Abstract
This paper puts forward a control strategy suitable for single-phase photovoltaic (PV) fed cascade H-bridge (CHB) inverter with grid connection. The proposed control scheme is embedded with ripple correlation control (RCC) based maximum power point tracking (MPPT) to ensure the efficient energy conversion. The control scheme employed enables the independent control and operation of individual DC link voltage, ensuring the extraction of maximum available power from each PV panel. In addition, low harmonic grid currents are generated with any arbitrary power factor. Numerical simulation was performed using the MATLAB/SIMULINK platform and results for seven level CHB inverter are presented to corroborate the theoretical concepts and control strategy proposed.
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