Layered and domain-based anti-islanding protection method for large-scale wind power generation

Abstract

The invention discloses a layered domain-partitioned anti-islanding protection method for large-scale wind power generation. The method includes the steps of: monitoring all breaker tripping signals in a wind power generation system; judging when cluster main station outgoing tie lines and a main transformer are all disconnected according to the breaker tripping signal of the cluster main station, and protecting an island formed due to disconnection of all the cluster main station outgoing tie lines and the main transformer; judging whether an island is formed due to a wind power plant collection bus fault according to the breaker tripping signal of the wind power plant collection bus, and protecting the island formed by the wind power plant collection bus fault; and judging whether an island is formed due to a wind power plant current collection feeder line fault according to the breaker tripping signal of a blower fan feeder line, and protecting the island formed by the wind power plant current collection feeder line fault. The layered domain-partitioned anti-islanding protection method for large-scale wind power generation realizes the advantages of being rapid, accurate, efficient, safe and stable.

Description

technical field [0001] The invention relates to the field of anti-islanding protection for large-scale wind power generation, in particular to a layered and domain-based anti-islanding protection method 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 islanding ...

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 by step-by-step transformers. 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

This method needs to consider the weight of the line, so there is a problem of large delay in the action of anti-islanding protection

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