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

A technology of doubly-fed wind turbines and control methods, which is applied in the direction of generator control circuits, wind power generation, and control systems, and can solve the problems of secondary frequency drop of wind turbines, inability to fully utilize the frequency response capability of wind turbines, and insufficient control accuracy. Achieve full utilization, improve frequency response capability, and improve control accuracy

CN113839398APending Publication Date: 2021-12-24NANJING ELECTRIC POWER ENG DESIGN +2
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-12-24

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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.
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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...

Examples

Embodiment 1

[0131] When the wind speed is 11m / s, in order to analyze the influence of the droop coefficient on the frequency response performance of the doubly-fed wind turbine, take δ w 2%, 3.47%, 5%. Wherein, 2% is a relatively small setting value; 3.47% is a setting value obtained by the method of the present invention; 5% is a relatively large setting value, and the gained simulation is as follows Figure 4 shown.

[0132] from Figure 4 It can be seen that when δ w If the setting is too small (2%), the frequency of the power grid will drop twice during the frequency regulation process. When δ w If the setting is too large (5%), although the frequency of the grid does not drop twice during the frequency adjustment process, the absolute value of the maximum deviation of the dynamic frequency of the grid is greater than δ w When it is set to 3.47%, the absolute value of the maximum dynamic frequency deviation is large, and the frequency dynamic response effect is worse than that of...

Embodiment 2

[0134] When the wind speed is 13m / s, the pitch angle control works to reserve the reserve capacity. In order to analyze the influence of the droop coefficient on the frequency response performance of the doubly-fed wind turbine, take δ w 2%, 5%, and no droop control were added for comparison. Wherein, 2% is the setting value obtained by the present invention; 5% is a larger setting value, and the gained simulation is as follows Figure 5 shown.

[0135] from Figure 5 It can be seen that after adopting the variable droop coefficient setting method proposed by the present invention, the excessive response of the doubly-fed wind turbine can be avoided, and the dynamic response of the frequency can be effectively improved. Similar to the wind speed of 8m / s, when δ w If the setting is too large (5%), the method proposed by the present invention has better frequency response capability.

[0136] combine Figure 5 , Image 6 It can be seen that when the wind speed is 13m / s, p...