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DFIG low-voltage ride-through method based on SFCL and superconducting DVR cooperative control

A low-voltage ride-through and cooperative control technology, which is applied in the usage of superconductor elements, AC network voltage adjustment, wind power generation, etc., can solve problems such as the inability to realize ride-through, achieve the effects of improving reliability, reducing performance requirements, and prolonging service life

Active Publication Date: 2019-04-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improved control strategies currently include control strategies based on stator voltage dynamic compensation, improved vector control strategies, and new robust controller methods based on H∞ and μ analysis, but this method is limited by the excitation frequency converter. traversal may not be possible

Method used

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  • DFIG low-voltage ride-through method based on SFCL and superconducting DVR cooperative control
  • DFIG low-voltage ride-through method based on SFCL and superconducting DVR cooperative control
  • DFIG low-voltage ride-through method based on SFCL and superconducting DVR cooperative control

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Embodiment 1

[0032] A device based on SFCL and superconducting DVR cooperative control of DFIG low voltage ride through method such as figure 1 As shown, it includes DFIG, superconducting DVR, SFCL and its bypass switch K, and SFCL is respectively connected in series between phases A, B, and C on the rotor side of DFIG and phases A, B, and C on the AC side of the rotor-side converter. The circuit switch K is connected in parallel to both ends of the SFCL, and the superconducting DVR device is connected in series to the A, B, and C phases of the grid-connected busbars through three single-phase series transformers.

[0033] The cooperative control method mainly realizes the selection of the protection mode of the DFIG low-voltage ride-through scheme during the power grid fault, and the selection process is as follows: figure 2 shown. The protection mode switching process is as follows:

[0034] (1) After the power grid fault occurs, the superconducting DVR starts to start after detecting...

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Abstract

The invention discloses a DFIG low-voltage ride-through method based on SFCL and superconducting DVR cooperative control, and belongs to the technical field of double-fed fan equipment. According to the invention, a system of the DFIG low-voltage ride-through method based on SFCL and superconducting DVR cooperative control is established. When the voltage of the power grid sags, the DFIG detects the sag amplitude of the voltage and the current amplitude of a rotor. According to the sag amplitude range of the voltage and the current amplitude range of the rotor, the DFIG respectively works in the superconducting fault current limiter protection mode, the superconducting DVR voltage compensation mode and the superconducting fault current limiter-superconductive DVR cooperative protection mode under the action of a delay module. According to the invention, different action characteristics of the superconducting fault current limiter and the superconducting DVR on improvement of DFIG low-voltage ride-through capability are utilized. By coordinating the switching operation states of the two devices, the reliability degree of DFIG low-voltage ride through is greatly improved. Compared with the single action condition of a single superconducting device, the performance requirement of each superconducting device is reduced, so that the service life of the whole device is prolonged.

Description

technical field [0001] The invention relates to the technical field of double-fed fan equipment, in particular to a DFIG low-voltage ride-through method based on the cooperative control of SFCL and superconducting DVR. Background technique [0002] With the continuous development of wind power technology, the scale and capacity of wind farms are getting larger and larger, and the proportion of wind farms in the entire power system is also increasing, so their impact on the system is becoming more and more significant. When the system fails and causes a voltage sag, the output power of the doubly-fed induction generator (DFIG) cannot be transmitted to the grid, so the energy can only be stored in the DFIG. At this time, strong electromagnetic transient oscillations will occur inside the DFIG, the stator and rotor currents will increase sharply, and the DC side voltage will also change sharply, which will cause serious harm to the DFIG itself. In the past, when the capacity o...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/12H02J3/48
CPCH02J3/12H02J3/386H02J3/48Y02E10/76Y02E40/60
Inventor 郑子萱肖先勇汪颖黄纯军李长松
Owner SICHUAN UNIV