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Method and system for suppressing double frequency voltage of direct drive fan with asymmetric fault DC bus

A DC bus voltage and DC bus technology, applied in the direction of multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, AC network circuit, etc., can solve the problem that the negative sequence current cannot be adjusted freely, and the full-power wind power cannot be controlled Problems such as negative sequence impedance of the unit to achieve the effect of improving stability

Active Publication Date: 2021-12-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this control method fixes the negative-sequence current output by the grid-side converter at a certain value, so that the negative-sequence current cannot be adjusted freely, that is, the negative-sequence impedance of the full-power wind turbine cannot be controlled.

Method used

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  • Method and system for suppressing double frequency voltage of direct drive fan with asymmetric fault DC bus
  • Method and system for suppressing double frequency voltage of direct drive fan with asymmetric fault DC bus
  • Method and system for suppressing double frequency voltage of direct drive fan with asymmetric fault DC bus

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Effect test

Embodiment 1

[0031] In one or more implementations, a method for suppressing double frequency voltage of direct drive wind turbine asymmetric fault DC bus is disclosed, including:

[0032] Adjust the negative sequence current of the machine-side converter so that the power fluctuations from the machine-side converter are equal to the power fluctuations of the grid-side converter, so that the grid-side fluctuating power is transparently transmitted to the rotor through the machine-side converter , to ensure that the DC bus voltage will not be affected by the double frequency fluctuation power when an asymmetric fault occurs in the power grid.

[0033] The implementation process of the method of the present invention will be described in detail below.

[0034] 1. Fluctuation of DC bus voltage under asymmetric conditions

[0035] (1) Double frequency fluctuating power

[0036] The structure of the direct drive fan is as follows: figure 1 As shown, the permanent magnet synchronous motor gen...

Embodiment 2

[0135] In one or more embodiments, a direct-drive wind turbine asymmetrical fault DC bus double frequency voltage suppression system is disclosed, including:

[0136] A device used to adjust the negative-sequence current of the machine-side converter so that the power fluctuations from the machine-side converter are equal to the power fluctuations of the grid-side converter; The converter is transparently transmitted to the rotor to ensure that the DC bus voltage will not be affected by the double frequency fluctuation power when an asymmetrical fault occurs in the power grid.

Embodiment 3

[0138] In one or more embodiments, a terminal device is disclosed, including a server, the server includes a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor executes the The program realizes the double frequency voltage suppression method of the asymmetric fault DC bus of the direct drive fan in the first embodiment. For the sake of brevity, details are not repeated here.

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Abstract

The invention discloses a method and system for suppressing double-frequency voltage of a direct-drive wind turbine asymmetrical fault DC bus bar, including: adjusting the negative sequence current of the machine-side converter so that the power fluctuation emitted by the machine-side converter and the grid-side converter The power fluctuations of the converters are equal, so that the grid-side fluctuating power is transparently transmitted to the rotor through the machine-side converter, ensuring that the DC bus voltage will not be affected by the double-frequency fluctuating power when an asymmetrical fault occurs in the power grid. Beneficial effects of the present invention: the present invention transparently transmits double-frequency power fluctuations to the rotor, thereby ensuring that the DC bus voltage will not be affected by double-frequency fluctuation power when an asymmetric fault occurs in the power grid, and improving the stability of the full-power fan sex.

Description

technical field [0001] The invention relates to the technical field of power grid asymmetry faults, in particular to a method and system for suppressing double-frequency voltage of a direct-drive fan with an asymmetric fault DC bus. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] After the full-power wind turbine is connected to the system, due to the isolation of the DC bus, the decoupling between the rotor and the network is realized. All fluctuations in the grid will only affect the DC bus and will not affect the rotor. When an asymmetrical fault occurs in the power grid, the positive and negative sequence voltage and current will generate double-frequency fluctuating power, which will act on the DC bus to make its voltage fluctuate, and the control of the full-power fan (direct drive fan) is stable sex affects. [0004] In order to s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26H02J3/24H02J3/01H02J3/38H02J3/36H02J3/48
CPCH02J3/26H02J3/24H02J3/01H02J3/381H02J3/36H02J3/48H02J2300/28H02J2003/365Y02E40/40Y02E40/50Y02E60/60
Inventor 丁磊朱国防王志浩高雪松
Owner SHANDONG UNIV
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