MODELING, SIMULATION AND POWER MANAGEMENT OF A STAND-ALONE WIND/PHOTOVOLTAIC ENERGY SYSTEM

A power management control (PMC) for a hybrid system that comprises wind and photovoltaic generation subsystems, a battery bank, and an ac load is developed in this paper. The objectives of the power control are, primarily, to satisfy the load power demand and, second, to maintain the state of charge of the battery bank to prevent blackout and to extend the life of the batteries. For these purposes, the system controller determines the operation mode of both generation subsystems, switching from power regulation to maximum power conversion. Decision criteria for PMC based on measurable system variables are presented. Finally, the performance of the PMC is extensively assessed through computer simulation using Matlab Simulink package. The simulation results are presented and show the effectiveness of the proposed method.