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Method for detection and protection of island with anti-theft and anti-tripping function aiming at large-scale wind power

An island detection and large-scale technology, applied in wind power generation, electrical components, circuit devices, etc., can solve the problems of island system instability, surge voltage, and complex operation, and achieve the effect of fast anti-island protection action

Active Publication Date: 2016-09-28
STATE GRID GANSU ELECTRIC POWER CORP +4
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AI Technical Summary

Problems solved by technology

2) The unique fault characteristics of the wind turbine. The wind turbine converter generally performs current control. The wind turbine is boosted through a step-by-step transformer. The wind turbine also needs to send electric energy to the booster station through a long collector feeder. In this system There is a large reactance, the system impedance is large, and the electromagnetic environment is relatively complex. Under sudden power failure, a large transient overvoltage will be generated
3) The island system is an unstable system, and its damping is small, which will generate a large transient overvoltage
4) If the system is not powered off at the beginning of reclosing, there will be an impulse voltage, and the more serious situation is that non-synchronous reclosing occurs. At this time, a large transient overvoltage will appear
Disadvantages of this method: additional equipment is required, high implementation cost, complex operation, many certifications are required, and low economy
[0028] The paper "Distributed Power Generation Islanding Method Based on Improved Prim Algorithm" proposes a minimum spanning tree algorithm based on the Prim method for the islanding problem of the user-side low-voltage distribution network. This method does not involve the high-voltage main network on the power supply side. Anti-islanding detection, and because the line weight needs to be considered, the anti-islanding protection action delay is relatively large

Method used

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  • Method for detection and protection of island with anti-theft and anti-tripping function aiming at large-scale wind power
  • Method for detection and protection of island with anti-theft and anti-tripping function aiming at large-scale wind power
  • Method for detection and protection of island with anti-theft and anti-tripping function aiming at large-scale wind power

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Embodiment Construction

[0074] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0075] Such as figure 2 As shown, an island detection and protection method with anti-stealing function for large-scale wind power, including:

[0076] The steps of initializing the node type table and the node connection table;

[0077] The step of monitoring the circuit breaker trip signal in the power grid, updating the node connection table according to the monitored circuit breaker trip signal, and starting the anti-stealing trip module at the same time;

[0078] as well as

[0079] A step of judging whether an island is formed according to the updated node connection table.

[0080] Preferably, the steps of initializing the node type table and the node con...

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Abstract

The present invention discloses a method for detection and protection of an island with an anti-theft and anti-tripping function aiming at large-scale wind power. The method comprises: initializing a node type table and a node connection table; monitoring breaker tripping signals in a power grid, updating the node connection table according to the monitored breaker tripping signals, and starting a anti-theft and anti-tripping function module at the same time; and determining whether an island is formed or not according to the updated node connection table. Aiming at a large-scale wind power generation system, the island detection and the protection from an island are performed at the high-voltage main grid of the power supply, and therefore the method for detection and protection of island with an anti-theft and anti-tripping function aiming at large-scale wind power is rapid, accurate, efficient, safe and stable. According to the technical scheme, the method for detection and protection of island with an anti-theft and anti-tripping function aiming at large-scale wind power does not need to consider the line weight and can rapidly perform protection from an island.

Description

technical field [0001] The invention relates to the field of anti-islanding protection for large-scale wind power generation, in particular to an island detection and protection method with anti-stealing function for large-scale wind power generation. Background technique [0002] The island state of a large wind farm (base) refers to the operating state in which some wind turbines in a large wind farm (base) continue to supply power to the loads under them after they are disconnected from the main grid. In large-scale wind power generation systems, effective and timely detection of isolated islands is of great significance to wind turbines and local loads. The principles and situations caused by large-scale wind power access to isolated islands are different from those in the distribution network. Therefore, the harm of large-scale wind power access to isolated islands is also different from the harm of isolated islands in the distribution network. First of all, after the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386H02J3/388Y02E10/76
Inventor 路亮汪宁渤丁坤胡家兵李晓龙周识远黄璐涵李津陈家乐冉亮熊雪君孙辰军韩自奋罗真摆念宗王永
Owner STATE GRID GANSU ELECTRIC POWER CORP
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