Variable droop coefficient control method for double-fed fan participating in primary frequency modulation of power grid

Abstract

The invention relates to a variable droop coefficient control method for a doubly-fed fan participating in primary frequency modulation of a power grid, which comprises the following steps of 1) acquiring real-time wind speed, and monitoring a frequency deviation signal of the power grid in real time, 2) adding a user-defined variable droop characteristic unit into a traditional rotor active power controller, and setting a droop control difference adjustment coefficient of the double-fed fan participating in primary frequency modulation of a power grid at different wind speeds, 3) optimizing a difference adjustment coefficient of droop control based on a grey wolf optimization algorithm, and 4) according to the power grid frequency deviation signal, setting the optimized droop control difference adjustment coefficient to obtain an extra active power increment, and participating in frequency modulation according to the active power increment. The method has the beneficial effects that frequency secondary drop caused by excessive response of the wind turbine generator due to too small difference adjustment coefficient setting is avoided; the control precision is improved, the self-adaptive capability is better, the available capacity of the real-time unit can be fully utilized, and the frequency response capability of the unit is improved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a variable droop coefficient control method for a doubly-fed wind turbine participating in primary frequency regulation of a power grid. Background technique [0002] With mature technology, short construction period and low cost, wind power generation has gradually become one of the new energy sources vigorously developed by countries all over the world. As a renewable energy source, although wind farms have certain value in terms of energy conservation, emission reduction, and optimization of power supply structure, the wind in nature is unstable, and the wind speed fluctuates from time to time, making it highly random and uncontrollable. Therefore, the large-scale grid connection of wind power will inevitably have a great impact on the system frequency stability. [0003] Doubly-fed wind turbine is the mainstream type of wind power generation. Since...

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Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned existing technologies, it solves the drooping control curve fitted by a small amount of data, the control accuracy is insufficient, the excessive response of the wind turbine causes the frequency to drop twice due to the setting of the adjustment coefficient is too small, and the setting of the adjustment coefficient is too large , leading to the problem that the frequency response capability of the wind turbine cannot be fully utilized. The present invention proposes a variable droop coefficient control method in which the double-fed wind turbine participates in the primary frequency modulation of the power grid, which is specifically implemented by the following scheme:

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