“…For instance, Saini et al [19] argued that stable sunlight exposure is among the basic facts to maintain an isolated photovoltaic micro-grid to meet the load demand. However, during photovoltaic power generation, trees, fallen leaves, houses and clouds may block and shade the sunlight that is to shine on the photovoltaic panel, resulting in a voltage and current mismatch of photovoltaic modules and affecting the output power [20,21]. The voltage, current mismatch and power reduction level depend on different factors, for example, the photovoltaic cell material (structure and its inner material properties), climatic weather conditions and installation site location [22].…”