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Wind power plant collection system relay protection method based on substation area protection principle

A technology of station domain protection and relay protection, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as different fault characteristics and complex control strategies, and achieve the effect of good selectivity and quickness

Active Publication Date: 2017-05-31
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the installation of power electronic devices and the use of complex control strategies in wind turbines, their fault characteristics are significantly different from those of traditional synchronous generators. At the same time, the special topology of wind farms also brings challenges to the correct operation of relay protection.

Method used

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  • Wind power plant collection system relay protection method based on substation area protection principle
  • Wind power plant collection system relay protection method based on substation area protection principle
  • Wind power plant collection system relay protection method based on substation area protection principle

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056] Example 1: A phase-to-earth fault occurs on the collective busbar

[0057] Depend on Figure 5 It can be seen that the zero-sequence currents of the low-voltage side of the main transformer and all the collection feeders are almost equal ( Figure 5 The middle curve basically coincides), all satisfying That is, it is judged that a single-phase fault occurs on the bus. Then you can delay or immediately remove the fault according to the actual situation.

example 2

[0058] Example 2: An A-phase ground fault occurs at the end of the first collection feeder line #, and a phase-A ground fault occurs at the end of the collection line 1#.

[0059] Figure 6 In a, the two basically overlapping curves are the A-phase current curves of the second collection feeder and the third collection feeder, and the curve with large fluctuations is the A-phase current curve of the first collection feeder; Figure 6 In b, the two basically overlapping curves are the B-phase current curves of the second collection feeder and the third collection feeder, and the curve with larger fluctuations is the B-phase current curve of the first collection feeder.

[0060] Depend on Figure 6 It can be seen that the A-phase and B-phase short-circuit currents of the first collective feeder are both greater than the set value, that is, if a two-phase or two-phase ground fault occurs on the first collective feeder, the corresponding circuit breaker will be tripped immediatel...

example 3

[0061] Example 3: A phase-to-earth fault occurs at the end of the first collective feeder #

[0062] Figure 7 , the two basically overlapping curves are the A-phase current curves of the second collection feeder and the third collection feeder, and the dotted curve at the bottom is the A-phase current curve of the first collection feeder.

[0063] Depend on Figure 7 It can be seen that only the zero-sequence current of the first collector feeder does not satisfy It can be concluded that a single-phase fault occurs on the first collective feeder, and the corresponding circuit breaker is immediately tripped.

[0064] In the above solution of the embodiment of the present invention, the electrical quantity information of the collection system is collected through the electronic transformer of the bay layer, and uploaded to the decision center of the station control layer through the merging unit, and the fault location is performed according to the new station domain protect...

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Abstract

The invention discloses a wind power plant collection system relay protection method based on a substation area protection principle. The wind power plant collection system relay protection method comprises the following steps: installing same relay protection devices at the position of each collecting feeder outlet, on a grounding transformer and on a main transformer low-voltage side, carrying out communication on each relay protection device by following an IEC61850 rule, and sending electric quantity information measured by the corresponding electronic type mutual inductor inside each relay protection device into a station level decision center; and determining fault types according to the relation of magnitudes of the electric quantity information by the station level decision center, and then starting corresponding station protection mechanisms according to the fault types. According to the method, the complicated fault characteristics of a fan and the special topological structure of a wind power plant are taken into full account, fault distinguishing is carried out by using multi-port information amount collected by the electronic type mutual inductors, the constructed station area protection new principle has relatively high selectivity and power swing property, and the method is applicable for various types of wind power generation plants with different capacities.

Description

technical field [0001] The present invention relates to the technical field of relay protection, in particular to a relay protection method for a collection system of a wind farm based on the principle of station domain protection. Background technique [0002] In the context of the large-scale development of wind power, as the scale of wind power connected to the grid continues to expand, the fault characteristics of wind farms have brought a series of new challenges to the safe and stable operation of the power system. Especially in terms of protection and control measures to ensure the safe operation of power grids and wind farms, the impact of wind farms on the power system is increasing, and the traditional treatment of wind farms as equivalent loads is no longer applicable. Because the short-circuit characteristics of wind turbines are different from those of conventional power sources, it is of great significance to study wind farm protection that satisfies selectivit...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/263
Inventor 闫人滏贾科毕天姝李彦宾汪执雅
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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