Publication: Design and development of high gain DC-DC boost converter system for PV applications
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Date
2024-08
Authors
Solomon, Cheong Jun Zhu
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Abstract
The increasing demand for renewable energy sources, coupled with advancements in photovoltaic (PV) technology, has led to growing interest in maximizing the efficiency and performance of PV systems. This sparks the development of high gain DC-DC boost converters in PV systems to provide a wide range of output voltages to meet their power requirements. Therefore, this paper presents the design and development of a high gain DC-DC boost converter system specifically tailored for PV applications. This research commences with the study of different topologies of high gain boost converters by evaluating their performance based on component count, voltage stress across switches, voltage gain and efficiency, followed by the designing of conventional DC-DC boost converter and the high gain DC-DC boost converter systems in MATLAB/Simulink and comparing their performances in terms of duty cycle, voltage gain, voltage stress across the switches, and power ratio. The research concludes by the development and validation of the hardware circuit of the high gain DC-DC boost converter system by measuring and analysing its output performance. Simulation results show that the high gain boost converter can generate a high voltage gain up to 200V at a duty cycle of 0.6536 whereas the conventional boost converter requires a duty cycle of 0.88 to achieve the same voltage gain. However, the drawback of this high gain boost converter is its lower efficiency at high duty cycles achieving a power ratio of only 69.62% for 200V voltage gain at 24V input voltage compared to 86.26% for the conventional boost converter. Lastly, the experimental results also shows that the efficiency of the high gain boost converter decreases as the duty cycle increases and it achieves a power ratio of 91.11% at a duty cycle of 0.3 and 24V input voltage which is close to simulation result, hence confirming the findings from the simulation.