A control method for the start-up process of a high-power doubly salient motor drive system

Abstract

The invention relates to the technical field of motor control, in particular to a control method of the starting process of a drive system of a high-power double-salient-pole motor. The motor side of the system does not obviously impact the high-power double-salient-pole motor, so that reliable starting and running of the high-power double-salient-pole motor are guaranteed; meanwhile, the power factor of the network side is guaranteed, and the reliability of the system is effectively improved. A soft start switch, an input filter and a network-side converter of the system are connected with a network-side controller to form a network-side control system. The double-salient-pole motor and a motor-side converter are connected with a motor-side driver to form a motor-side control system. One side of the network-side control system is connected with a power grid. The network-side converter and the motor-side converter are connected through a direct-current filtering capacitor in a decoupling mode. The network-side control system and the motor-side control system conduct signal interaction through control ports and coordinate with each other for control. When the direct current side output voltage is constant, the starting current of the double-salient-pole motor is set to be a rated value, the double-salient-pole motor operates in a maximum torque starting control mode, and starting control of the double-salient-pole motor is completed quickly.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for controlling the start-up process of a high-power doubly salient motor drive system. Background technique [0002] As the application fields of motor drive systems are becoming more and more widespread, in high-power drive occasions, such as central air-conditioning drive systems, large machine tool drive systems, etc., due to the very large capacity of the drive system, the AC-DC-AC conversion used in traditional motor drive inverters In the inverter system, the grid-side AC-to-DC converter adopts the diode rectification method. Due to the nonlinear characteristics of the diode, a large amount of high-order harmonic current will be generated in the grid, which will cause serious harmonic pollution and reactive power increase to the grid. , endangering the power quality of the power grid. In order to ensure the safe and economical operation of power grids and h...

AI Technical Summary

Problems solved by technology

In order to ensure the reliable voltage build-up of the PWM converter on the grid side, it is usually necessary to reduce the output voltage at the light load or no-load to establish the output voltage of the DC side. Serious overcurrent phenomenon occurs on the grid side during the voltage building process of the rectifier, and the current demand for its soft start switch is very large, resulting in overheating of the soft start, unable to operate normally, and affecting the normal voltage building of the grid side system

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