This paper investigates an improved active power control method for variable speed wind turbines to enhance the inertial response and damping capability during transient events. The optimized power point tracking controller which shifts the turbine operating point from the maximum power point tracking curve to the virtual inertia control 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 virtual inertia control on power oscillation damping capability are theoretically evaluated. Compared to the conventional 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 optimized power point tracking control. A prototype three-machine system containing two synchronous generators and a PMSG based wind turbine with 31 percent of wind penetration is tested to validate the proposed control strategy on providing rapid inertial response and enhanced system damping.

Abstract-In a DC grid, the inherent inertial support from the DC capacitors is too small to resist step changes or random fluctuations from the intermittent power resources, which results in lower DC voltage quality. In this paper, an adaptive droop control (ADC) strategy is proposed to achieve an increased inertia from the droop controlled converter.

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With the increase of the penetration rate of wind power in the power grid, the high proportion of renewable energy and the high proportion of power electronic equipment in the power system will continuously reduce the inertia of the grid, and the frequency stability of the system will be seriously affected. The inertia of the system is an important parameter for system frequency regulation and stability calculation. For this reason, a virtual inertial control technology based on fuzzy logic control is proposed in this paper, which is used for wind turbines to participate in grid frequency regulation. In this method, based on power tracking, a fuzzy logic controller is designed to adjust the frequency adjustment coefficient adaptively, and fuzzy logic rules are used to optimize the power tracking curve online. Finally, by building a hardware-in-the-loop real-time simulation platform, the effectiveness of this method in providing system frequency support and improving the frequency response of the power grid is verified.