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A Phase-Shift-Modulated LLC-Resonant Micro-Inverter Based on Fixed Frequency Predictive-MPPT

Aswan Power Electronics Applications Research Center (APEARC), Faculty of Engineering, Aswan University, Aswan 81542, Egypt
Institute for Electrical Drive Systems and Power Electronics (EAL), Technical University of Munich (TUM), 80333 Munich, Germany
Electrical Engineering Department, Faculty of Engineering, Assiut University, Assiut 71516, Egypt
Electrical Engineering Departement, Faculty of Engineering, South Valley University, Qena 83523, Egypt
Authors to whom correspondence should be addressed.
Energies 2020, 13(6), 1460;
Received: 17 February 2020 / Revised: 17 March 2020 / Accepted: 17 March 2020 / Published: 20 March 2020
(This article belongs to the Section Solar Energy and Photovoltaic Systems)
Maximum Power Point Tracking (MPPT) control is an essential part of every photovoltaic (PV) system, in order to overcome any change in ambient environmental conditions and ensure operation at maximum power.. Recently, micro-inverters have gained a lot of attention due to their ability to track the true MPP for each individual PV module, which is considered a powerful solution to overcome the partial shading and power mismatch problems which exist in series-connected panels. Although the LLC resonant converter has high efficiency and high boosting ability, traditional MPPT techniques based on Pulse Width Modulation (PWM) do not work well with it. In this paper, a fixed frequency predictive MPPT technique is presented for the LLC resonant converter to be used as the first-stage in a PV micro-inverter. Using predictive control enhances the tracking efficiency and reduces the steady state oscillation. Operation with fixed switching frequency for the LLC resonant converter improves the total harmonic distortion profile of the system and ease the selection of circuit magnetic component. To demonstrate the effectiveness of the proposed MPPT technique, the system is simulated using MATLAB/Simulink platform. Furthermore, a 150 W hardware prototype is developed and tested. Both simulation and experimental results are consistent and validate the proper operation of the developed system. View Full-Text
Keywords: micro-inverter; LLC resonant converter; MPPT; phase-shift control; fixed frequency micro-inverter; LLC resonant converter; MPPT; phase-shift control; fixed frequency
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Abdel-Rahim, O.; Alamir, N.; Abdelrahem, M.; Orabi, M.; Kennel, R.; Ismeil, M.A. A Phase-Shift-Modulated LLC-Resonant Micro-Inverter Based on Fixed Frequency Predictive-MPPT. Energies 2020, 13, 1460.

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