A quick and effective MPPT scheme for solar power generation during dynamic weather and partial shaded conditions

Abstract

Photovoltaic (PV) panels are equipped with Maximum Power Point Tracking (MPPT) schemes to extract utmost available power even during dynamic weather conditions (DWC) and partial shaded conditions (PSC). Though P-V and I-V characteristics of a PV system are affected by DWC and PSC, they have a constant current region (CCR) and constant voltage region (CVR). To achieve the optimal operating point of a PV system, the existing conventional MPPT schemes have to pass through CCR and CVR regions which consume time. Hence, this paper presents a novel MPPT scheme that eliminates perturbation in constant regions in any condition by projecting tangents over P-V characteristics thereby approaches an estimated point on the top of the curve quickly. Further, the iterative procedure involved in the proposal achieves the exact optimal point according to operating conditions of the system. Experimental and simulation results of the proposed methodology provide enough evidence to prove the superiority of the proposed method over conventional Perturb and Observe (P&OC) scheme. Keywords: Tangent perturbation on P-V characteristics, Global Maximum Power Point (GMPP), Constant current region (CCR), Constant voltage region (CVR), Maximum Power Point Tracking (MPPT) and Partial shaded condition (PSC)