Master and slave control method based on high-voltage big-power transducer

Abstract

The invention discloses a master and slave control method based on a high-voltage big-power transducer, which is characterized by mainly comprising the following steps: N cascading high-voltage big-power transducers are connected to an optical fiber adapter plate connected with a master control system, and one high-voltage big-power transducer is appointed as master control driving, the rest is slave control driving, and N is greater than or equal to 2; the master control system is electrified, and the master control driving operates according to the given frequency f0; the master control system calculates the master voltage modulation wave form of the master control driving, and the master voltage modulation wave form is sent to the optical fiber adapter plate; the optical fiber adapter plate divides obtained master voltage modulation wave form into N-1 paths of completely same secondary voltage modulation wave forms and inputs the N-1 paths into the corresponding slave control driving. The invention fully utilizes the basic principle that a motor can be provided with completely same input voltage if two transducers input completely same PWM wave, thus effectively avoiding the requirement of high-speed precise transmission when a velocity sensor, a speed signal and a torque signal are used.

Description

technical field [0001] The invention relates to a control method of a frequency converter, in particular to a master-slave control method based on a high-voltage and high-power frequency converter. Background technique [0002] In the application of frequency converter, master-slave control is required in many occasions, especially when a transmission device is driven by two or more motors, it is necessary to distribute the load among the motors through master-slave control Make it evenly balanced to meet the control accuracy of the transmission point. The so-called master-slave control is to use one drive device as the master, and other drive devices as slaves, and automatically control the master drive device, while the master drive device controls the slave drive device. [0003] Most of the current high-voltage and high-power inverters use cascading methods, and their output voltage is formed by superimposing the output voltages of multiple units. The control method ado...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the main motor and the slave motor are driven unevenly due to the different control instructions obtained by the master motor and the slave motor when these high-power frequency converters adopt the master-slave control method at present, and provide an effective A master-slave control method based on high-voltage and high-power inverters to ensure uniform driving of the master motor and the slave motor

Images