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A Virtual Inertial Control Method Based on Wind Power Tracking Adaptive Adjustment for Doubly-fed Wind Turbines

A doubly-fed wind turbine, virtual inertia technology, applied in wind power generation, control systems, control generators, etc., can solve the problems of difficulty in the practical application of the maximum wind power tracking curve, ignoring the speed adjustment process of doubly-fed wind turbines, etc. The effect of engineering realization, less control parameters and simple control structure

Active Publication Date: 2018-02-09
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Although this method can overcome the influence of maximum wind power tracking on additional virtual inertial control, this method ignores the speed adjustment process of the DFIG to achieve maximum wind power tracking. Therefore, the correction method of the maximum wind power tracking curve studied has practical application difficulties

Method used

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  • A Virtual Inertial Control Method Based on Wind Power Tracking Adaptive Adjustment for Doubly-fed Wind Turbines
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  • A Virtual Inertial Control Method Based on Wind Power Tracking Adaptive Adjustment for Doubly-fed Wind Turbines

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Embodiment Construction

[0033] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

[0034] as attached figure 1 As shown, the generator rotor of the grid-connected doubly-fed wind turbine is coupled with the wind turbine rotor through the gearbox, and at the same time, the three-phase symmetrical winding of the rotor is passed by the doubly-fed induction generator DFIG rotor-side converter RSC and the grid-side converter The bidirectional pulse width modulation converter composed of GSC is connected to the grid, and the three-phase symmetrical winding of the stator is directly connected to the grid. P mThe mechanical power input to DFIG for the fan; ω r is the rotor angular velocity of the wind turbine; J m is the inherent mechanical moment of inertia of the wind turbine rotor; S=(ω s -ω r ) / ω s , for ω r Electrical angular velocity ω synchronous with the grid s (ω s =2πf s ...

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Abstract

The invention relates to a wind power tracking adaptive adjustment-based virtual inertia control method for double-wind-feeding generation set. The research on a virtual inertia control strategy of the wind generation set has an important role in improving the dynamic stability of the frequency of a wind power grid-connected system. The method comprises the following steps: firstly, analyzing an implementing theory of maximum wind power tracking based on a rotating speed controller of the double-fed wind generation set; then deducting a virtual inertia expression of the double-fed wind generation set based on a rotor motion equation by constructing connection between the frequency of a power grid and the kinetic energy of a rotor of the double-fed wind generation set, wherein at the same time, a maximum wind power tracking curve linear proportion adjustment-based rotating speed adjustment method for the double-wind-feeding generation set according to a secondary fitting function of a maximum wind power tracking curve; and finally, providing a wind power tracking adaptive adjustment-based virtual inertia control strategy for the double-wind-feeding generation set on the basis of the research, and verifying the validness of the control method by constructing a simulation model of the wind power grid-connected system.

Description

technical field [0001] The present invention relates to a frequency inertia control strategy of a doubly-fed wind generator set in a power system, in particular to a method of using the kinetic energy of the doubly-fed wind turbine rotor to construct its virtual moment of inertia related to the frequency of the power grid to improve the frequency inertia characteristics of the wind power system, and to A control method for improving the dynamic characteristics of the frequency response of a wind power system. Background technique [0002] The development of wind power technology based on doubly-fed induction power generation and large-scale grid connection make it an increasingly important new power source. The doubly-fed wind turbine uses the rotor-side bidirectional converter to achieve output active power, reactive power decoupling control and maximum wind energy capture, and at the same time decouples the rotor rotational kinetic energy from the grid frequency, so that i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02P9/00H02P9/10H02P101/15
CPCY02E10/76
Inventor 毛荀彭晓涛谷志华张彬张旭昶林哲敏谢毓广占勇夏俊丽
Owner STATE GRID CORP OF CHINA
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