A wind turbine low voltage ride through and active filter compensation device and switching method

A low-voltage ride-through, wind turbine technology, applied in harmonic reduction devices, wind power generation, reactive power compensation, etc., can solve problems such as low-voltage ride-through that cannot be solved, and achieve the effect of convenient and flexible switching and improved utilization.

Active Publication Date: 2016-08-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution can only control the harmonic pollution of the power grid, and cannot solve the problem of low voltage ride through

Method used

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  • A wind turbine low voltage ride through and active filter compensation device and switching method
  • A wind turbine low voltage ride through and active filter compensation device and switching method
  • A wind turbine low voltage ride through and active filter compensation device and switching method

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Embodiment Construction

[0029] Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.

[0030] Such as figure 1 As shown, the automatically switchable wind turbine low-voltage ride-through and active filter compensation device is installed on the three-phase circuit between the wind turbine and the PCC point of the common connection of the power grid. The device includes a PWM converter 1, an LC filter 2, a switching device 3, a series coupling transformer 4, a bypass switch 5, a pulse control unit 6, a wind generator 7 and a common connection point 8 of the power grid; wherein, the PWM converter 1 The three-phase output is connected to one end of the LC filter 2, the other end of the LC filter 2 is connected to the input of the switching device 3, the output of the switching device 3 is divided into three phases and each phase has two output terminals, and one output terminal of each phase A 3 , B 3 、C 3 The port is connected to the publi...

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PUM

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Abstract

The invention discloses a low-voltage ride-through and active filter compensation device and switching method for wind turbines. These include PWM converters, LC filters, switching devices, series coupling transformers, bypass switches, pulse control units, wind turbines and grid common connection points. The compensation system realizes harmonic and reactive current compensation in the three-phase line when the converter of the wind turbine produces a relatively large degree of low-order harmonic current, or the power grid requires the wind turbine to have a certain reactive power adjustment capability. The compensation system realizes the low-voltage fault ride-through operation of the wind turbine in the case of a voltage drop caused by a grid fault. The compensation system can realize switching between the active filter circuit and the low voltage ride-through circuit. The two circuits share the main circuit module of the PWM converter, which reduces the volume of the device, saves the cost of the device, and improves the utilization rate of the device.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and relates to a series-type low-voltage ride-through control, a parallel-type active filter and an automatic switching method for two working modes of a wind power unit. Background technique [0002] As wind energy is a clean and non-polluting new energy, vigorously developing the wind power industry is of great significance for energy conservation, emission reduction and low-carbon economy. In today's world, while the installed capacity of wind power is growing rapidly, wind power technology has also made great progress, especially the wind turbine itself, which has developed from the fixed pitch and constant speed technology in the 1990s to the widely used variable pitch technology today. , variable speed technology, and the stand-alone capacity keeps setting new records. In the past, in order to protect wind turbines, wind farms generally avoid the impact of grid failures on wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/01H02J3/18
CPCY02E10/76Y02E40/30Y02E40/40
Inventor 张建忠张欣熊良根
Owner SOUTHEAST UNIV
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