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Control device for grid connection current

A control device and current technology, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve problems affecting the rapidity of current tracking and reduce the impact on the power grid , high grid-connected current, and the effect of reducing grid-connected current fluctuations

Active Publication Date: 2012-07-04
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

But this control method requires a lot of calculations, which affects the rapidity of current tracking

Method used

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  • Control device for grid connection current
  • Control device for grid connection current
  • Control device for grid connection current

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Embodiment Construction

[0046] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] see figure 1 , which is a structural diagram of an application embodiment of a grid-connected current control device provided by the present invention.

[0048] In order for those skilled in the art to better understand and implement the technical solutions provided by the present invention, the architecture of the wind power generation system is firstly introduced.

[0049] figure 1 The shown DC voltage Udc is obtained after the rectifier of the wind turbine converter rectifies the three-phase AC voltage output by the wind turbine. Because this part is not within the scope of protection of the present invention, so in figure 1 not marked in.

[0050] The DC voltage Udc is applied to both ends of the three bridge arms of the t...

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Abstract

The invention provides a control device for grid connection current. Current hysteresis control is combined with SVPWM (Space Vector Pulse Width Modulation) control, and two control methods of detecting grid connection current control and current hysteresis control are switched in real time. When the grid connection current is abnormal, the current hysteresis control is automatically switched, and a grid connection current error is limited in an allowed range. When the SVPWM controller detects that the deviation between the practical three-phase grid connection current and command current is within the allowed range, the SVPWM control mode under the normal situation is switched again. The SVPWM controller effectively reduces the grid connection current fluctuation caused at the moment when the two control methods are switched according to the fact that the detected three-phase current is still operated, and the duty ratio is still updated in real time, thereby obtaining high-quality grid connection current. The device can respond in real time when the grid connection current waveform is abnormal, the grid connection current is controlled to be within the allowed range, a fan system is protected, and the impact on the grid is reduced.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a control device for grid-connected current. Background technique [0002] With the development of wind power technology to the present stage, various technologies have been perfected to varying degrees and are becoming more and more mature. The wind power industry must realize industrial transformation. Industrial development must change from the pursuit of speed to the pursuit of quality, and from the pursuit of installed capacity to the pursuit of wind power generation. [0003] At present, with the problems exposed in my country's wind farms in the early stage and the country's increasing investment and attention to wind power, how to reliably connect wind power to the grid and provide high-quality power has become one of the main tasks of the wind power industry at this stage. As for the wind turbine converter, which is a key part between the wind turbine and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02H9/02
Inventor 曹仁贤余勇张显立吴玉杨周俭节
Owner SUNGROW POWER SUPPLY CO LTD
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