High voltage ride-through method of doubly-fed wind turbine generator set

A wind turbine, high-voltage technology, applied in wind power generation, emergency protection circuit devices for limiting overcurrent/overvoltage, electrical components, etc., can solve problems such as complex high-voltage ride-through methods

Inactive Publication Date: 2015-11-04
STATE GRID CORP OF CHINA +4
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a doubly-fed wind turbine high-voltage ride-through method to solve the problem that the existing doubly-fed wind turbine high-voltage ride-through method is relatively complicated

Method used

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  • High voltage ride-through method of doubly-fed wind turbine generator set
  • High voltage ride-through method of doubly-fed wind turbine generator set
  • High voltage ride-through method of doubly-fed wind turbine generator set

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, the system includes a grid-side converter, a machine-side converter, and a DC bus voltage discharge circuit. The DC bus voltage discharge circuit includes an IGBT, a DC discharge resistor R, and a diode. The diode and the IGBT are connected in reverse parallel to the DC The discharge resistor R is connected in series.

[0021] The system also includes a controller, which controls the switching elements in the converter connected to the grid side. The controller collects the AC voltage on the grid side and the actual value of the DC bus voltage at this time in real time, and then according to the program set inside the controller To control the on-off of the switching elements in the grid-side converter to achieve the purpose of increasing the DC side bus voltage, and then improve the controllable range of the AC side voltage...

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Abstract

The invention relates to a high voltage ride-through method of a doubly-fed wind turbine generator set. The method comprises the steps of: a voltage u on a power gride side is detected in real time, and the value of f(u)=k*u+A; when f(u)<=udc0 is calculated, the given value of the voltage of a direct current side bus is controlled to be udc0; when udc0<f(u)<=udcmax, the given value of the voltage of the direct current side bus is the value of f(u); when f(u)>=udcmax, the given value of the voltage of the direct current side bus is udcmax; wherein udc0 is a minimum direct current bus voltage value needed by rated alternating current voltage output; udcmax is the maximum value, and k is larger than 1; and the trigger pulse of a switch element of a network side current transformer is correspondingly adjusted according to given value of the voltage the direct current side bus. According to the invention, the given value of the voltage the direct current side bus is correspondingly adjusted according to the real-time change and the change range of the voltage of the power grid, and then high voltage ride-through is finished, so that ride-through operation of the generator set under a high voltage state is realized.

Description

technical field [0001] The invention relates to a high-voltage ride-through method for a doubly-fed wind turbine, belonging to the technical field of wind power generation system control. Background technique [0002] With the rapid development of wind power generation, the installed capacity of wind turbines has increased year by year, making the scale of wind turbines connected to the grid larger and larger, and the impact of the fluctuation characteristics of wind power systems has become more and more obvious. Voltage fluctuations, power Phenomena such as imbalance and large harmonic content affect the stable operation of the power system. In China's national standards, the relevant standards for low-voltage ride-through (LVRT) are clearly stipulated, see "GBT_19963-2011 Technical Regulations for Connecting Wind Farms to Power Systems". At present, the relevant standards of high voltage ride through (HVRT) have not yet been officially issued, but the impact of high volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02H9/00
CPCY02E10/76
Inventor 郜亚秋刘刚孙健许恩泽陈宁姜达军钱敏慧罗芳
Owner STATE GRID CORP OF CHINA
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