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Method used for inhibiting double-fed wind power plant grid connection subsynchronous oscillation

A sub-synchronous oscillation and wind farm technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve sub-synchronous oscillation and other problems, achieve the effects of sub-synchronous oscillation suppression, ensure smooth operation, and reduce risks

Active Publication Date: 2018-10-09
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +1
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AI Technical Summary

Problems solved by technology

Among them, the subsynchronous control interaction (SSCI) involves the control of the rotor-side converter and the inductive relationship between the stator and the rotor, which leads to the subsynchronous oscillation problem when the grid-connected doubly-fed wind farm suffers from the subsynchronous interference of the grid.

Method used

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  • Method used for inhibiting double-fed wind power plant grid connection subsynchronous oscillation
  • Method used for inhibiting double-fed wind power plant grid connection subsynchronous oscillation
  • Method used for inhibiting double-fed wind power plant grid connection subsynchronous oscillation

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Embodiment Construction

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0037] Such as image 3 As shown, a method for suppressing the grid-connected sub-synchronous oscillation of a doubly-fed wind farm includes the following steps: S1, determine the frequency range of the grid-connected sub-synchronous oscillation of the wind farm.

[0038] Specifically: S1.1, according to the parameters and working conditions of the wind farm, establish a wind farm numerical simulation model, such as figure 1 Shown.

[0039]...

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Abstract

The invention discloses a method used for inhibiting double-fed wind power plant grid connection subsynchronous oscillation. First, according to a numerical model of a grid-connected double-fed wind power plant, the frequency range of subsynchronous oscillation that may occur is determined. Then a phase compensation technology is employed for designing a corresponding band rejection filter. Finally, the designed band rejection filter is connected to a current feedback link of converter current inner loop of a rotor side of a double-fed fan. According to the invention, subsynchronous control mutual action of the double-fed wind power plant can be inhibited effectively, so that a distinct inhibition effect on double-fed wind power plant grid connection subsynchronous oscillation is realized.The method has significant realistic meaning in ensuring safe and stable operation of a power system.

Description

Technical field [0001] The invention belongs to the field of electric power systems, and relates to the field of stability of the grid-connected external electric energy of a doubly-fed wind farm, and in particular to a method for suppressing the sub-synchronous oscillation of the doubly-fed wind farm in the grid. Background technique [0002] At present, doubly-fed wind generators have been widely used in the field of new energy power generation. The grid-connected power transmission of doubly-fed wind farms has become the main way to achieve large-scale development and utilization of wind energy. Doubly-fed wind farms often use transmission line series compensation technology for grid-connected power transmission to shorten electrical distance, increase power transmission capacity, and improve power system stability. However, because of the particularity of the control and structure of the doubly-fed wind turbine, this large-scale, long-distance, point-to-grid method of sending...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/386H02J3/24H02J2203/20Y02E10/76
Inventor 梁剑李四勤焦龙李旭涛
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY
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