Abstract-This paper investigates an improved active power control method for variable speed wind turbine to enhance the inertial response and damping capability during transient events. The optimized power point tracking (OPPT) controller, which shifts the turbine operating point from the maximum power point tracking (MPPT) curve to the virtual inertia control (VIC) curves according to the frequency deviation, is proposed to release the "hidden" kinetic energy and provide dynamic frequency support to the grid. The effects of the VIC on power oscillation damping capability are theoretically evaluated. Compared to the conventional supplementary derivative regulator-based inertia control, the proposed control scheme can not only provide fast inertial response, but also increase the system damping capability during transient events. Thus, inertial response and power oscillation damping function can be obtained in a single controller by the proposed OPPT control. A prototype three-machine system containing two synchronous generators and a PMSG-based wind turbine with 31% of wind penetration is tested to validate the proposed control strategy on providing rapid inertial response and enhanced system damping. Index Terms-Frequency support, permanent magnet synchronous generator (PMSG), power oscillation damping, variable speed wind turbine, virtual inertia control (VIC).
Recently, REF proposes a novel method by shifting the turbine operating points from MPPT curve to provide turbine virtual inertia.
Control of PMSG-Based Wind Turbines for System Inertial Response and Power Oscillation Damping
IEEE Transactions on Sustainable Energy
IEEE Transactions on Sustainable Energy
Engineering