Energy efficiency of the PV panels using a MPPT controller with improved search speed: Part II: Simulation results

Abstract

In the second part of this paper the Maximum Power Point Tracking (MPPT) technique for photovoltaic (PV) panels based on modified Extremum Seeking Control (mESC) is analyzed. Even the mESC scheme differs from the classical ESC schemes only on the filters' topology and their used parameter, this proposed control improves quite enough the performances of the PV energy harvesting in comparison with a high-order ESC (hoESC) scheme. In this paper, based on an analysis in the frequency domain, it is demonstrated that an almost double search speed of the PV MPP could be obtained for the mESC scheme in comparison with the hoESC scheme. The mESC scheme is based on a band pass filter (BPF), while the hoESC scheme is based on a series connection of the high pass (HP) and the low pass (LP) filters. Also, the operation of the mESC scheme in the PV Hybrid Power System (HPS) is shown. The simulations performed under different irradiance conditions have shown that the mentioned performances are effective if the mESC scheme is used as MPPT controller.