Wind driven generator braking circuit and method adopting latching relays

Abstract

The invention provides a wind driven generator braking circuit and method adopting latching relays. The circuit comprises a three-phase rectification module, driving power supplies and the latching relays, wherein the three-phase rectification module is used for converting three-phase AC voltage output by a wind driven generator into DC voltage, positive and negative poles of the DC voltage are connected with positive and negative inputs of the driving power supplies respectively, outputs of the driving power supplies are connected with coils of the latching relays, and the latching relays are used for accessing the three-phase AC voltage output by the wind driven generator or the DC voltage output by the three-phase rectification module. Three-phase AC electric energy output by the wind driven generator or DC electric energy output by the three-phase rectification module is short-circuited through closing of contacts of the latching relays, so that the energy output by the wind driven generator is converted into heat energy, and the wind driven generator braking effect is realized; when the wind driven generator is braked, the output voltage of the wind driven generator is substantially reduced, the driving power supplies stop working, and the latching relays perform wind driven generator braking protection continuously under the condition that the coils are powered off.

Description

technical field [0001] The invention relates to the technical field of small wind turbine controllers, in particular to a wind power generator braking circuit and method using a self-holding relay. Background technique [0002] Wind turbine braking refers to dragging the mechanical structure of the wind turbine to a state of stopping by imposing a large energy consumption. In layman's terms, it is to prevent the wind turbine from turning. [0003] Fan braking generally occurs when the wind speed exceeds the set protection value of the fan brake or the electric energy generated by the fan is much greater than the energy demanded by the back-end load. If there is no braking at this time, the fan blades will turn faster and faster until the mechanical structural stress is exceeded and the rear end load is damaged. [0004] The traditional fan braking method is mainly to rectify the three-phase AC power UVW emitted by the fan into DC power, and to short-circuit the AC power UVW...

AI Technical Summary

Problems solved by technology

[0005] The traditional fan braking method cannot automatically maintain the fan braking state for a long time when the drive power is cut off, and consumes more power

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