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Fault ride-through method of doubly-fed unit based on rotor string resistance

A technology of rotor series resistance, double-fed unit, applied in the direction of single-grid parallel feeding arrangement, etc., can solve the problems of deterioration of unit speed stability, unfavorable for unit fault ride-through, etc., to prevent reactive power absorption, stabilize stability, solve problems The effect of motor runaway

Active Publication Date: 2015-12-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 2) Under the above operating conditions, the unit speed stability deteriorates, and absorbs a large amount of reactive power to the grid, which is not conducive to the fault ride-through of the unit;

Method used

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  • Fault ride-through method of doubly-fed unit based on rotor string resistance
  • Fault ride-through method of doubly-fed unit based on rotor string resistance
  • Fault ride-through method of doubly-fed unit based on rotor string resistance

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0038] This embodiment provides a DFIG fault ride-through method based on the rotor string resistance, and its specific application environment is based on the simulation software PSCAD / EMTDC; the parameters of the DFIG 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 =3.952...

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Abstract

The invention provides a double-fed unit fault ride-through method based on rotor series resistance. The method comprises the following step: enhancing the low voltage ride-through capability of a double-fed unit through coordination control of a resistance circuit connected in series to a rotor winding of the double-fed unit, a DC unloading circuit connected in parallel to the DC side bus of a converter, and the control strategy of a rotor side converter improved on the basis of a traditional vector control technology. According to the invention, the rotor side converter is not required to be blocked, and a double-fed motor is not out of control, therefore, the rotating speed of a system can be stabilized, the fast increasing of the rotating speed of the system in the failure period is inhibited, the network voltage is supported, and the starting opportunity of a hardware protection circuit can be reduced by adopting the proper improved control strategy, thereof, the low voltage ride-through transient performance of a double-fed wind turbine generator is enhanced.

Description

technical field [0001] The invention relates to the field of wind power protection, in particular to a fault ride-through method for a doubly-fed unit based on rotor string resistance. 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. Among them, wind power generation has become the focus of scientific research personnel and commercial enterprises. This is because wind energy is a reliable, unlimited, renewable source of electricity supply. 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. [0003] However, the integration of large-scale wind power into the grid has brought great challenges to grid operation. In order to connect large-scale wind power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 蔡旭凌禹贾锋
Owner SHANGHAI JIAO TONG UNIV
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