Capacitor discharging method, device and system and storage medium

Abstract

The invention discloses a capacitor discharging method, device and system and a storage medium, and the method comprises the steps: obtaining a rotor position angle of a permanent magnet motor and anoutput current of the permanent magnet motor if a discharging instruction is received; determining a calibration voltage amplitude of a vector voltage in vector control of the permanent magnet motor according to the output current of the permanent magnet motor and the given discharge current amplitude; adjusting the output voltage corresponding to the output current by calibrating the voltage amplitude and the rotor position angle to obtain a target voltage; and generating a vector voltage based on the target voltage, so that the permanent magnet motor discharges the capacitor under the control of the vector voltage. By the adoption of the technical scheme, it can be guaranteed that quadrature-axis current is 0 and direct-axis current is not 0 under the condition that zero drift is too large or feedback is inaccurate in current sampling, the robustness of maintaining the static state of the permanent magnet motor is improved, and then the discharging reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of capacitor discharge, and in particular relates to a capacitor discharge method, device, system and storage medium. Background technique [0002] In a power supply system with high-power power electronic equipment, such as an electric traction system, in order to stabilize the fluctuation of the intermediate voltage and achieve a certain buffer function for energy, a passive component, that is, an intermediate capacitor, is often added to the power supply system. . This intermediate capacitor can not only realize voltage filtering, but also play the role of power storage. However, after the system is powered off, the intermediate capacitor will discharge naturally to consume the electric energy stored in the intermediate capacitor. However, during the process of discharging and consuming electric energy in the intermediate capacitor, the system is still charged, which affects the normal use of the system....

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a capacitor discharge method, device, system and storage medium to solve the problem of the low robustness of the permanent magnet motor in maintaining a static state when the capacitor is discharged in the prior art, resulting in discharge reliability poor problem

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