Direct current side integrated superconductive energy-storing current source type wind energy converter

Abstract

The invention discloses a direct current side integrated superconductive energy-storing current source type wind energy converter. A fan (1) in the device is connected with the main shaft of a generator (3) through a gear box (2), the output end of the generator (3) is connected with the input ends of a plurality of parallelly-connected fan side current source type converters (5), and the output ends of the fan side current source type converters are connected with a fan side direct current current-sharing inductor (6); the input end of a power grid side current source type converter (9) is connected with a power grid side direct current current-sharing inductor (8), a superconductive magnet is connected between the fan side direct current current-sharing inductor and the power grid side direct current current-sharing inductor, and the superconductive magnet exchange energy with a power grid (13) through the power grid side direct current current-sharing inductor; the output ends of the plurality of parallelly-connected fan side current source type converters, a grid access inductor (11), a grid access transformer (12) and a power grid (13) are connected in series in turn; and a power grid side filter capacitor (10) is connected with the output end of the power grid side current source type converter and a fan side filter capacitor (4) is connected with the input end of the fan side current source type converter.

Description

technical field [0001] The invention is a novel wind energy changing system that organically combines superconducting magnetic energy storage and wind power generation through a high-power medium-voltage current source frequency converter, and belongs to the technical fields of electric engineering, power electronics, and motor applications. Background technique [0002] In order to utilize wind energy more effectively and reduce the construction cost of the single-unit system of wind turbines, the global wind turbines are developing towards the trend of large-scale. With the gradual increase of wind turbine capacity, the problem of high-speed transmission components of the gearbox has become increasingly prominent, so direct-drive wind turbines are increasingly used in large-scale wind power generation systems. The full-power inverter commonly used in direct-drive fans can significantly improve the power quality of the system, reduce the impact of the system on the grid, an...

AI Technical Summary

Problems solved by technology

At the same time, from the functional point of view, it is necessary to solve the technical problems of the traditional independent wind energy conversion system, such as the difficulty of smoothing the active power, the difficulty of low-voltage ride-through, and the transient stability of the multi-wind farm electric network.

Structurally, it is required to overcome the chopper-based problem of superconducting magnetic energy storage and wind power integration based on voltage source frequency converter, so as to make the structure more compact and the control more direct

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