Design and implementation of an inverter control circuit for residential wind generator
Current utilization level of wind power as alternative source of energy particularly electricity in Malaysia is very low. Some sites particularly coastal and hilly areas have low but steady wind energy supply that is potential to generate electricity for residential use. There is urgent need to l...
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Main Author: | |
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Format: | Thesis |
Language: | English |
Published: |
International Islamic University Malaysia (IIUM)
2014
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Subjects: | |
Online Access: | http://dspace.unimap.edu.my:80/dspace/handle/123456789/33556 |
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Summary: | Current utilization level of wind power as alternative source of energy particularly
electricity in Malaysia is very low. Some sites particularly coastal and hilly areas have
low but steady wind energy supply that is potential to generate electricity for
residential use. There is urgent need to locally develop the low cost wind turbine
generator for residential use. Recent developments of power electronic converters and
embedded computing allow improvement of power electronic converter devices that
enable integration of microcontrollers in its design. This has made possible: more
flexible control and stable output in respect to nature of wind dynamics, enhanced
power extraction and low total harmonic distortion (THD), attributes needed for good
quality electrical supply is achievable at lower cost. In this project, an inverter circuit
with suitable control scheme design was developed. The circuit was to be used with a
selected topology of Wind Energy Conversion System (WECS) to convert electricity
generated by 500W direct-drive permanent magnet type wind generator which is
typical for residential use. From single phase AC output of the generator, rectifier
circuit is designed to convert AC to DC voltage. Then DC-DC boost converter was
used to step up the voltage to a nominal DC voltage suitable for domestic use. The
proposed inverter then will convert the DC voltage to sinusoidal AC. The duty cycle
of sinusoidal Pulse-Width Modulated (SPWM) signal controlling switches in the
inverter was generated by microcontroller PIC16F877A. The lab-scale experimental
rig involves simulation wind of wind generator by running geared DC motor coupled
with 500W wind generator where the prototype circuit was connected at generator
output. Experimental circuit produced output voltage single phase 240V sinusoidal
AC voltage with frequency of 50Hz. This output complied nominal grid voltage of
240V +5% and -10% and frequency of 50Hz as per requirement by Malaysian
Standard MS406:1996. Measured total harmonics distortion (THD) of the voltage
across load was 4.0% which is within limit of 5% as recommended by IEEE Standard
519-1992. |
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