Earthing short circuit protection method, motor controller and computer readable storage medium

Abstract

The invention provides an earthing short circuit short-circuit protection method, a motor controller and a computer-readable storage medium. The short-circuit protection method comprises the followingsteps: when the motor controller is powered on, the phase of each phase / line voltage inputted into a controllable rectifying module in the motor controller is obtained. According to the phase of eachphase / line voltage, each semiconductor switch tube in the controllable rectifier module is controlled to start conduction when its corresponding phase / line voltage crosses a zero point, and the conduction angle of the semiconductor switch tube is gradually increased until the bus voltage of the motor controller reaches a preset threshold value. As that semiconductor switch transistor is controlled to conduct at the zero-crossing point of the phase voltage, the conduction width of the semiconductor switch transistor is gradually increased, and the bus voltage is slowly increased, the current flowing through the invert module when the load is short to ground is reduced, and the risk of device damage is reduced.

Description

technical field [0001] The present invention relates to the field of power electronic equipment, and more specifically, relates to a ground short circuit protection method, a motor controller and a computer-readable storage medium. Background technique [0002] The motor controller controls the AC motor to run according to the set direction, speed, angle, response time, etc. by changing the frequency of the motor's working power supply. In the above-mentioned motor controller, it is necessary to rectify the current to obtain DC power, and then invert it into AC power of the required frequency to drive the motor and realize motor speed regulation. This control method is called AC-DC-AC, which is the current mainstream technology. [0003] Currently, in motor controllers using diode rectification or thyristor rectification topologies, load short-circuit judgment is usually only performed after the system is powered on, and the short-to-ground fault on the inverter output side...

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a short-to-ground protection method, a motor controller, and a computer-readable storage medium, aiming to solve the problem of possible damage during power-on caused by not considering the short-to-ground fault on the inverter output side in the above-mentioned rectification topology. system device problem

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