A Master-Slave Control Method for High Voltage Frequency Converter

Abstract

The invention discloses a master-slave control method of a high-voltage frequency converter, which is suitable for a control system of a high-voltage frequency converter, comprising: step S1, providing a host frequency converter and a slave frequency converter; speed command and perform preliminary processing; at the same time, synchronously send the speed command after preliminary processing to the slave inverter to control the speed of the slave inverter synchronously; step S3, the slave inverter obtains the speed detection of the slave through the slave speed regulator and feedback the detected value of the slave speed to the host inverter; step S4, the host inverter receives the detected value of the speed of the slave, and performs the detected value of the speed of the slave according to the detected value of the speed of the host and the torque compensation command. Calculate to output the compensation result; in step S5, the host inverter sends the calculation result to the slave inverter to compensate the torque command of the slave inverter. Beneficial effects: High-precision synchronous control is realized through the speed sensorless vector control.

Description

technical field [0001] The invention relates to the technical field of high-voltage frequency converters, in particular to a master-slave control method for high-voltage frequency converters. Background technique [0002] The high-voltage inverter is a power control device that converts the industrial frequency power supply to another frequency by effectively controlling the on-off of the power semiconductor device. Because the rotation frequency of the driven motor is adjustable, the load can effectively save electricity and achieve the highest work efficiency. [0003] At present, there are many control methods such as constant V / f control, vector control, direct torque control, and speed sensorless vector control of high-voltage inverters. When facing constant torque loads such as belt conveyors and tube belt conveyors, multiple motors are required To jointly drive the same load often requires the master-slave control of multiple frequency converters, so as to realize th...

AI Technical Summary

Problems solved by technology

Due to the lag of the torque response, the speed synchronization accuracy is not high. When starting with heavy load and heavy load, it is easy to cause the belt to stretch or accumulate, and in severe cases, the belt will break, so it cannot meet the requirements of some high-precision synchronous control occasions.

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