Virtual inertia control method for wind field battery energy storage system

Abstract

The invention discloses a virtual inertia control method for a wind field battery energy storage system. The method comprises the following steps: firstly, stabilizing wind field output active power fluctuation based on a general control strategy of a battery energy storage system; further, considering the influence of system disturbance on the frequency, and based on a synchronous generator rotormotion equation, establishing a battery energy storage system virtual inertia control model for providing inertia support; and finally, dynamically correcting the virtual inertia control model according to the relative magnitude of the frequency fluctuation of the wind field to obtain a virtual inertia control strategy for the wind field battery energy storage system. On the premise that the reliability of the system is guaranteed, the characteristic that the battery energy storage system dynamically absorbs and releases energy is brought into full play, system frequency fluctuation is reduced while wind field output power fluctuation is stabilized, and safe and stable operation of the system is improved. The control method can be used as an effective reference for stabilizing wind fieldoutput fluctuation and improving wind field inertia control.

Description

technical field [0001] The invention relates to a virtual inertia control method, in particular to a virtual inertia control method for a wind field battery energy storage system. Background technique [0002] In order to promote the sustainable development of energy and environment, renewable energy such as wind energy has been widely used. As the penetration rate of wind power in the power system continues to increase, the problems brought about by the development of wind power are also emerging. Most traditional wind turbines adopt the traditional maximum power point tracking control strategy and are connected to the grid through low-inertia power electronic equipment. The wind power generation system is almost decoupled from the grid, reducing the system inertia and making the wind farm hardly respond to frequency fluctuations in the grid. At the same time, the inherent randomness and volatility of wind power pose a threat to the safe and stable operation of the power s...

AI Technical Summary

Problems solved by technology

Most traditional wind turbines adopt the traditional maximum power point tracking control strategy and are connected to the grid through low-inertia power electronic equipment. The wind power generation system is almost decoupled from the grid, reducing the system inertia and making the wind farm hardly respond to frequency fluctuations in the grid. At the same time, the inherent randomness and volatility of wind power pose a threat to the safe and stable operation of the power system.

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