Low voltage traversing control method for wind power generation set grid-connection current transformer

Abstract

The invention provides a method for controlling low-voltage ride-through of the grid-connected converter of a wind-driven generating set. On the basis of back-to-back voltage or current-typed grid-connected converter, a motor-side converter detects the middle direct current voltage; a voltage adjuster controls the middle direct current voltage to follow with the middle direct current voltage instruction value; a torque adjuster controls the practical torque to follow with the torque instruction value; an active power adjuster controls the grid-side converter and leads the grid-connected active power to follow with the active power instruction value. The transfer of the dump energy is realized by the coordinated control of the motor-side converter and the grid-side converter, elements such as additional resistance and the like are not required so as to consume the rest energy, thus ensuring that the wind-driven generating set does not run without the grids during the falling period of the network voltage at the access point. The method improves the efficiency of the unit, reduces the energy loss, simplifies the structure of the system, reduces the volume of the device, reinforces the compactness of the structure and reduces the cost of the device.

Description

technical field [0001] The invention relates to a grid connection method of a wind power generating set, in particular to a low voltage ride through control method of a wind power generating set grid connection converter. Background technique [0002] With the continuous increase of the installed capacity of wind turbines, the position of wind power in the power system has changed. When the installed capacity of wind power is small, the impact of wind farm operation on system stability can be ignored; when the installed capacity of wind power becomes larger and the proportion of the system increases year by year, the impact of wind farm operation on system stability become inescapable. Power systems around the world have increasingly strict requirements for wind farms to be connected to the grid. Grid companies in various countries have successively put forward stricter technical requirements for the grid connection of wind farms / wind turbines, including low voltage ride-th...

AI Technical Summary

Problems solved by technology

Although this technology is simple and reliable, on the one hand, it reduces the system efficiency, and at the same time, it needs to increase the number of components, and the hardware cost and volume weight of the system increase accordingly.

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