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Frequency modulation method of wind storage system based on double-layer cooperative control

A technology of collaborative control and wind storage, applied in the direction of information technology support system, wind power generation, AC network load balancing, etc., can solve the problems of frequency recovery impact, frequency secondary drop, etc., to reduce demand, improve dynamic characteristics, and avoid frequency The effect of the second perturbation

Active Publication Date: 2020-11-06
WUHAN UNIV +1
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Problems solved by technology

And the power command of the energy storage frequency modulation is only related to the system frequency and its rate of change. Since the change of the frequency support power of the wind turbine will affect the frequency recovery, and may even cause a secondary drop in the frequency, during the energy storage frequency modulation process, it is necessary to Further research on the method of synergistic cooperation between multiple wind turbines and energy storage in wind farms to provide frequency modulation control

Method used

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  • Frequency modulation method of wind storage system based on double-layer cooperative control
  • Frequency modulation method of wind storage system based on double-layer cooperative control
  • Frequency modulation method of wind storage system based on double-layer cooperative control

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Embodiment Construction

[0042] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

[0043] The theoretical basis and methods involved in the present invention will be introduced in turn below.

[0044] 1. Detect the frequency disturbance of the power grid, and detect the frequency disturbance of the doubly-fed wind turbine grid-connected power system.

[0045] The grid frequency disturbance is detected according to the inequality shown below.

[0046] |f s,t -f e |≥ε 2 (1)

[0047]

[0048] f s,t Indicates the grid frequency at time t; f e Indicates the rated frequency of the grid; ε 1 and ε 2 It is the comparison threshold of grid frequency increment and frequency change rate used to start frequency support control. Considering that for systems with a capacity of 3000MW and above in my country, the allowable frequency deviation is ±0.2Hz, and for systems below 3000MW, th...

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Abstract

The invention relates to a frequency modulation method of a wind storage system based on double-layer cooperative control, and provides a two-layer cooperative control scheme for providing frequency modulation response for a flywheel energy storage cooperative MPPT operation wind turbine generator based on a cooperative control theory by starting from optimization of frequency response dynamic characteristics of the wind storage system. The frequency deviation and the virtual electrical inertia of the wind turbine generator are linearly combined to form a macro variable, and a variable proportion coefficient speed regulation strategy for cooperatively providing frequency support for the wind turbine generators with different wind speeds is designed. Further, based on the linear combinationof the frequency deviation, the energy storage frequency modulation power instruction and the virtual inertia of the wind turbine generator, a macro variable is formed, and an additional frequency modulation active adjustment strategy that flywheel energy storage cooperates with the wind turbine generator to provide frequency support, rapidly recover MPPT operation of the wind turbine generator and avoid frequency secondary disturbance is designed. The method is good in robustness, simple in control structure and easy to implement in engineering, the frequency modulation response effect of the wind storage system on the power grid can be achieved, and the active adjustment speed requirement of the synchronous generator participating in frequency modulation is lowered.

Description

technical field [0001] The invention relates to a frequency modulation control method of a wind storage system, in particular to a control method in which multiple wind turbines in a wind farm cooperate with each other during the frequency change process and the energy storage cooperates with the wind turbines to jointly play a frequency support role. Background technique [0002] When wind turbines are connected to the grid using power electronic devices, their maximum power point tracking (MPPT) operation mode decouples the kinetic energy of the rotor from the grid frequency, and cannot provide rotational inertia support for frequency changes when the grid frequency is disturbed. With the increase of wind power grid-connected scale, the moment of inertia of the system will continue to decrease. Therefore, it is of great significance to study the friendly frequency support control of wind turbines to improve the frequency dynamic stability of wind power grid-connected system...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/28H02J3/30H02J3/38H02J3/46
CPCH02J3/241H02J3/28H02J3/30H02J3/381H02J3/466H02J2203/10H02J2300/28Y04S10/52Y02E10/76Y02E60/16
Inventor 彭晓涛梁恺秦世耀王靖然张政李华取陈人杰
Owner WUHAN UNIV
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