Development of dspace-based fuzzy logic three-phase inverter controller for photovoltaic application enhancement

Zamre , Abd. Ghani (2014) Development of dspace-based fuzzy logic three-phase inverter controller for photovoltaic application enhancement. PhD thesis, UTeM.

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Fossil fuel which is the conventional energy source that is used to generate electricity is exhausting and therefore finding alternative energy sources is of a great concern for present and future energy demand. Photovoltaic (PV) is one of the promising renewable energy sources, especially for remote areas. It is a dc source and requires an inverter for converting it to usable power for ac loads. Its nonlinearity characteristic and output fluctuation, pose challenges in the PV inverter design. In this research, an inverter control system is designed and developed in such a way that the impact of PV output fluctuation towards the inverter performance is minimized. Issues concerning inverter such as output harmonic, power factor, switching scheme and losses, and system implementation need to be addressed in the inverter design. To achieve a robust and simple implementation of inverter control which does not require plant mathematical model, a fuzzy logic controller (FLC) is employed in the PV inverter control system. By utilizing the FLC for the inverter voltage control scheme algorithm, the duty cycles of the IGBTs are optimized according to the desired voltage. The duty cycle generation algorithm which is based on the sinusoidal pulse-width modulation technique enables the control system to lower down the inverter output harmonic content. Prior to the prototype development, the inverter model and control system were developed, simulated, and verified in MATLAB/Simulink. A three-phase inverter prototype acquiring a maximum capacity of 3 kW has been built to justify the capability of the control algorithm in generating and stabilizing a quality sinusoidal output waveform of required voltage and frequency. In doing so, a dSPACE DS1104 controller board was employed, to which the developed inverter control algorithm was linked and loaded. The system operation was tested using the 2 kW PV array as the dc input power. The experimental results have shown that the inverter control system was capable of generating and stabilizing sinusoidal voltage of 415 V at a frequency of 50 Hz. Investigations have been made on the inverter performance with and without the utilization of output filter. With the filter, the level of total harmonic distortion (THD) of the inverter output voltage is kept to 2.5% which complies with the IEEE Std 519-1992. The developed inverter performance results are validated with that of the simulation results as well as compared with PV-based inverter control system, in terms of THD, power factor, switching technology, hardware, and system environment. It is found that, the developed inverter control system is more capable and efficient in converting the PV power to usable power for ac loads. This proves the efficacy of the developed control algorithm and therefore is very effective and suitable to be utilized for PV power conversion applications. The dSPACE-based developed inverter prototype is designed and developed in such a way that it is flexible and practical, whereby both the hardware and control system are fully alterable to accommodate the needs for new and future designs especially the control system. The developed inverter with the control system has great potential and prospective to be used in remote areas for providing power to ac loads. Besides, it can be utilized as an interface device for contributing and feeding PV power to the utility grid, such as in the grid-connected system.

Item Type: Thesis (PhD)
Uncontrolled Keywords: Power electronics, Electric current converters
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Library > Tesis > FKEKK
Depositing User: Norziyana Hanipah
Date Deposited: 29 Jul 2015 06:40
Last Modified: 29 Jul 2015 06:40
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