Maximum power point tracking using llc resonant converter for pv power systems

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Date
2016-05-01
Authors
Adrian Tan Soon Theam
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Abstract
Maximum power point tracking (MPPT) is a crucial part in any photovoltaic (PV) systems and is thoroughly addressed in the literature. However, most of the existing MPPT systems use pulse-width modulated DC-DC converters. Recently, resonant DCDC converters have become famous for power processing due to their good characteristics such as low switching loss, high frequency operation and low electromagnetic interference. In this research work, an incremental conductance (INC) MPPT using LLC resonant converter is proposed for PV power systems. The LLC resonant converter can track the maximum power while operating in zero voltage switching region resulting in high efficiency for high frequency operation. In addition, an INC MPPT with constant voltage (CV) mode for battery charging is proposed in this study. Detailed implementation of the MPPT with CV mode algorithm and its flowchart as well as the design procedure of the LLC resonant converter is thoroughly discussed in this thesis. The experimental results of a 100W prototype shows that the converter obtains a peak efficiency of 81% for the entire design range. In addition, the converter exhibits good performance in capturing the maximum power under various environmental conditions while performing soft-switching capabilities
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