Method, system, computer equipment and storage medium for controlling DC bus discharge

Abstract

The invention relates to a method for controlling the discharge of a DC bus, comprising: receiving an active discharge command; obtaining a motor current signal according to the active discharge command; converting the motor current signal into a current signal in a stator coordinate system; based on the The current signal in the stator coordinate system and the random current reference command of the preset stator coordinate system output the voltage control signal in the stator coordinate system; the voltage control signal in the stator coordinate system is converted into a three-phase voltage control signal, and according to the The above-mentioned three-phase voltage control signal controls the working state of the switching device. Through the current signal in the stator coordinate system and the random current reference command of the preset stator coordinate system, the voltage control signal in the stator coordinate system is output to control the working state of the switching device, so that the motor controller is discharged, and it solves the problem that when the rotor position sensor fails, It will be impossible to prevent the stator current from generating mechanical torque, resulting in the problem that the residual electric energy on the high-voltage DC bus cannot be discharged quickly.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method, system, computer equipment and storage medium for controlling the discharge of a DC bus. Background technique [0002] The high-voltage system of electric products using permanent magnet synchronous motors as drive motors is composed of power battery packs (high-voltage battery packs), drive motor inverters (motor controllers), permanent magnet synchronous motors and other high-voltage electrical appliances. There is generally an energy storage capacitor on the high-voltage DC input side of each electrical appliance. In the case of a serious fault, the internal relay of the power battery pack is disconnected and the power supply to the high-voltage circuit is stopped, but the capacitor on the high-voltage DC bus will have high voltage due to residual electric energy, and these high voltages may cause electric shock to contacts. Therefore, the safety regulations w...

Images