A frequency regulation method based on double-layer cooperative control for wind storage system

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 facilitate engineering Achieved effect

Active Publication Date: 2022-03-29
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

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  • A frequency regulation method based on double-layer cooperative control for wind storage system
  • A frequency regulation method based on double-layer cooperative control for wind storage system
  • A frequency regulation method based on double-layer cooperative control for wind storage system

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[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, t...

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Abstract

The invention relates to a frequency modulation method based on double-layer cooperative control of a wind storage system. Starting from optimizing the dynamic characteristics of the frequency response of the wind storage system and based on the theory of cooperative control, a two-layer cooperative control of frequency modulation response provided by flywheel energy storage and MPPT operating wind turbines is proposed. Program. By linearly combining the frequency deviation and the virtual electrical inertia of the wind turbines to form a macro variable, a speed regulation strategy with variable proportional coefficients is designed to realize the cooperation of wind turbines with different wind speeds to provide frequency support. Further, based on the linear combination of frequency deviation, energy storage frequency modulation power command and wind turbine virtual inertia to form a macro variable, the flywheel energy storage cooperates with the wind turbine to provide frequency support, quickly restore the wind turbine MPPT operation and avoid the frequency secondary disturbance. Additional frequency modulation active power Regulatory strategy. The invention has good robustness, simple control structure and easy engineering realization, can realize the frequency modulation response effect of the wind storage system to the power grid, and reduce the active power adjustment speed requirement for the synchronous generator to participate in the frequency modulation.

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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Patent Type & Authority Patents(China)
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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