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Direct Torque and Power Control of PMSG Based Wind Turbine System

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Abstract: This paper presents the modelling and simulation of Direct Torque and Power Control of wind turbine driven permanent magnetic synchronous generator (PMSG) which feeds ac power to the utility grid. This system includes a wind turbine with a PMSG, the Machine Side Converter (MSC) and the Grid Side Converter (GSC). Direct Torque Control with Space Vector pulse Width Modulation (DTC-SVPWM) has been applied to control the MSC. Similarly the Direct Power Control with Space Vector Pulse Width Modulation (DPC-SVPWM) has been used .The Machine Side Converter is used to adjust the synchronous generator as well as to separate the generator from the grid when necessary. Flow of power between the DC bus and the AC side is controlled by Grid Side Converter controller. In order to compensate the torque and flux errors in a smoother way than conventional DTC, the SVPWM technique is utilized. The PMSG based on Wind Energy Conversion System (WECS) can be connected directly to the turbine without gearbox. Hence the cost for the maintenance of gearbox is reduced, and also it will decrease the weight of the nacelle. The complete Direct Torque and Power Control of WECS has been demonstrated by MATLAB simulation.

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