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

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 ...

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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

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