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Stability analysis method based on doubly-fed wind power plant grid-connected system output impedance model

A doubly-fed wind farm, output impedance technology, applied in wind power generation, single grid parallel feeding arrangement, etc., can solve problems such as stability analysis of wind farm operating conditions, and achieve the effect of improving stability

Pending Publication Date: 2020-04-10
STATE GRID GASU ELECTRIC POWER RES INST +4
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Problems solved by technology

[0004] Currently, the impedance analysis method of doubly-fed wind turbines is mostly analyzed on a single machine, and the impedance analysis method of multi-machine system does not make a stability analysis of various coefficients and operating conditions in the wind farm.

Method used

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  • Stability analysis method based on doubly-fed wind power plant grid-connected system output impedance model
  • Stability analysis method based on doubly-fed wind power plant grid-connected system output impedance model
  • Stability analysis method based on doubly-fed wind power plant grid-connected system output impedance model

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Embodiment Construction

[0056] The structure and beneficial effects of the present invention will be further described below in conjunction with the accompanying drawings.

[0057] As shown in the accompanying drawing, a stability analysis method based on the output impedance model of the DFIG wind farm grid-connected system uses the small-signal disturbance analysis method to establish the wind turbine through the vector control small-signal model of the DFIG considering the current loop and The small-signal output impedance models of the phase-locked loop and the power loop are aggregated to obtain the small-signal output impedance model of the double-fed wind farm, and then the small-signal impedance model of the power grid is established. Such as figure 1 Shown is a doubly-fed wind farm grid-connected system.

[0058] The vector control model of double-fed fan is as follows: figure 2 As shown, the specific modeling and analysis process of the DFIG grid-connected system is as follows;

[0059]...

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Abstract

The invention relates to the technical field of new energy power generation grid-connected stability control, in particular to a stability analysis method based on a doubly-fed wind power plant grid-connected system output impedance model. According to the method, a doubly-fed fan small signal output impedance model by considering three parts of a phase-locked loop, a current loop and a power loopis established under a synchronous rotating coordinate system to obtain a synchronous rotating coordinate system doubly-fed wind power plant grid-connected small signal impedance model through the doubly-fed fan output impedance model; a power grid small signal impedance model is established under the synchronous rotating coordinate system; the ratio of the output impedance of the doubly-fed windpower plant to the impedance of the power grid is calculated, and the stability of the doubly-fed wind power plant grid-connected system is determined according to a generalized Nyquist criterion. The stability analysis method can be used for analysis of the stability of the doubly-fed wind power plant grid-connected system and a powerful theoretical basis is provided for analyzing subsynchronous / super-synchronous oscillation caused by the fact that a large-scale wind power plant is connected into a power grid.

Description

technical field [0001] The invention relates to the technical field of new energy power generation grid-connected stability control, in particular to a stability analysis method based on an output impedance model of a doubly-fed wind farm grid-connected system. Background technique [0002] The issue of grid-connected and stable operation of large-scale wind farms is a hot research topic at home and abroad. Due to the increase of wind power penetration rate and the fact that most new energy power plants in my country are located in remote areas, the transmission lines are longer, which increases the equivalent electrical impedance, and the power grid presents a weak grid trend, which will lead to the interaction between the doubly-fed wind power grid-connected system and the grid And cause serious stability problems. [0003] Due to the sub / super synchronous oscillation caused by new energy grid connection, the main analysis methods are impedance analysis and modal analysis....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 刘福潮何欣拜润卿常鸿史玉杰陈仕彬刘文飞张旭军张刚
Owner STATE GRID GASU ELECTRIC POWER RES INST
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