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A Method for Suppressing Grid-connected Subsynchronous Oscillation of Doubly-fed Wind Farm

A subsynchronous oscillation, wind farm technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve problems such as subsynchronous oscillation, and achieve the effects of improving stability, suppressing interactions, and reducing risks

Active Publication Date: 2021-10-22
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID NINGXIA ELECTRIC POWER COMPANY +1
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  • Description
  • Claims
  • Application Information

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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  • A Method for Suppressing Grid-connected Subsynchronous Oscillation of Doubly-fed Wind Farm
  • A Method for Suppressing Grid-connected Subsynchronous Oscillation of Doubly-fed Wind Farm
  • A Method for Suppressing Grid-connected Subsynchronous Oscillation of Doubly-fed Wind Farm

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Embodiment Construction

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] Such as image 3 As shown, a method for suppressing the grid-connected subsynchronous oscillation of a double-fed wind farm, the steps are as follows: S1, determine the frequency range of the wind farm grid-connected subsynchronous oscillation.

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

[0039] S1.2. According to the...

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Abstract

The invention discloses a method for suppressing the grid-connected subsynchronous oscillation of a double-fed wind farm. First, the frequency range in which subsynchronous oscillation may occur is determined according to the numerical model of the grid-connected double-fed wind farm; and then the phase compensation technology is used to design the corresponding Finally, the designed band-stop filter is connected to the current feedback link of the current inner loop of the double-fed fan rotor side converter. The method of the invention can effectively suppress the subsynchronous control interaction of the doubly-fed wind generator set, and further have an obvious inhibitory effect on the grid-connected subsynchronous oscillation of the doubly-fed wind farm, and has important practical significance for ensuring the safe and stable operation of the power system.

Description

technical field [0001] The invention belongs to the field of electric power systems, relates to the field of stability of electric energy transmitted outside the grid of a doubly-fed wind farm, and in particular relates to a method for suppressing sub-synchronous oscillation of a doubly-fed wind farm grid-connected. Background technique [0002] At present, doubly-fed wind turbines have been widely used in the field of new energy power generation, and doubly-fed wind farms have become the main way to achieve large-scale development and utilization of wind energy. When doubly-fed wind farms are connected to the grid, the power transmission line series compensation technology is often used to shorten the electrical distance, improve the power transmission capacity, and improve the stability of the power system. However, due to the particularity of the control and structure of the doubly-fed wind turbine, this large-scale, long-distance, point-to-network transmission of power t...

Claims

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Application Information

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Patent Type & Authority Patents(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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