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Development of DC-AC link converter for wind generator

By A. Z. Ahmad Firdaus, Riza Muhida, Ahmed M. Tahir and Ahmad Mujahid Ahmad Zaidi

Abstract

The usage of wind power as alternative source of energy in Malaysia is very scarce and perhaps limited to several private establishments. There is urgent need to locally develop the low cost wind turbine generator that has the capability to not only supply electricity to respective household but can be connected to power grid so that excess power could be sold back to the local utility company. Recent developments of power electronic converters allow stable supply needed for grid transfer in respect to nature of wind dynamics, enhanced power extraction and low total harmonic distortion (THD). In this project, an inverter circuit with suitable control scheme design is developed to be used with a wind turbine generator. From DC output of the generator, the DC-DC boost converter will step up the voltage to a nominal DC voltage at the grid. The inverter then will turn the voltage to sinusoidal AC to be transferred at grid. The duty cycle of signal controlling MOSFET transistors in the inverter will be controlled voltage source Pulse-Width Modulated (PWM) signal generated by microcontroller PIC16F877A based on pure sine wave data stored in the microcontroller memory. The lab-scale experimental rig involves simulation wind speed by running geared DC motor coupled with 500W wind generator where the prototype circuit will be connected at generator output. Expected circuit output is single phase 240V sine wave voltage which is nominal grid voltage. The next phase of the rig will involve testing the prototype circuit with site installed 500W wind generator. The necessary performance parameter will be evaluated

Topics: TK7800-8360 Electronics
Year: 2009
OAI identifier: oai:eprints.uthm.edu.my:3284

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