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Frequency support control method used for doubly-fed wind generation set and based on two-stage power tracking optimization

A doubly-fed wind turbine, frequency support technology, applied in wind power generation, reduction/prevention of power oscillation, electrical components, etc., can solve the adverse effects of power grid frequency restoration, frequency restoration, secondary disturbances, etc., to reduce adverse effects , easy engineering implementation, avoiding the effect of secondary disturbance

Active Publication Date: 2019-03-08
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it cannot provide frequency modulation support for the system, it has good operating economy
[0003] It is worth pointing out that in the process of using the rotor kinetic energy of the wind turbine to achieve frequency support, since the wind power captured by the wind turbine will decrease as the speed deviates from the optimal speed for maximum power tracking, the wind turbine needs to absorb electromagnetic energy from the grid during the recovery speed stage. power, which will not only adversely affect the restoration of grid frequency, but may also cause secondary disturbances in frequency restoration

Method used

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  • Frequency support control method used for doubly-fed wind generation set and based on two-stage power tracking optimization
  • Frequency support control method used for doubly-fed wind generation set and based on two-stage power tracking optimization
  • Frequency support control method used for doubly-fed wind generation set and based on two-stage power tracking optimization

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Experimental program
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Effect test

Embodiment

[0042] Embodiment: The theoretical basis and methods involved in the present invention will be introduced in turn below.

[0043] 1. Detect the frequency disturbance of the power grid, and detect the frequency disturbance of the doubly-fed wind turbine grid-connected power system.

[0044] The grid frequency disturbance is detected according to the inequality shown below.

[0045]

[0046] |f s,t -f e |≥ε 2

[0047] 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 inertia response phase control. When the per unit value is used for control calculation, the threshold ε 1 =ε 2 =0.01 means that when the change rate of the grid frequency is greater than 0.5Hz / s or the variation of the grid frequency is greater than 0.5Hz (the default grid rated frequency is 50Hz), the wind turbine will start the frequency i...

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Abstract

The invention relates to a frequency support control method used for a doubly-fed wind generation set and based on two-stage power tracking optimization. The invention starts from optimization of frequency support dynamic characteristics of a wind generation set and provides a frequency support control method used for the wind generation set and based on two-stage variable proportion coefficient optimized power tracking. On the basis, a variable proportion coefficient control strategy in an inertial response stage is derived based on a virtual inertia time coefficient and a rotor movement equation, and for quick recovery of a maximum power tracking operation mode of the wind generation set after inertial support and avoiding secondary disturbance from being produced on system frequency adjustment in a recovery process, a variable proportion coefficient control strategy in a maximum power tracking operation mode recovery stage is designed by adopting fussy control. The frequency supportcontrol method provided by the invention has control robustness, a control structure is simple, engineering implementation is easy, and the quick recovery of the maximum power tracking operation modeof the doubly-fed wind generation set after inertial response and inertial support on a power grid frequency can be realized.

Description

technical field [0001] The invention relates to a frequency support control method of a wind turbine, in particular to a control method for the wind turbine to provide frequency inertia response based on rotor kinetic energy adjustment and the wind turbine to quickly restore the initial maximum power tracking operation mode after providing frequency support. Background technique [0002] When wind turbines are connected to the grid using power electronic devices, their maximum power tracking (MPPT) operation mode will decouple the kinetic energy of their rotors from the grid frequency, and cannot provide rotational inertia support for frequency changes when frequency disturbances occur in the grid. Therefore, with the increase of the proportion of wind power connected to the grid, it is of great significance to study the friendly inertial control of wind turbines to improve the frequency response characteristics, damping characteristics and dynamic stability of wind power sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/386H02J3/24Y02E10/76
Inventor 彭晓涛周际城黄思宇贾继超罗鹏梁恺张政
Owner WUHAN UNIV
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