Power grid frequency disturbance process wind storage coordination control method and system

Abstract

The invention provides a power grid frequency disturbance process wind storage coordination control method and system. The method comprises the steps of obtaining power grid frequency data in real time, and calculating a difference value between a current power grid frequency and a power frequency, determining a current frequency disturbance mode based on the difference value, and according to different frequency disturbance modes, adopting a control strategy reserved based on a pitch angle, considering the influence of the variable pitch rate on the load characteristics of the unit, and using an energy storage device for releasing electric energy. The scheme makes full use of the advantages of convenient energy release, no time delay of power output, stable and controllable power output and the like of the energy storage device, cooperates with the primary frequency modulation control strategy of the wind turbine generator, achieves the purpose of reducing the impact load and fatigue damage of the shaft system, and has a great significance for optimizing the load design of the wind turbine generator, improving the power grid friendliness characteristic of the wind turbine generator and guaranteeing safe and stable operation of units and power grids.

Description

technical field [0001] The disclosure belongs to the technical field of wind-storage coordinated control, and in particular relates to a wind-storage coordinated control method and system during a power grid frequency disturbance process. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The penetration rate of wind power is getting higher and higher, the equivalent inertia of the power system is decreasing, and the frequency of grid disturbances will also be higher and higher. The problem of safe and stable operation of wind turbines caused by frequent impacts on the mechanical structure of wind turbines by grid disturbances will become increasingly prominent, and the safe and stable operation of wind turbines is facing major challenges. [0004] Since the wind turbine is connected to the grid in the traditional power electronic mode, th...

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Problems solved by technology

[0005] The inventors found that, on the one hand, the electromagnetic torque oscillation of the wind turbine generator excites the drive chain shafting or a certain order mode in the left and right direction of the tower to resonate, which in turn causes a large impact load, which will pose a threat to the structural safety of the wind turbine

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