DPC AND DTC CONTROL OF A VARIABLE WIND SPEED BASED ON DOUBLE FED ASYNCHRONOUS MACHINE

Abstract

This paper proposes two techniques to control DTC (Direct Torque Control) and DPC (Direct Power Control), applied to the system of converting wind energy with a double-fed asynchronous machine. Conventionally, the DTC is developed from the expressions of the model of DFIG in the reference connected to the rotor, so the amplitude of the flux is estimated from the voltages and currents of the rotor. The reference torque is obtained by a mechanical speed controller of the machine whose goal is to have a maximum power point tracking (MPPT). On the other hand, the DPC is achieved while using a new switching table without sensor voltage. The instantaneous active and reactive power is controlled directly by selecting the optimum condition of the network side converter. The main objective of the control system and maintain the DC bus voltage level required. Consequently, the input currents from the network should be sinusoidal and in phase with the voltages to meet operating at unity power factor. The results obtained show the interest of both techniques.