System and method for improving FRT (fault ride-though) capability of DFIG-WT (doubly fed induction generator based wind turbine) on basis of SFCL (superconducting fault current limiter) and SMES (superconducting magnetic energy storage)

A double-fed fan and fault ride-through technology, which is applied in the field of power system and automation, can solve problems such as limited effects, and achieve the effects of suppressing fluctuations, unbalanced power and electromagnetic torque oscillation, and efficient fault ride-through support

Inactive Publication Date: 2018-09-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the superconducting magnetic energy storage device only has a significant effect on stabilizing unbalanced power, and has limited effects on limiting fault current and suppressing electromagnetic torque oscillation.

Method used

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  • System and method for improving FRT (fault ride-though) capability of DFIG-WT (doubly fed induction generator based wind turbine) on basis of SFCL (superconducting fault current limiter) and SMES (superconducting magnetic energy storage)
  • System and method for improving FRT (fault ride-though) capability of DFIG-WT (doubly fed induction generator based wind turbine) on basis of SFCL (superconducting fault current limiter) and SMES (superconducting magnetic energy storage)
  • System and method for improving FRT (fault ride-though) capability of DFIG-WT (doubly fed induction generator based wind turbine) on basis of SFCL (superconducting fault current limiter) and SMES (superconducting magnetic energy storage)

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Embodiment Construction

[0041] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] This embodiment is achieved through the following technical solutions:

[0043] like figure 1 As shown, a system based on SFCL and SMES to improve the fault ride-through capability of DFIGs is based on typical DFIGs, and a resistive superconducting fault current limiter is installed on the stator side of DFIGs. A superconducting magnetic energy storage device is installed on the DC link via a bidirectional DC / DC converter. In the figure, RSC is the rotor-side converter, and GSC is the grid-side converter.

[0044] A fault ride-through method of DFIG based on SFCL and SMES, in order to limit the stator and rotor fault current, suppress the change of DFIG terminal voltage and DC link voltage during the fault ride-through period of DFIG, and at the same time stabilize the Unbalanced power and electromagnetic torque oscillations play an active ro...

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Abstract

The invention relates to power systems and automation, in particular to a system and a method for improving FRT (fault ride-though) capability of a DFIG-WT (doubly fed induction generator based wind turbine) on the basis of an SFCL (superconducting fault current limiter) and an SMES (superconducting magnetic energy storage). The system is characterized in the on the basis of the typical DFIG-WT, aresistor type SFCL is mounted on the stator side of the DFIG-WT, and the SMES is mounted on a direct current link of the DFIG-WT through a bidirectional DC/DC converter; the resistor type SFCL is used for limiting stator fault current of the DFIG-WT, improving generator terminal voltage sag of the DFIG-WT and absorbing partial surplus active power in the DFIG-WT; the SMES is used for stabilizingunbalanced power and electromagnetic torque oscillation. According to an FRT method for the DFIG-WT on the basis of the SFCL and the SMES, fault current can be limited under symmetrical faults and asymmetrical faults, voltage change is inhibited, and unbalanced power and electromagnetic torque oscillation are stabilized. Efficient FRT support can be provided for the DFIG-WT during FRT, and transient performance of the DFIG-WT is improved.

Description

technical field [0001] The invention belongs to the technical field of power system and automation, and in particular relates to a system and method for improving the fault ride-through capability of a double-fed fan based on SFCL and SMES. Background technique [0002] With the sharp increase in electricity demand, wind power has been widely valued due to its low cost, easy maintenance, and environmental friendliness, and it occupies the vast majority of the installed capacity of renewable energy in the world. [0003] According to the classification of generator operation mode, wind power generation system can be divided into constant speed constant frequency and variable speed constant frequency wind power generation system. Compared with the constant-speed and constant-frequency power generation system, the Doubly FedInduction Generator Based Wind Turbine (Doubly FedInduction Generator Based Wind Turbine, DFIG-WT, hereinafter referred to as doubly-fed wind turbine) as a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386Y02E10/76Y02E40/60
Inventor 陈磊李国城田昕
Owner WUHAN UNIV
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