Power Management and Control for a Subsea Cable Tied Floating Solar PV-Battery Based Distributed Generation System for Remote Islands

The use of diesel generators (DG) sets as the central source of power generation can be lowered through supplementing the load requirement through installed renewable energy-based sources. The batteries due to their lower cost, lesser maintenance and storage property helps in reducing the DG set rating or eliminating the DG sets. Thus, remote islands use distributed solar photovoltaic systems and battery storage systems as primary sources of power. Proper power management and coordination between the distributed sources can minimize the use of grid power and help to earn revenue by maximizing the power sold by the renewable sources. The remote systems also face severe power quality issues due to connected electronic loads drawing harmonic dominant currents. Moreover, the presence of harmonics in the grid parameters lead to violation of the standard grid codes leading to penalty to the microgrid operators and the consumers. To reduce the effect of power quality, this work presents a control for better power quality performance of the system comprising of solar and battery storage system for a remote island application. A frequency adaptive pre-filter phase locked loop (FAPF-PLL) based control is deployed to improve the grid power quality indices. The developed power management scheme also regulates the BES to store or sell power to the grid to maximize the revenue based on generation, demand, battery state and tariff. The performance of power management and power quality controls are presented during several extreme conditions through simulation results.