Optimal Control of Wind Energy Generation System

Abstract

In this paper is presented a new wind turbine control technology, providing protection against overspeed accompanied by overcurrent in the electrical components. This technology is based on regulating the recharging voltage of the batteries by an AC-DC converter controlled in such a way as to maintain this constant voltage equal to the nominal charging voltage of the batteries. This operating regime is considered as the rated regime since the batteries are recharged by the nominal voltage injecting a nominal current into the batteries. The control algorithm developed subsequently allows continuous recharging of the batteries at nominal power. The control protocol makes it possible to impose the three voltages delivered by the generator in phase with the electromotive forces and having an amplitude equal to that of the recharging voltage of the batteries. This technology makes it possible to increase the disadvantages of using a mechanical brake such as the wear of the mechanical energy transmission components and the rise in the cost of the wind turbine. Compared to wind turbines controlled by electromagnetic torque control and those controlled by a lift chopper, those using an AC-DC converter have the advantage of simplicity of the control algorithm favoring the possibility of integration into electronic cards in real time.