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Method and device for judging stability of grid-connected sub-synchronous oscillation of double-fed induction generator

A doubly-fed wind turbine, sub-synchronous oscillation technology, applied in the direction of circuit device, wind power generation, reducing/preventing power oscillation, etc., can solve the problem that the stability index cannot be given

Active Publication Date: 2018-07-31
STATE GRID LIAONING ELECTRIC POWER RES INST +2
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Problems solved by technology

The existing Nyquist criterion is only suitable for the stability analysis of simplified systems (equivalent stand-alone infinite systems), and can only give qualitative results (stable or unstable), but cannot give quantitative stability indicators

Method used

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  • Method and device for judging stability of grid-connected sub-synchronous oscillation of double-fed induction generator
  • Method and device for judging stability of grid-connected sub-synchronous oscillation of double-fed induction generator
  • Method and device for judging stability of grid-connected sub-synchronous oscillation of double-fed induction generator

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Embodiment Construction

[0062] Various exemplary embodiments, features, and aspects of the invention will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures indicate functionally identical or similar elements. While various aspects of the embodiments are shown in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0063] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments.

[0064] In addition, in order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. It will be understood by those skilled in the art that the present invention may be practiced without certain of the specific details. In some instances, methods, means, components and circuits well kn...

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Abstract

The invention relates to a method and device for judging the stability of grid-connected sub-synchronous oscillation of a double-fed induction generator. The method comprises the steps of setting positive sequence harmonic voltage and positive sequence harmonic current of a stator of the double-fed induction generator according to stator phase-a voltage, stator phase-a current and rotor phase-a current of the double-fed induction generator; determining an output voltage expression of a current regulation link according to the positive sequence harmonic voltage and the positive sequence harmonic current; establishing a stator-side impedance analytical expression of the double-fed induction generator according to the positive sequence harmonic voltage, the positive sequence harmonic currentand the output voltage expression so as to obtain double-fed induction generator-side impedance characteristics; building a grid-side impedance model so as to obtain grid-side impedance characteristics; establishing a characteristic function equation of the double-fed induction generator-side impedance characteristics and the grid-side impedance characteristics; and solving the characteristic function equation so as to quantitatively judge the oscillation frequency and damping level of the double-fed induction generator. The oscillation frequency and damping level of can be quantitatively judged according to the method and device.

Description

technical field [0001] The invention relates to the field of subsynchronous oscillation analysis of new energy power systems, in particular to a method and device for judging the stability of grid-connected subsynchronous oscillation of a doubly-fed wind turbine. Background technique [0002] Double-fed wind turbine (DFIG, Double-Fed Induction Generator) has been widely used as a clean energy power generation technology. After it is integrated into the grid, subsynchronous power oscillation will occur under some special conditions, which will seriously threaten the grid and wind power. The safety of the unit, such accidents have occurred frequently at home and abroad. [0003] In order to solve the above problems, the following methods have been studied. [0004] The state-space analysis method is based on the small-signal state-space model of the interconnected system in the time domain, and analyzes the root locus of the model to judge the stability of the interconnected ...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/386H02J2203/20Y02E10/76
Inventor 葛维春张艳军高凯葛延峰李铁刘凯钱华东梁新艳赵伟华毕天姝张鹏
Owner STATE GRID LIAONING ELECTRIC POWER RES INST
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