Beyond Shadows: Mitigating the Impact of Partial Shading on Solar Cell Performance

Partial shading is one of the significant factors that lead to drastic reductions in solar photovoltaic systems' harvested power and efficiency. This paper elaborates, in detail, the effects of partial shading on the performance of solar cells and various means of reducing its ill effect. More specifically, it shall discuss the electrical characteristics of the shaded cells, hot-spot formation, and power losses emanating from these. Several circuit topologies and optimization methods focus on the side effects of shading. These include bypass diodes in module-level maximum power point tracking, or MPPT, and string optimizers beyond that. New technologies like bifacial and perovskite solar cells add extra value in terms of the higher shade tolerance. Further, it discusses some advanced optimization algorithms using machine learning and artificial intelligence, which could be used for intelligent shade mitigation. This raises challenges and points of future research for improved resilient and efficient solar energy systems.