Power Management Scheme and Power Quality Enhancement With a CNIFAGI-MSLPF-FLL and PMR Control in a SPV-BES Water Supply System

This paper presents a power management scheme to optimize the overall electrical energy consumption of a solar photovoltaic (SPV) array- battery energy storage (BES) based grid-connected microgrid (MG) for a water supply system (WSS). This paper utilizes the BES as an alternative to the diesel generator (DG) set to reduce the peak demand and energy consumption from the grid during peak hours and provide backup during the islanded condition. This paper also presents a cascaded non-identical frequency adaptive generalized integrator with a modified structure low pass filter type frequency locked loop (CNIFAGI-MSLPF-FLL) control algorithm during grid-connected mode (GCM) operation and a proportional multi resonant (PMR) controller with load current filter control during standalone mode (SAM) operation of the MG. The GCM and SAM controls along with the synchronization control, ensure seamless power transfer to the loads and improve the grid power quality (PQ) even in the presence of local nonlinear and single-phase loads. The power management with the load profile of WSS and the PQ performance of the system is analyzed in various conditions with developed Simulink model of MG.