Li-ion battery energy storage controller of wind generating set

Abstract

A Li-ion battery energy storage controller of a wind generating set comprises a rectifying circuit and a buck chopper circuit connected with the rectifying circuit. The buck chopper circuit is connected to a Li-ion battery through a current converting switch tube. The Li-ion battery energy storage controller of the wind generating set further comprises a capacitive snubber circuit and a corresponding control circuit, and the capacitive snubber circuit is connected to the output end of the buck chopper circuit. The corresponding control circuit comprises a PLC control unit which comprises a segmentation charging control circuit, and the segmentation charging control circuit is used for controlling the charging process of the Li-ion battery, namely, the charging process is of carrying out constant current charging first and constant voltage charging second. A dynamic compensation cache control circuit is used for controlling the energy storing and compensating working process of the snubber circuit. The Li-ion battery energy storage controller of the wind generating set further comprises a logical judgment unit for controlling the on-off of the current converting switches of a whole main circuit. According to the Li-ion battery energy storage controller of the wind generating set, the charging of the Li-ion battery can be guaranteed to be carried out safely and effectively, buffer storage can be carried out on energy when output power of the wind generating set is too small in a low wind speed, and energy conversion efficiency of the wind generating set is greatly improved.

Description

technical field [0001] The invention relates to a controller for wind power generation energy storage equipment, in particular to a lithium battery energy storage controller for an off-grid direct drive wind power generator. Background technique [0002] The energy crisis in the world is getting worse day by day. With the excessive use of fossil energy, environmental problems are becoming more and more prominent. Therefore, the governments of various countries have also begun to seek the development of various clean energy sources, among which new forms of clean energy such as wind energy, solar energy, and nuclear energy have become the focus of people's attention and development. Compared with the characteristics of different forms of new energy, wind energy development has become the power generation method with the most large-scale development conditions and commercial development prospects due to its advantages of low cost, high safety, and large-scale development. [...

AI Technical Summary

Problems solved by technology

[0005] In CN 101447760 B announced on October 3, 2012, a voltage control circuit that can automatically adjust the off-grid vertical axis wind turbine is disclosed. Control the chopper circuit to stabilize the fluctuating voltage output by the wind turbine, and realize the constant current charging function by adjusting the duty cycle of the buck-boost chopper circuit, but it cannot solve the problem of charging energy storage under low wind speed working conditions

However, if the voltage is used as the control parameter alone, even if the voltage meets the charging requirements of the battery, when the charging current is too small, the charging times can only be increased but the battery cannot be fully charged. service life

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