A frequency support control method based on two-stage power tracking optimization for doubly-fed wind turbines
A doubly-fed wind turbine, frequency support technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve problems such as secondary disturbance, adverse effects of grid frequency recovery, frequency recovery, etc., to achieve easy engineering implementation, Reduce adverse effects and avoid the effect of secondary disturbances
Active Publication Date: 2022-03-04
WUHAN UNIV
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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
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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 ...
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The present invention relates to a frequency support control method based on two-stage power tracking optimization for doubly-fed wind turbines. The present invention starts from optimizing the dynamic characteristics of frequency support of wind turbines, and proposes a frequency support control for wind turbines based on two-stage scaling factor optimization power tracking. method. On this basis, based on the virtual inertial time constant and the rotor motion equation, the variable proportional coefficient control strategy in the inertial response phase is deduced. At the same time, for the rapid restoration of the maximum power tracking operation mode of the wind turbine after the inertial support, avoiding damage to the system during the recovery process Frequency modulation produces secondary disturbances, and the fuzzy control is used to design the variable proportional coefficient control strategy in the recovery stage of the maximum power tracking operation mode. The invention has control robustness, simple control structure, easy engineering implementation, and can realize the inertia response of the doubly-fed wind generator set to the grid frequency and the rapid recovery of the maximum power tracking operation mode after inertial support.
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...
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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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