Active intelligent lightning protection method and system for wind turbine generator system

Abstract

The invention discloses an active intelligent lightning protection method for a wind turbine generator system. The method comprises the following steps that S01, the surrounding environment characteristic of the wind turbine generator system is obtained, and an environment characteristic value is pre-processed; S02, the pre-processed environment characteristic value is analyzed and judged, and early warning judgment of different levels for the lightning stroke which may be generated is performed; and S03, according to early warning signals of different levels, wind turbines are controlled to operate in a multi-level speed-limiting and power-limiting mode, and when the early warning level reaches the highest level, blade returning and active shutdown are performed. The invention also correspondingly discloses a lightning protection system for executing the lightning protection method. The lightning protection method and system have the advantages of active intelligent lightning protection and the like.

Description

technical field [0001] The invention mainly relates to the technical field of wind power, in particular to an active intelligent lightning protection method and system for a wind power generating set. Background technique [0002] Lightning strikes have always been one of the most threatening and difficult problems in the field of wind power generation. In order to capture as much wind energy as possible for wind turbines, the nacelle and blades are located extremely high from the ground, and there are generally no shelters around the wind turbines. These characteristics make wind turbines naturally vulnerable to natural lightning strikes. With the development of the wind power industry, the development of wind resources in the southern mountainous areas, and the development of high-tower models have made the risk of lightning strikes faced by wind turbines more severe. [0003] At present, the lightning protection of wind turbines all adopts the passive lightning protectio...

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that the level of any lightning protection device, its anti-overvoltage, overcurrent and anti-electromagnetic induction capabilities are limited, and it cannot fully guarantee wind power under different types of lightning strikes (direct lightning, induction lightning) and lightning intensity. The safety of unit equipment operation

That is to say, the traditional passive lightning protection system used in the wind power field has no active predictive alarm and intervention function no matter how threatening lightning strikes are. Can achieve complete lightning protection under lightning conditions

This has a very dangerous possibility: Once the lightning protection system is defective or fails, the strong electromagnetic interference of lightning can easily interfere with and destroy the control system of the wind turbine, especially when the wind turbine is still generating power, it is very easy to cause the pitch system to fail, making The blades cannot return to the propellers smoothly, resulting in serious accidents such as wind turbine crashes

In addition, once the wind turbine lightning protection device is damaged, it will cause the wind turbine to shut down safely, and it is necessary to manually check and replace the damaged parts before the equipment can resume operation

For wind farms that often have lightning weather, it requires a huge cost of manual maintenance, troubleshooting costs, and also affects the availability of equipment

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