Abstract
This paper proposes the decoupling control of direct torque control (DTC) and field orient control (FOC) for doubly fed induction generator (DFIG)-based wind energy system (WES). The proposed technique reduces the transient of system during low voltage ride through (LVRT) as well as voltage dip (VD) with out auxiliary circuit. The combined DTC–FOC regulates both rotor and grid side converters (RGSCs). In particular, DTC controls the generator speed, torque and rotor flux; similarly, FOC regulates the capacitor link voltage and power quality of grid during LVRT and VD. The linear controller is unable to control the nonlinearities of system dynamics with respect to time. Further, the proposed technique is analyzed with sliding mode control (SMC) and conventional controllers independently. The proposed DTC–FOC aims to improve the performance of transient and dynamic behavior of DFIG-based WES during LVRT and VD. It is also tested in real-time environment at 7.5 hp as well as MATLAB/SIMULINK of 5.5 kW rating.
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