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Doubly-fed wind turbine generator hybrid fault ride-through method

A double-fed wind turbine, fault ride-through technology, applied in wind power generation, generator control, motor generator control, etc., can solve problems such as converter damage, achieve support voltage recovery, prevent reactive power absorption, and stabilize stability. Effect

Inactive Publication Date: 2016-05-04
SHANXI DATONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the grid voltage drops, due to the sudden change of the stator flux, the appearance of the DC component will cause overcurrent in the rotor winding, resulting in damage to the converter

Method used

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  • Doubly-fed wind turbine generator hybrid fault ride-through method
  • Doubly-fed wind turbine generator hybrid fault ride-through method
  • Doubly-fed wind turbine generator hybrid fault ride-through method

Examples

Experimental program
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Effect test

Embodiment

[0040] This embodiment provides a hybrid fault ride-through method for double-fed wind turbines. The specific application environment is based on the simulation software PSCAD / EMTDC; the parameters of the double-fed induction motor used in the simulation are: rated power P n =2MW, rated voltage U n =690V, rated frequency f=50Hz, stator resistance R s =0.00488pu, stator leakage inductance L ls =0.1386pu, rotor resistance R r =0.00549pu, rotor leakage inductance L lr =0.1493pu, mutual inductance L m=3.9527pu, inertial time constant H=3.5s, turn-to-turn ratio is 0.45; simulation conditions are: wind speed is 13.5m / s; voltage drops 80%; fault occurs at 8s, duration is 625ms. The converter of a doubly-fed wind turbine is usually composed of two parts, namely the rotor-side converter and the grid-side converter, which are collectively referred to as the converter.

[0041] In this embodiment, the current limiting circuit connected in series to the stator winding of the double-f...

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PUM

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Abstract

The invention provides a doubly-fed wind turbine generator hybrid fault ride-through method. According to the method, fault ride-through capability of a doubly-fed wind turbine generator can be improved through connecting in series with a protection circuit of a doubly-fed induction motor stator winding, connecting in parallel with a DC unloading circuit of a converter DC bus and coordination control of a doubly-fed induction motor rotor in a current fault control mode. Through the method, blocking a rotor side converter is not necessary, the doubly-fed induction motor is not out of control, too-fast increase of a rotating speed in a fault period of a system can be inhibited, the electric network voltage is supported, after the proper rotor current fault control strategy is employed, start frequency of a hardware protection circuit is reduced, and thereby low voltage ride-through transient performance of the doubly-fed wind turbine generator is improved.

Description

technical field [0001] The invention relates to the field of wind power protection, in particular to a hybrid fault ride-through method for double-fed wind turbines. Background technique [0002] In order to cope with the energy crisis and environmental degradation, countries around the world are actively promoting the development and utilization of renewable energy, especially wind power has received widespread attention and rapid development. The large-scale application of wind power can not only alleviate the energy crisis, but also reduce the environmental problems caused by the use of conventional energy, thereby reducing the emission of carbon dioxide gas. However, the integration of large-scale wind power into the grid has brought great challenges to the safe operation of the grid. For this reason, the new grid guidelines require that wind turbines must have low voltage ride-through capability. In fact, all wind turbines have low voltage ride through problems, but d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02P21/00H02P101/15
CPCH02J3/386H02P21/00Y02E10/76
Inventor 凌禹
Owner SHANXI DATONG UNIV
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