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Wind farm single circuit outgoing line self-adaptive three-phase recloser and method thereof

A technology for sending out lines and wind farms, which is applied in the field of self-adaptive three-phase reclosing of single-loop sending out lines in wind farms, and can solve problems such as failure to maintain power supply reliability of wind farms and system secondary shocks

Inactive Publication Date: 2017-05-24
XINJIANG UNIVERSITY
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AI Technical Summary

Problems solved by technology

Although this method effectively reduces the time spent on reconnecting the wind farm to the grid, it still fails to achieve the purpose of maintaining the power supply reliability of the wind farm; Or transient faults that have not yet disappeared, will cause a secondary impact on the system

Method used

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  • Wind farm single circuit outgoing line self-adaptive three-phase recloser and method thereof
  • Wind farm single circuit outgoing line self-adaptive three-phase recloser and method thereof
  • Wind farm single circuit outgoing line self-adaptive three-phase recloser and method thereof

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Embodiment Construction

[0035] The present invention proposes an adaptive three-phase reclosing and method thereof for a single-loop outgoing line of a wind farm, the specific contents of which are as follows:

[0036] Install an appropriate amount of replacement load on the low-voltage side of the main transformer at the exit of the wind farm, and cut off some fans when necessary, thereby prolonging the time for the isolated grid containing the wind farm to maintain temporary stability, and gaining time for the synchronous coincidence of the side inspection of the wind farm; A charging capacitor is installed on the side of the wind farm, and the three phases of the sending line are tripped and put into operation after a fixed delay. By detecting the voltage change characteristics of the charging capacitor, it is cyclically determined whether the line fault disappears. Reconnection is allowed after the transient fault disappears. Before the fault disappears and permanently Non-coincidence due to perma...

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Abstract

The invention belongs to the wind power generation technology field, especially relates to a wind farm single circuit outgoing line self-adaptive three-phase reclosing strategy. According to the strategy, after the tripping of the three phases of the wind farm single circuit outgoing line, time of maintaining the transient stability of the wind farm is prolonged; and at the same time, the fault property of the outgoing line is determined: when the fault is transient, and disappears, a circuit is reclosed by a reclosing motion; when the fault is permanent, a recloser is locked, and the line is not superposed. Under a precondition of prolonging the transient stablility time of the wind farm, the rapid determining of the fault property of the outgoing line of the wind farm is realized, and superposition success rate after the tripping of the three phases of the wind farm outgoing line is effectively improved, and therefore second impact on a system caused by the superposition with the permanent fault and the existing transient fault is prevented.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to an self-adaptive three-phase reclosing switch for a single-loop outgoing line of a wind farm. Background technique [0002] my country's wind power resources are far away from the load center, and the power generated by the wind farm is collected to the wind farm output line (110kV ~ 330kV) through the collector line, and then sent to the power grid through a higher voltage level (750kV) transmission line to the load center. This energy transmission method makes: (1) the wind farm has no local load or only a small load; (2) the sending line of the wind farm is mostly single-circuit. [0003] Wind farms are designed according to the principle of maximum power tracking, and do not have the ability to quickly adjust frequency and voltage. Therefore, once the single-loop outgoing line of the wind farm is tripped by the three phases, the large active power s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/06H02H3/05H02H3/027H02J3/14
CPCH02H3/027H02H3/05H02H3/066H02J3/14Y02B70/3225Y04S20/222
Inventor 李凤婷解超路亮陶仁峰
Owner XINJIANG UNIVERSITY
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