Abstract:
This paper proposes a high-performance shade-tolerant maximum power point tracking (STMPPT) technique for photovoltaic (PV) dc-dc converter stages. Two feedback loops regulate PV array current using average current-mode control (ACMC). Current-mode control is better for dc-dc power electronic converters. The STMPPT method has two modes. The ACMC with the perturb and observe (P&O) MPPT algorithm operates in local MPPT mode under normal irradiance. Global MPPT subroutines scan the PV profile to optimize PV system operation when the PV array is partially shaded. Simple ACMC-based P&O algorithm modifications achieve this. I-V observations help innovations. I-V characteristics reduce search space, make the algorithm independent of shading conditions and PV array configuration, and automatically detect partial shading conditions. STMPPT tracks global maximum power point quickly and accurately. It can also track direction without losing stability in dynamic environments. PV converter products could use its simplicity and independence. Outdoor PV installation operating conditions are simulated and tested.
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