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Design and implementation of an internal model controller applied to MPPT PV systems using phase‐shift full‐bridge DC–DC converter

This paper presents the design of an internal model controller with one degree of freedom (1DOF‐IMC) that will be applied to a full‐bridge DC–DC converter driven by phase‐shift PWM. This DC–DC converter will be used in photovoltaic systems for maximum power point tracking (MPPT), with the objective of developing a single‐phase micro‐inverter connected to the grid integrated to the photovoltaic module. It will be presented the mathematical modeling of this converter to control the input voltage aiming the application in MPPT and the design of the respective controller. The proposal testing and validation strategy was performed by comparison with a PI compensator. Simulations and experimental results will be presented and the performance of both controllers are evaluated and discussed. Both control strategies were discretized with the sampling frequency at 20 kHz and implemented in a floating point using the Texas Instruments® DSC TMS320F28335.