Saber Hadj Abdallah, and Souhir Tounsi
Wind energy, speed regulation, AC–DC inverter, DC–DC inverter, optimal control, system cost reduction
This paper presents an optimal design and control methodology of wind energy system based on AC-DC-DC power conversion regulating conjointly turbine speed and battery load voltage to permit energy recovery in a battery accumulator at optimal regime. This application is dedicated to electric vehicles battery charging stations. The wind energy system allows a speed regulation permitting to avoid the use of an electromechanical braking system during over-speed phases accompanied by dangerous over-currents in the goal to reduce the cost of the wind power system. Indeed, the developed control technology allows a speed regulation of the electric generator to its optimal value, to avoid any over-speed problems leading to strong increases in current in the electrical components of the wind turbine, and subsequently to its destruction. This control technology also makes it possible to maintain the induced electromotive forces in phase with the phase’s currents of the generator to have an additive electromagnetic torque to the useful torque of the turbine in the goal to optimize the recovered energy. This control technology is based on two conversions types, one is an alternative-continuous conversion performed by an AC–DC converter with insolated gate bipolar transistors (IGBTs), and the other is a DC–DC conversion performed by a booster chopper, used to regulate the batteries recharging voltage to its nominal value.
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