Power management and control for solar-wind-diesel stand-alone hybrid energy systems

Abstract

A simulation based research on developing a power management and control system for stand-alone solar-wind-diesel hybrid energy systems is presented in this dissertation. The simulation model of stand-alone system is developed from mathematical models of solar photovoltaic system, wind turbines and diesel generators. A multi-variable control system is developed and implemented into the simulation models in order to achieve optimum performance. The model of solar photovoltaic energy conversion system is constructed with maximum power point tracking control to extract maximum power from the solar photovoltaic system. An improved control system is developed for wind energy conversion system to optimize the operation of wind turbine through speed regulation and maximum power point tracking control. In addition, a governor control system is developed for the diesel generation system. The frequency regulation system consist conventional phase locked loop system and a voltage regulator in order to regulate the load voltage. A power management strategy is introduced to share the generated power and to improve the power quality where priority is given to the wind energy conversion system. The power management algorithm controls the sharing of generated power and optimizes the hybrid operation. The complete model of stand-alone solar-wind-diesel hybrid energy system is simulated in Matlab®/Simulink® interface. Results obtained from the simulation are presented to validate the control algorithms developed in this work.