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A Calculation Method for the Transient Current of the Rotor of a Doubly-fed Wind Turbine Generator

A technology of wind power generators and transient currents, which is applied in the direction of wind power generation, control of generators, motor generator control, etc., and can solve the problem of less analysis of rotor transient currents

Active Publication Date: 2018-05-22
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is less analysis of the rotor transient current that directly causes damage to the rotor-side converter after the three-phase voltage surge

Method used

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  • A Calculation Method for the Transient Current of the Rotor of a Doubly-fed Wind Turbine Generator
  • A Calculation Method for the Transient Current of the Rotor of a Doubly-fed Wind Turbine Generator
  • A Calculation Method for the Transient Current of the Rotor of a Doubly-fed Wind Turbine Generator

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example 1

[0054] This embodiment adopts a certain 2MW doubly-fed wind power generator, and the actual parameters are as follows: Stator resistance R s =9.18mΩ, rotor resistance R r =3.24mΩ, stator leakage inductance L sσ =0.3578mH, rotor leakage inductance L rσ =0.3278mH, excitation inductance L m =13.82mH, motor synchronous speed 1500rpm, rated phase voltage V se = 400V. The doubly-fed fan operates at a wind speed of 10m / s. When it runs for 6s, the grid voltage suddenly rises to 1.3pu, and the sudden rise fault lasts for 1s and is cut off.

[0055] At this time, according to formula 9, the maximum value i of the transient current amplitude induced by the rotor can be obtained rmax :

[0056]

[0057] Under the above working conditions, the rotor current curve obtained by PSCAD simulation is as follows: image 3 As shown, where the abscissa is the simulation time, and the ordinate is the current amplitude.

[0058] Depend on image 3 The simulated rotor current curve shown s...

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Abstract

The invention provides a double fed wind driven generator rotor transient current calculating method. The method includes the following steps that: a transient mathematical model of a double fed induction generator in power grid voltage abrupt rise is established in a synchronous speed rotation coordinate system; a stator and rotor transient current equation in power grid voltage abrupt rise is calculated according to the transient mathematical model; a stator flux linkage, a stator flux linkage equation in rotor open circuiting and the equation of a rotor flux linkage inducted from a stator side are calculated for a set voltage abrupt rise switching-in mechanism; and an expression of rotor transient current which is generated through induction due to the abrupt change of the electric quantity at the stator side after power grid voltage symmetrical abrupt rise is obtained according to the stator and rotor transient current equation in power grid voltage abrupt rise, the stator flux linkage, the stator flux linkage equation in rotor open circuiting and the equation of the rotor flux linkage inducted from the stator side. The method of the invention has the advantages of simple calculation process and accurate result, and can provide a reliable data base for the setting work of the power protection system of the double fed induction generator.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for calculating the transient current of a doubly-fed wind power generator rotor. Background technique [0002] Among various types of wind turbines, the double fed asynchronous generator (Double Fed Induction Generator, DFIG) is currently one of the mainstream models of megawatt-scale wind turbines. Since the generator stator of the doubly-fed wind turbine is directly connected to the grid, the wind turbine is very sensitive to grid faults. When the power grid voltage rises suddenly and fails, because the flux linkage does not change suddenly, there will be DC components and negative sequence components in the stator flux linkage (which will only occur during asymmetrical faults), and they will produce a large slip relative to the high-speed rotating rotor. Therefore, a large transient current is induced in the rotor circuit, which causes the surge curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/10H02P21/14H02J3/38H02P101/15
CPCY02E10/76
Inventor 刘少宇常静白恺刘汉民宋鹏朱斯刘京波
Owner STATE GRID CORP OF CHINA