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Additional control method and system for suppressing transient overvoltage of direct-drive fan

A technology of transient overvoltage and additional control, applied in wind turbine control, engine control, control algorithm type, etc., can solve the problem of not considering the transient overvoltage of the direct-drive fan, and cannot effectively suppress the transient overvoltage of the direct-drive fan And other issues

Active Publication Date: 2021-03-19
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned terminal voltage feed-forward control can protect the direct-drive fan from the impact of overcurrent, the conventional feed-forward control can only satisfy the output voltage of the equivalent voltage of the direct-drive fan to quickly track the change of the terminal voltage, and does not consider the direct drive fan. The transient overvoltage problem of the fan cannot effectively suppress the transient overvoltage in the direct drive fan

Method used

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  • Additional control method and system for suppressing transient overvoltage of direct-drive fan
  • Additional control method and system for suppressing transient overvoltage of direct-drive fan
  • Additional control method and system for suppressing transient overvoltage of direct-drive fan

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Effect test

Embodiment 1

[0057] An additional control method to suppress the transient overvoltage of the direct drive fan, such as figure 2 shown, including:

[0058] When the terminal voltage of the direct drive fan rises, a voltage correction signal is generated according to the change index of the terminal voltage, and the voltage correction signal is added to the output terminal of the PI controller in the current control link of the direct drive fan grid side converter to correct the output of the PI controller The d and q axis components of the equivalent internal potential of the direct drive fan are used to reduce the equivalent power output voltage of the direct drive fan, thereby suppressing the transient overvoltage of the direct drive fan;

[0059] It is easy to understand that, in order to reduce the equivalent power supply output voltage of the direct drive fan after adding the voltage correction signal, in the present invention, both the d-axis component and the q-axis component of th...

Embodiment 2

[0069] An additional control method for suppressing the transient overvoltage of a direct-drive fan, this embodiment is similar to the above-mentioned embodiment 1, the difference is that in this embodiment, the change index of the terminal voltage is the change rate of the terminal voltage, and the generated The specific way of voltage correction signal is:

[0070] according to respectively generate the d-axis component E of the voltage correction signal dctrl and the q-axis component E qctrl ;

[0071] in, and Respectively represent V d and V q rate of change; k 3 ~k 6 is the gain parameter, and s is the differential operator.

Embodiment 3

[0073] An additional control method for suppressing the transient overvoltage of a direct drive fan, this embodiment is similar to the above-mentioned embodiment 1, the difference is that in this embodiment, the change index of the terminal voltage is the change amount of the terminal voltage, and the generated The specific way of voltage correction signal is:

[0074] or, according to respectively generate the d-axis component E of the voltage correction signal dctrl and the q-axis component E qctrl ;

[0075] Among them, ΔV d and ΔV q Respectively represent V d and V q The amount of change; k 7 ~k 10 is the gain parameter, and s is the differential operator.

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Abstract

The invention discloses an additional control method and system for suppressing transient overvoltage of a direct-drive fan, and belongs to the field of voltage safety control of a power system. The additional control method comprises the following steps that a voltage correction signal is generated according to a change index of terminal voltage when the terminal voltage of the direct-drive fan rises; and a voltage correction signal is used as a feedforward control signal to be attached to the output end of a PI controller in a current control link of a grid-side converter of the direct-driven fan to correct d-axis and q-axis components of the direct-driven fan equivalent internal potential output by the PI controller so as to reduce the output voltage of an equivalent power supply, so that the transient overvoltage of the direct-driven fan is suppressed. According to the additional control method and system, the transient overvoltage of the direct-drive fan can be effectively suppressed, the safe operation of the power system is ensured, only the situation that the terminal voltage rises is responded, and action is avoided when the terminal voltage is not changed or falls, so that the normal control of the direct-drive fan is not influenced under the situation that the transient overvoltage is suppressed.

Description

technical field [0001] The invention belongs to the field of power system voltage safety control, and more specifically relates to an additional control method and system for suppressing transient overvoltage of a direct-drive fan. Background technique [0002] In recent years, with the increasing proportion of wind power generation in the power system, it has gradually become the core factor that determines the dynamic behavior of the system, and the controller is the core factor that determines the dynamic characteristics of the wind turbine. [0003] With the wide application of direct-drive fans in power systems, their transient overvoltage problems frequently appear, which endangers the safe operation of power systems. The emergence of the transient overvoltage problem of the direct drive fan seriously damages the quality of power supply and endangers the safety of power supply. At present, the terminal voltage feed-forward control commonly used in direct-drive wind tu...

Claims

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Application Information

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IPC IPC(8): F03D7/00
CPCF03D7/00F05B2270/337F05B2270/705Y02E10/72
Inventor 何维付天照张睿黄谨王衡
Owner HUAZHONG UNIV OF SCI & TECH
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