Intelligent unit matrix grid connecting technology of wind generating set and special equipment thereof

Abstract

The invention discloses an intelligent unit matrix grid connecting method of a wind generating set and special equipment thereof, belonging to the technical field of wind power grid connection. The intelligent unit matrix grid connecting method is characterized in that a wind generating unit is connected with a storage battery after being rectified by a three-phase bridge rectifier and connected with one group of parallel-connected automatic control power generating unit sets through a direct-current bus, each automatic control power generating unit set is formed by connecting a voltage relay, a direct-current motor, an alternating-current power generator, a compound non-contact switch and a current-limiting reactor; and the output end of the automatic power generating unit set is connected to a power grid, the storage battery supplies power to a UPS (Uninterruptible Power Supply), the UPS supplies power to a yaw system and the voltage relay of the wind generating set and is also connected with a central control board in a controlling manner, and an overloading current relay is connected to the direct-current bus serially. After the intelligent unit matrix grid connecting method is implemented, the wind generating set has a low voltage ride through function, and wind power utilization efficiency is increased; and the intelligent unit matrix grid connecting method has the advantages of low cost, good effect, durability and capability of passing the strict standard of related wind power generation in China.

Description

technical field [0001] The invention belongs to the technical field of large-scale wind power grid connection, in particular to the grid connection technology of intelligent unit matrix of wind power generating sets and its special equipment. Background technique [0002] In 2010, due to the unmatched construction period of wind farms and the instability of wind power, the country could not allow wind power to be connected to the grid, so the wind turbines could only be stopped to generate electricity, that is, "wind abandonment". The power generation of abandoned wind exceeded 6 billion kWh. On February 24, April 17, April 24, and April 25, 2011, large-scale off-grid accidents of wind turbines caused by electrical equipment failures occurred in Jiuquan, Gansu Province, and Zhangjiakou, Hebei Province, respectively. In the notification of the accident by the Electric Regulatory Commission, the lack of low-voltage ride-through capability of the units that have been put into o...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned problems existing in the prior art, the purpose of the present invention is to design and provide a technical scheme of a large-scale wind power generating set intelligent unit matrix grid-connected technology and its special equipment. Improve the efficiency of wind energy utilization, enable the wind turbine to run safely and stably, and input "standard sine wave" electric energy to the grid, solving the problem of harmonic pollution to the grid

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