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A control method of DFIG shafting oscillation based on virtual inertia control

A technology of virtual inertia and control method, applied in reducing/preventing power oscillation, AC network circuit, wind power generation, etc., can solve problems such as reduction of equivalent inertia of power system, and achieve the effect of ensuring safe and stable operation

Active Publication Date: 2018-12-18
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Application Information

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Problems solved by technology

The second point: the connection of large-scale wind farms to the grid will cause the problem of the reduction of the equivalent inertia of the power system. With the increase of the scale of wind farms, this problem becomes increasingly prominent

Method used

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  • A control method of DFIG shafting oscillation based on virtual inertia control
  • A control method of DFIG shafting oscillation based on virtual inertia control
  • A control method of DFIG shafting oscillation based on virtual inertia control

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Embodiment

[0036] Such as figure 1 As shown, the present invention relates to a control method of DFIG shaft system oscillation based on virtual inertia control, which includes the following steps:

[0037] Step 1. Build a linearized system model of a five-machine two-area system with a doubly-fed wind farm.

[0038] Step 2. Use Lyapunov's first method to obtain the static stable operating point of the linearized system model, and obtain the shafting oscillation frequency, left / right eigenvectors, and eigenvalues ​​of the linearized system model through eigenvalue analysis at the static stable operating point Characteristic attribute values ​​such as damping ratio.

[0039] For the i-th pair of conjugate characteristic roots λ i =σ i ±jω i , Use its left and right eigenvectors and other characteristic attributes to perform modal analysis to obtain participation factors, and identify shafting oscillation modes based on the participation factors.

[0040] Step 3. Introduce virtual inertia control...

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Abstract

The invention relates to a control method of DFIG shafting oscillation based on virtual inertia control, which comprises the following steps: S1, establishing a linearized system model containing a doubly-fed wind farm; S2, obtaining the characteristic attribute value of the linearized system model, obtaining the participation factor by using the characteristic attribute value to the conjugate characteristic root, and identifying the shafting oscillation mode according to the participation factor; 3, introducing virtual inertia control, changing values of the virtual inertia control parameters, and obtaining root locus curves of the shafting oscillation mode and the change trend of the damping ratio under different values; and S4: acquiring the suppression effect of the virtual inertia control parameters on the shafting oscillation of the doubly-fed fan in a certain range according to the changing trend, adjusting the appropriate virtual inertia control parameters, and realizing the effective DFIG shafting oscillation control. Compared with the prior art, the invention has the advantages of increasing the inertia of the electric power system, ensuring the safe and stable operationof the fan, and the like.

Description

Technical field [0001] The invention relates to the technical field of grid-connected shaft oscillations of doubly-fed wind turbines, in particular to a method for controlling DFIG shaft oscillations based on virtual inertia control. Background technique [0002] In recent years, as a renewable clean energy, wind power has developed rapidly due to its low power generation cost and abundant resource reserves. However, after large-scale wind farms are connected to the grid, they will bring severe challenges to the safe and stable operation of the grid. Among them, the first point is that the drive shaft system of the doubly-fed wind turbine is a flexible connection system. Under small wind speed disturbances, the dynamic process of the Doubly Fed Induction Generator (DFIG) shaft system is presented in the form of oscillation. Reflected in the output power of the doubly-fed wind turbine, since the oscillation frequency is low (about 2 Hz), which is close to the frequency of the low...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02J3/24
CPCH02J3/386H02J3/24H02J3/48H02J2203/20Y02E10/76
Inventor 边晓燕刘洁杜中浩杨帅帅王振兴丁炀李东东
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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