Dual MPPT algorithm for dual PV source fed Open-End Winding Induction Motor Drive for pumping application

Abstract

This paper presents a single-stage solution for a dual Maximum Power Point Tracking (MPPT) technique for a solar Photovoltaic (PV) fed water pumping system. The proposed solar PV fed pumping system uses a three-phase Open-End Winding Induction Motor (OEWIM) coupled to a centrifugal water pump. The OEWIM is connected via two time tested two-level three-phase inverters powered by two independent solar PV arrays. These two PV arrays can be configured independently and the employed dual MPPT algorithm operate the two PV sources at or near maximum power point (MPP) irrespective of its configuration. Usage of different array configurations may help in attaining more number of levels (greater than or equals to three) in the inverter output voltage (OEWIM phase voltage). Furthermore, the system is operated using decoupled Pulse Width Modulation (PWM) technique with V/f control along with the proposed dual MPPT technique. The maximum power extracted by the dual MPPT algorithm from two PV sources is optimally utilized by the OEWIM. This can be supported by the low slip value at all the operating conditions. The detailed analysis of proposed system and the simulation results are presented.