-313, Zanjan, IRAN

E-mail: norozian@aut.ac.ir

2Department of Electrical Engineering, Amirkabir University of Technology, P.O. Box 15914, Tehran, Iran, Tel: (+98) 21 6646 3504, Fax: (+98) 21 6640 6469 E-mail: abedi@aut.ac.ir, grptian@aut.ac.ir

3Department of Electrical and Computer Engineering, Tabriz University, Tabriz, Iran E-mail: hosseini@tabrizu.ac.ir

Microturbine unit (MTU) is well suitable for a different Fuel

Compressed Ambient Air Air

Compressor

distributed generation applications, because the MTU is flexible in connection method, can be stacked in parallel to serve larger loads, can provide reliable power and has low-emissions profile [1]-[2]. The potential applications of the MTU configuration include peak shaving, premium power, remote power, and grid support [1]-[2]. In locations where power from the local grid is unavailable or extremely expensive to install, or the customer is far from the distribution system the MTU can be a competitive option. In this case, MTU is operated in off-grid mode. In the growing distribution system, the MTU can be a grid support. In this case, MTU is in on- grid mode. In this paper, a model for single shaft MTU has been developed and simulated by PSCAD/EMTDC and evaluated under on-grid and off-grid operation modes.

1. MTU Configuration

Fig. 1 shows the schematic diagram of a MTU, which has been studied in this paper. The MTU components are: single-shaft turbine with its control system, high speed permanent magnet generator, power electronic interfacing (rectifier and voltage source inverter) and control system for power electronic interface. The DC bus, shown in Fig. 1, is assumed to be lossless. Power electronic interface in the single shaft microturbine is a critical component. Microturbine is generally equipped with controls that allow the unit to be operated either in parallel with, or independent of the grid.

2. Modelling of Microtubine

The block diagram of the single shaft gas turbine is shown in Fig. 2. The model includes the temperature control, fuel system, turbine dynamic, speed governor and acceleration control blocks. The output of the speed control, temperature control, and acceleration control are all inputs of a low value select (LVS) block, whose output is the input of fuel system.

3. Power Electronic Interface

Power conditioning unit consist of a rectifier-inverter system with DC link. It is a general configuration of power electronic interface in the MT units.

Combustor

Exhaust

Turbine

on - grid

or

off - grid

Recuperator

Power Electronic Interface AC/DC/AC

Super - capacitors or Battery Banks

PMSG

DC Bus

Voltage and Current Meter

Rectifier AC/DC

AC Grid 400 V 50 Hz

LC Filter

Inverter DC/AC

Unbalanced AC Load

Actual signals

Control Signals

Reference signals

DC/AC Controller

Fig. 1. Schematic diagram of MTU

Load Ref. Speed Ref. +

+−

Speed

Fig. 2. Block diagram microturbine

The MT units are connected in parallel to achieve the required total system capacity and provide a level of redundancy. Grid connected mode (on-grid mode) allows the MTU to operate parallel to the grid, providing base loading and peak shaving and grid support. Stand alone mode (off-grid mode) allows the MTU to operate completely isolated from the grid.

A. ON-GRID OPERATION

In this operation mode, the inverter must regulate the DC link voltage at 0.75 kV, and control the active and reactive powers injected into the AC grid, considering the

Temperature Control

Speed Control

LVS (min)

Fuel System

Compressor Turbine

Acceleration Control

Torque

Image | Modelling and Simulation of Microturbine Generation System for on-grid and off-grid Operation Modes



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