Fault ride-through implementation method and system for direct-driven draught fan

Abstract

The embodiment of the invention discloses a fault ride-through implementation method and system for a direct-driven draught fan. The direct-driven draught fan is connected with the direct-current side of a grid connection converter, and the line side of the grid connection converter is connected with a grid system. The method comprises the steps that the grid connection point voltage of the line side of the grid connection converter is detected; whether the grid connection point voltage is in a preset grid voltage limit value interval or not is judged; if the grid connection point voltage is not in the preset grid voltage limit value interval, the direct-current bus voltage of the direct-current side of the grid connection converter is calculated; according to the relation between the direct-current bus voltage of the direct-current side of the grid connection converter and a preset direct-current bus voltage limit value, electric energy discharged by the direct-driven draught fan is absorbed from the direct-current bus through a flywheel energy storage converter connected to a direct-current bus in parallel or electric energy is discharged to the grid system connected to the line side of the grid connection converter through the direct-current bus. According to the fault ride-through implementation method and system for the direct-driven draught fan, the direct-current bus voltage can be balanced, the fault ride-through capacity of the direct-driven draught fan is improved, and the safety and stability of operation of the grid system are improved.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a method and system for realizing fault ride-through of a direct-drive fan. Background technique [0002] Compared with the growth rate of traditional fossil energy, the growth rate of new energy (such as wind energy, light energy and other renewable energy) has exceeded 30% in the past few years, and it is one of the fastest growing energy fields. Due to the growing demand for energy in emerging countries and the continuous attention to environmental issues in Europe and the United States, the importance of new energy in future energy issues is increasing. As renewable new energy, wind energy and solar energy are attracting increasing attention due to their advantages of wide sources, large reserves, and no pollution. [0003] In the related art, in the use of wind energy, the wind energy is generally collected through a direct-drive fan to obtain a larger c...

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Problems solved by technology

[0006] Embodiments of the present invention provide a method and system for implementing fault ride-through of direct-drive wind turbines to solve the problem of weak fault ride-through capability of direct-drive wind turbines and low power grid security in the prior art

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