Wind-power-contained isolated grid running outgoing line reclosing method adapting to formation of three-phase tripping operation

A technology of sending out lines and isolated grids, which is applied in the reclosing field including the isolated grid operation of wind power grids, which can solve the problems of small systems unable to meet the requirements of inspection synchronization, failure of reclosing, frequency and voltage of isolated grids exceeding limits, etc. Allowable closing time and frequency, improve the success rate, and ensure the effect of stable operation

Active Publication Date: 2015-04-22
STATE GRID CORP OF CHINA +3
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to address the above problems, to propose a method for reclosing the outgoing line with wind power isolated grid operation that is suitable for the formation of three-phase tripping, so as to solve the problem of short-circuit faults in the outgoing line due to the existence of surplus power. The frequency and voltage of the isolated grid with load including the wind farm quickly exceeded the limit, and the small system side could not meet the synchronization inspection requirements, resulting in the failure of reclosing

Method used

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  • Wind-power-contained isolated grid running outgoing line reclosing method adapting to formation of three-phase tripping operation
  • Wind-power-contained isolated grid running outgoing line reclosing method adapting to formation of three-phase tripping operation
  • Wind-power-contained isolated grid running outgoing line reclosing method adapting to formation of three-phase tripping operation

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Embodiment 1

[0039] Such as image 3 As shown in Fig. 1, a method for reclosing the sending line of the wind power isolated grid that is suitable for the formation of three-phase tripping includes the following steps:

[0040] Step 1. When the transmission line of the load-bearing isolated grid including wind power fails, the three-phase trip of the protective quick-break action will temporarily change the output of various generators in the isolated grid and the load will remain unchanged; that is, the injected power of the conventional power supply in the isolated grid P 0 , Injected power P of the wind farm f and load P load unchanged; the transmission power sent out before the detection of a fault is the surplus power △P 1 , where ΔP 1 =P f +P 0 -P load ;

[0041] Step 2. Judging the above surplus power △P 1 and wind farm injected power P f The size of : If the wind farm injects power P f Greater than surplus power △P 1 , the wind farm adopts the method of high-cycle cut-of...

Embodiment 2

[0058] Such as figure 1 , figure 2 As shown, the installed capacity of the wind farm on the isolated grid side is 30MW, and the output of each wind turbine is 1.5MW. The generators G1, G2 and G3 are all conventional energy sources, and the installed capacity is 50MW. The initial power angle of the generators is 25°. Machine rotor time constant T j = 6s. After a three-phase fault occurs at point f, the protection action trips, and detects the surplus power △P of the outgoing line including the isolated grid of the wind farm at this time 1 ; compare △P 1 and wind farm injected power P f the size of.

[0059] Surplus power △P 1 Greater than the injected power P of the wind farm f ; Since the initial power is greater than the injected power of the wind farm, it is considered to cut off all the wind power at this time, and the injected power of the wind farm is reduced to 0, and the surplus power at this time ΔP is determined 2 ; Based on the equal-area rule using the (a...

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Abstract

The invention discloses a wind-power-contained isolated grid running outgoing line reclosing method adapting to formation of three-phase tripping operation. When a wind-power-contained isolated grid running outgoing line with loads breaks down, protection quick-breaking action three-phase tripping is achieved; the transmission power, namely the surplus power delta P1 of the outgoing line before the line breaks down is detected; the values of the surplus power delta P1 and the wind power field injection power Pf are judged; the final surplus power delta P2 of the outgoing line is determined, the delta Pmax is calculated through an equal area method, the delta P2 and the delta Pmax are compared, the maximum tripping frequency and the maximum tripping time are calculated, the allowed tripping time and frequency of the isolated grid outgoing line are enlarged, the time of normal running state recovering of the wind-power-contained isolated grid with the loads is shortened, and the problems that due to existence of the surplus power, the frequency and voltage of the wind-power-contained isolated grid with the loads formed after the outgoing line has a short-circuit fault and three-phase tripping of a breaker happens are out of limit rapidly, the small system side can not meet the synchronism check requirement, and reclosing fails are solved.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method for superimposing transmission lines of isolated wind power grids that are adapted to three-phase tripping. Background technique [0002] At present, my country's wind resources are abundant and wind farms and wind areas are concentrated. Wind power is connected to the distribution network in a decentralized manner, and part of the electric energy is consumed locally, which reduces the pressure of long-distance high-voltage power transmission to a certain extent. The access of wind power has brought many new problems to the grid. For an isolated grid with loads of wind power, it is equivalent to injecting an unstable power into the grid that can maintain its own stability. Due to the injection of unstable factors, it is bound to affect the original grid. The power balance is affected, which puts forward new requirements for both protection and reclosing. Due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02J3/38
CPCY02E10/76
Inventor 路亮何世恩辛超山周强李凤婷张金平王婷王月林柴海涛
Owner STATE GRID CORP OF CHINA
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