Effective wind speed estimation-based virtual inertia control method for large-scale wind turbine generator

Abstract

The invention discloses an effective wind speed estimation-based virtual inertia control method for a large-scale wind turbine generator. The method comprises the following steps that: S1, the rotating speed, output power, pitch angle, cabin wind speed and cabin vibration acceleration of the wind turbine generator are detected in real time, and a wind speed estimation value is obtained through aneffective wind speed estimation method; S2, the estimated output power of the wind turbine generator is obtained through a wind speed-power relation curve; S3, in a transition process control mode, energy absorbed or released in a virtual inertia control mode is calculated; S4, the supplement or absorption of the inertia energy of a wind wheel by the wind turbine generator is calculated; S5, timerequired by the transition process control mode is calculated; and S6, the output power set value of the wind turbine generator in the transition process control mode is calculated. With the Accordingto the method, smooth switching of the unit between a virtual inertia response control mode and a maximum energy tracking control mode is guaranteed, and large secondary impact on the frequency of apower grid caused by a virtual inertia response control recovery process is avoided.

Description

technical field [0001] The invention relates to the field of control of wind power generators, in particular to a virtual inertia control method for large wind power generators based on effective wind speed estimation. Background technique [0002] As conventional energy is largely replaced by wind power, the penetration rate of wind power in local power grids continues to rise, and the power system presents low inertia and weak damping operation characteristics. It is increasingly important for wind power to have the ability to actively support power grid frequency for power system stability. Large-scale wind turbines are usually connected to the grid through converters, and this control method does not respond to grid frequency changes. However, the rotor inertia of large-scale wind turbines is relatively large, and the virtual inertia control technology can be used to provide inertia support for the power system. Timely release or absorption can realize the inertia frequ...

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Problems solved by technology

[0005] The present invention mainly solves the problem of secondary drop in power grid frequency after the virtual inertia control of current wind turbines, and provides a virtual inertia control method for large-scale wind turbines based on effective wind speed estimation, which ensures that the turbines are in the virtual inertia response control mode and Smooth switching between maximum power tracking control (MPPT) modes, and avoiding a large secondary impact on the grid frequency, is conducive to the frequency stability of the power system

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