Supercapacitor discharging device and method

Abstract

The invention discloses a supercapacitor discharging device and method. The device comprises a main control unit used for controlling the discharging of a supercapacitor, a voltage detection unit used for detecting the voltage of the supercapacitor, a current detection unit used for detecting the discharge current of the supercapacitor, an inversion unit used for controlling the on-off state of a discharge loop of the supercapacitor and the selection of the discharge loop, and a motor unit used for discharging energy of the supercapacitor. The input of the inversion unit is connected with the supercapacitor, and three output terminals U, V and W of the inversion unit are respectively connected to three input ends of a three-phase stator winding of the motor unit. The energy of the supercapacitor is discharged through the inversion unit and the motor unit. According to the invention, constant-power discharge in the full discharging process of the supercapacitor can be realized, and the actual capacity of the supercapacitor can be calculated in the discharging process to serve as a basis for evaluating the health state of the supercapacitor.

Description

technical field [0001] The present application generally relates to the technical field of wind power generation, in particular to a discharge device and method in wind power pitch control, and in particular to a supercapacitor discharge device and method. Background technique [0002] In recent years, in the pitch system, due to the advantages of fast charging and discharging speed, wide temperature range, and long cycle life, supercapacitors have been widely used as backup power sources, and they have the potential to replace batteries. During the daily operation of the wind turbine, sometimes it is necessary to remotely control the discharge of the super capacitor module in the pitch system through SCADA (Data Acquisition and Supervisory Control System) to check the working status of the super capacitor module and ensure the safe operation of the wind turbine. On the other hand, during the daily operation and maintenance of the pitch control system, it is sometimes necess...

AI Technical Summary

Problems solved by technology

However, the discharge power of the scheme of setting the discharge resistor inside the pitch control system is small, and the constant power discharge cannot be achieved because the discharge current is not detected, and there is no supercapacitor capacity estimation function; the scheme of setting the discharge resistor outside the pitch system can only be operated locally , remote discharge cannot be performed, and an external discharge device needs to be carried, which greatly increases the workload of operation and maintenance

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