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Wind power converter low voltage ride through control method, device, equipment and storage medium

A low-voltage ride-through, wind power converter technology, applied in circuit devices, wind power generation, electrical components, etc., can solve problems such as large grid impact and adverse grid voltage recovery

Active Publication Date: 2020-10-30
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in practical applications, voltage symmetric drop and asymmetric drop occur alternately, which will cause the reactive current output by the wind power converter to jump back and forth between the rated current and 40% of the rated current, which has a large impact on the power grid and is not Conducive to grid voltage recovery

Method used

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  • Wind power converter low voltage ride through control method, device, equipment and storage medium
  • Wind power converter low voltage ride through control method, device, equipment and storage medium
  • Wind power converter low voltage ride through control method, device, equipment and storage medium

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Embodiment 1

[0035] figure 1 A schematic flowchart of a method for controlling low voltage ride through of a wind power converter provided by an embodiment of the present invention is shown. Wind power converter low voltage ride through control methods may include:

[0036] S101: Monitor the grid-connected point voltage of the wind farm in real time.

[0037] S102: Determine the positive sequence component and negative sequence component of the grid-connected point voltage.

[0038] S103: Control the wind power converter to enter the low voltage ride through mode according to the positive sequence component of the grid-connected point voltage.

[0039] S104: According to the positive-sequence component and negative-sequence component of the grid-connection point voltage, determine the value of the symmetrical reactive current provided by the wind power converter to the grid-connection point during the low voltage ride through period.

[0040] S105: In the low voltage ride through mode, ...

Embodiment 2

[0091] In an embodiment of the present invention, the wind power converter can also be controlled to end the low voltage ride-through according to the positive sequence component of the grid-connected point voltage.

[0092] Exemplarily, assuming that the positive sequence component of the grid-connected point voltage during the low-voltage ride-through period is greater than 0.9 times the rated voltage output by the wind power converter and lasts for 50 ms, the wind power converter is controlled to end the low-voltage ride-through.

[0093] In an embodiment of the present invention, the wind power converter low voltage ride through control method of the embodiment of the present invention may further include: during the low voltage ride through period, according to the positive sequence component of the grid connection point voltage during the low voltage ride through period, the grid connection point The drop amplitude of the positive sequence component of the voltage and the...

Embodiment 3

[0100] Corresponding to the above method embodiments, the embodiments of the present invention also provide a low voltage ride through control device for wind power converters.

[0101] like Image 6 as shown, Image 6 A schematic structural diagram of a low-voltage ride-through control device for a wind power converter provided by an embodiment of the present invention is shown. The wind power converter low voltage ride through control device may include:

[0102] The monitoring module 601 is used for real-time monitoring of the grid-connected point voltage of the wind farm.

[0103] The first determining module 602 is configured to determine positive sequence components and negative sequence components of the grid-connected point voltage.

[0104] The first control module 603 is configured to control the wind power converter to execute the low voltage ride through mode according to the positive sequence component.

[0105] The second determination module 604 is configure...

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PUM

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Abstract

The embodiment of the invention discloses a wind power converter low voltage crossing control method, device, device and a storage medium. The method comprises the following steps of: real-time monitoring the grid-connected point voltage of a wind farm; Determining the positive sequence component and the negative sequence component of the grid-connected point voltage; Controlling the wind power converter to enter the low voltage crossing mode according to the positive sequence component; according to the positive sequence component and the negative sequence component, the value of the symmetrical reactive current supplied by the wind power converter to the grid-connected point during the low voltage crossing period is determined. A low voltage ride-through mode is perform in which that reactive current is supplied by the wind convert according to the determined value of the symmetrical reactive current. A low voltage traverse control method according to an embodiment of that present invention As that device, the device and the storage medium can inject symmetrical three-phase current into the power grid under the condition that the voltage sag of the grid-connected electricity is symmetrical or asymmetrical, the device, the device and the storage medium can effectively prevent the wind power convert from frequently switching between the asymmetrical reactive power control strategy and the symmetrical reactive power control strategy, thereby facilitating the voltage restoration of the power grid.

Description

technical field [0001] The present invention relates to the technical field of wind power generation, in particular to a low voltage ride through control method, device, equipment and storage medium of a wind power converter. Background technique [0002] Low voltage ride through means that when the grid failure or disturbance causes the voltage drop at the grid-connected point of the wind farm, within a certain range of voltage drop, the wind turbine can operate uninterruptedly connected to the grid. The low voltage ride through technology can reduce the number of repeated grid connection of the power generation system when it fails, reduce the impact on the power grid, maintain the power generation operation capacity, and reduce grid fluctuations. [0003] When the grid fails, an asymmetric grid voltage is usually formed at the grid connection point. Under such unsymmetrical grid voltage conditions, the current injected into the grid by the wind power converter will be no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/50
CPCH02J3/386H02J3/50Y02E10/76
Inventor 王海龙乔元
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD