Method and device for suppressing low-frequency oscillation of wind power grid-connected system

A low-frequency oscillation and wind power technology, applied in the direction of reducing/preventing power oscillation, single-network parallel feeding arrangement, AC network to reduce harmonic/ripple, etc., can solve the problem of power angle stability of wind turbine grid-connected system and can only be analyzed qualitatively , Neglecting the ability of the fan to oscillate, reducing the stability of the system and other issues, to achieve the effect of avoiding excessive oscillation amplitude and destabilization, rapid suppression, and improving the stability of the power angle

Pending Publication Date: 2022-07-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0004] However, there is a contradiction between the low-frequency oscillation suppression effect and the complexity of data measurement and processing, so the basis for selecting the measurement signal is not convincing enough, so that the control link can only qualitatively analyze the power angle stability of the wind turbine grid-connected system, thereby reducing the impact of measures on the system. stabilization effect
At the same time, the external damping controller in the prior art only focuses on improving the ability to suppress low-frequency oscillations, ignoring the ability of the control link of the wind turbine itself to participate in the stabilization of system oscillations, and fails to match the low-frequency oscillation suppression and frequency support capabilities of wind power grid-connected systems. take into account

Method used

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  • Method and device for suppressing low-frequency oscillation of wind power grid-connected system
  • Method and device for suppressing low-frequency oscillation of wind power grid-connected system
  • Method and device for suppressing low-frequency oscillation of wind power grid-connected system

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Embodiment 1

[0170] The system structure of Embodiment 1 is as follows Figure 4 As shown, the wind turbine grid-connected system is based on the 10-machine 39-node model, and the synchronous machine G1 is replaced with 1,000 parallel 1.5MW doubly-fed wind turbines. Access Bus 39. The remaining parameters are shown in Tables 1-3.

[0171] Table 1 Parameters of double-fed fans

[0172]

[0173] Table 2 Rotor-converter parameters

[0174]

[0175] Table 3 Synchronizer parameters

[0176]

[0177] This embodiment sets the scene as follows: the low frequency oscillation scene is set as a small load disturbance, the disturbance time is t=5.1s, the end time is t=5.2s, the load fluctuation range is 1%, and the load position is Load 08. The primary frequency modulation scenario is set as the load fluctuation range is 5%, and the disturbance time is t=5s.

[0178] First, in order to verify the curvature compensation effect of the compensation branch, the control parameter K in the exa...

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Abstract

The invention relates to a low-frequency oscillation suppression method and device for a wind power integration system, belongs to the technical field of wind power generation systems, and solves the problem that in the prior art, low-frequency oscillation suppression and frequency supporting capacity of the wind power integration system cannot be considered at the same time. Operating state parameters of the doubly-fed fan are collected; based on the operation state parameters, calculating to obtain an energy curvature component of each energy compensation branch; determining an oscillation suppression function of a preset energy compensation branch according to the energy curvature component; determining frequency response state information of the wind power integration system based on the operation state parameters; determining a frequency support function of a preset energy compensation branch according to the frequency response state information; determining an energy compensation gain coefficient of a preset energy compensation branch according to a preset boundary condition, the oscillation suppression function and the frequency support function; and based on the energy compensation gain coefficient, controlling a preset energy compensation branch to suppress low-frequency oscillation of the wind power grid-connected system. According to the technical scheme, the power angle stability of the system can be improved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation systems, and in particular relates to a method and device for suppressing low frequency oscillation of a wind power grid-connected system. Background technique [0002] When the wind turbine has a certain inertia, the dynamic characteristics of the wind turbine will be coupled with the system, which will deepen the influence on the rotor movement characteristics of the synchronous turbine, which may lead to the aggravation of low-frequency oscillation. Therefore, for the wind power grid-connected system with virtual inertia, it is of great significance to explore measures that can ensure both power angle stability and frequency stability. [0003] At present, the existing methods qualitatively evaluate the power angle stability capability of the control link of the wind turbine grid-connected system based on the low frequency oscillation suppression effect and data measurement, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02J3/24
CPCH02J3/381H02J3/01H02J3/241H02J2203/20H02J2300/28
Inventor 马静周易介贺彤赵书强周一辰杨奇逊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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