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

Omar Abdel-Rahim, Nehmedo Alamir, Mohamed Abdelrahem, Mohamed Orabi, Ralph Kennel and Mohamed A. Ismeil
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Omar Abdel-Rahim: Aswan Power Electronics Applications Research Center (APEARC), Faculty of Engineering, Aswan University, Aswan 81542, Egypt
Nehmedo Alamir: Aswan Power Electronics Applications Research Center (APEARC), Faculty of Engineering, Aswan University, Aswan 81542, Egypt
Mohamed Abdelrahem: Institute for Electrical Drive Systems and Power Electronics (EAL), Technical University of Munich (TUM), 80333 Munich, Germany
Mohamed Orabi: Aswan Power Electronics Applications Research Center (APEARC), Faculty of Engineering, Aswan University, Aswan 81542, Egypt
Ralph Kennel: Institute for Electrical Drive Systems and Power Electronics (EAL), Technical University of Munich (TUM), 80333 Munich, Germany
Mohamed A. Ismeil: Institute for Electrical Drive Systems and Power Electronics (EAL), Technical University of Munich (TUM), 80333 Munich, Germany

Energies, 2020, vol. 13, issue 6, 1-16

Abstract: 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.

Keywords: micro-inverter; LLC resonant converter; MPPT; phase-shift control; fixed frequency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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