Implementation of Modified P&O Method as Power Optimizer of Solar Panel under Partial Shading Condition for Battery Charging System

Photovoltaic (PV) module is used to convert solar energy to electrical energy. The output power of PV module is affected by the amount of irradiation of sun and temperature of PV module. The problem that may occur is partial shading caused by some objects such as trees, building, clouds, and so on. The impact of this condition is the decrease of output power of PV and the maximum power point (MPP) become more than one. Maximum power point of P-V characteristic curve will be more than one such as GMPP (Global Maximum Power Point) and LMPP (Local Maximum Power Point). This case cannot be solved using the ordinary MPPT (Maximum Power Point Tracking) method because the maximum power is trapped on wrong point, it is LMPP. Therefore, to overcome this problem. Modified P&O (Perturb and Observe) method is proposed as a MPPT method under partial shading condition. The proposed method is implemented on SEPIC converter to get actual maximum power point (GMPP). Experiment results prove the Modified P&O method can generate greater power and faster charging process on battery. The State of Charge of battery increases about 30% if the Modified P&O method. which is applied on battery charging system.