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Fault protection device for flexible DC (Direct Current) transmission system of wind power plant

A technology of flexible DC and power transmission systems, which is applied in the field of fault protection devices for wind power generation systems and fault protection devices for flexible DC transmission systems in wind farms. , DC transmission line voltage fluctuations and other issues, to achieve the effect of small loss, high cost performance, and ensure reliable and safe operation

Inactive Publication Date: 2015-06-10
QUFU NORMAL UNIV +1
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  • Abstract
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Problems solved by technology

At the same time, it will suffer from the voltage fluctuation of the DC transmission line due to the influence of sudden wind speed and the overvoltage phenomenon caused by the disconnection of the transmission system, which will affect the transient stability and power supply quality of the wind farm.
The above problems seriously restrict the development of wind power based on flexible direct current transmission systems

Method used

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  • Fault protection device for flexible DC (Direct Current) transmission system of wind power plant
  • Fault protection device for flexible DC (Direct Current) transmission system of wind power plant

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0016] as attached figure 1 As shown, a fault protection device for a wind farm flexible direct current transmission system of the present invention includes a current limiting smoother 2, a buffer protector 3, a main circuit switch 4, an unloading circuit 5, an unloading switch 6 and a power diode 7. The two sides of the fault protection device are the DC output terminal 1 of the sending end station of the wind farm and the DC transmission line 8 respectively.

[0017] The current limiting smoother 2 consists of a large-capacity DC reactor L m and a diode in parallel with D m Composed to realize the current limiting and current smoothing functions of the direct current transmission line 8.

[0018] The buffer protector 3 consists of a small-capacity DC reactor L s and a diode in parallel with D s Composition, to limit the current of the direct curre...

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Abstract

The invention discloses a fault protection device for a flexible DC (Direct Current) transmission system of a wind power plant and belongs to the technical field of wind power generation. The device comprises a current limiting and smoothing device, a buffer protector, a main loop switch, an unloading loop, an unloading switch and a power diode. One end of the current limiting and smoothing device is connected with a DC output end of a sending end station and the other end is respectively connected with the buffer protector and the unloading loop; the other end of the buffer protector is connected with the main loop switch; the other end of the main loop switch is respectively connected with a DC transmission line and the diode; the other end of the unloading loop is respectively connected with the unloading switch and the power diode; and the other end of the unloading switch is earthed. The fault protection device is capable of protecting the wind power plant when over-current and over-voltage faults and voltage fluctuations occur in the DC transmission line at any wind velocities; the fault protection device has the advantages of being low in cost, less in loss, high in cost performance and the like; and the reliable and safe operation of the flexible DC transmission system of the wind power plant is ensured.

Description

technical field [0001] The invention relates to a fault protection device for a wind power generation system, in particular to a fault protection device for a flexible direct current transmission system of a wind farm, and belongs to the technical field of wind power generation. Background technique [0002] At present, wind farms based on flexible DC transmission will suffer from overcurrent faults caused by short circuits in the DC transmission system or instantaneous voltage drops in DC transmission lines, which will affect the transient stability of wind turbines and their converters in the wind farm. In severe cases, wind farms will be disconnected from the grid, causing large-scale power outages. According to the relevant national grid connection standards for wind farms, it is required that the wind farms can be connected to the grid when a certain voltage drops. At the same time, it will suffer from the voltage fluctuation of the DC transmission line due to the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H9/04
Inventor 闫绍敏
Owner QUFU NORMAL UNIV
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