A hybrid FNLMS approach to improve the performance of a grid integrated solar PV system

Abstract

An improved performance of a 3-phase grid integrated solar photovoltaic (PV) system is presented by incorporating a hybrid fractional normalized least mean square (FNLMS) algorithm with an appropriate maximum power point tracking (MPPT) method. The adopted 3-phase, 3-wire, single stage grid system consists of PV array, filters, loads, and a 3-leg voltage source converter (VSC) with a DC link capacitor. The system with this FNLMS adaptive control algorithm seeks to achieve the objectives of unity power factor (UPF) at the source end, load balancing and reduced total harmonic distortion (THD). These objectives are accomplished by generating controlled switching pulses for the insulated gate bipolar transistor (IGBT) based VSC using hybrid FNLMS algorithm. The efficiency of the proposed algorithm is verified with experimental prototype developed in the laboratory.