This paper presents an implementation of the threelevel back-to-back neutral-point-clamp voltage source converter based PMSG wind energy conversion system (WECS). The generator-side converter performs the maximum power point then tracks, integrates and optimizes control with the d-axis stator current control (ZDSC), while the grid-side converter regulates the dc-link voltage and reactive power to the gird via voltage oriented control (VOC). An even simple modified unipolar CB-PWM strategy for the three-level BTB NPC VSC is implemented to simplify the modulation algorithm. The simulation results are demonstrated to provide the performance and stability of the three-level BTB NPC VSC based-PMSG WECS in both the stand-alone and grid-connected conditions. Index Terms-Permanent-magnet synchronous generator (PMSG), wind generation, three-level back-to-back neutralpoint-clamp voltage source converter, carrier-based pulse width modulation, d-axis stator current control

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This paper presents a modeling of stator current control of PMSG for grid-connected systems. The modeling of the power circuit and control-side are performed and represented by using MATLAB/Simulink software to predict and investigate the system operation and the system's dynamic response. Zero-d axis stator current control is implemented to optimize the PMSG for the generator-side converter. The grid side control scheme decouples active and reactive-power thought voltage-oriented control for the grid-side converter independently. The simulation results are demonstrated to provide the performance and stability of the grid-connected PMSG in the dynamic and steady-state conditions.

This paper presents a performance enhancement of a permanent magnet synchronous generator (PMSG) system with control of generator-side converter for a wind turbine application. This method uses zero d- axis stator current control to minimize winding losses of the generator. The electromagnetic torque of the generator is correlated with the magnitude of the qaxis stator current, while the daxis stator current is regulated at zero, the control scheme decouples the dq-axis stator current control through a vector con- trol for the generator-side converter. This paper also presents mathematical analysis of the active power and stator power factor, and the maximum power point tracking (MPPT) operation. Simulation re- sults are provided to guarantee the proposed control scheme, in which the performance enhancement and eciency are evaluated.