Multiple-converter master-slave control system

Abstract

An embodiment of the invention discloses a multiple-converter master-slave control system. The multiple-converter master-slave control system comprises a main frequency converter, a first slave frequency converter, a second slave frequency converter and N third slave frequency converters. A fourth sending port of the main frequency converter is in communication connection with a first receiving port of the first slave frequency converter; a fourth receiving port of the main frequency converter is in communication connection with a second receiving port of the second slave frequency converter; a first sending port of the first slave frequency converter is in communication connection with a second receiving port of the second slave frequency converter through the N third slave frequency converters which are connected in series, wherein N is an integer which is greater than or equal to zero. The multiple-converter master-slave control system facilitates simplifying wiring structure complexity of a converter system and improving stability and reliability of the converter system.

Description

Technical field [0001] The present invention mainly relates to the technical field of power electronics, in particular to a multi-machine master-slave control system of a frequency converter. Background technique [0002] In the inverter master-slave control system, the products on the market at this stage are mainly based on the RS485 bus communication method for the design of the communication between the master and the slave. The structure of 485 bus communication mode is as figure 1 As shown, the console transmits the system operating frequency to each inverter through the 485 bus, and each inverter transmits status feedback information to the console through the bus. In addition, the system start and stop signals given by the console and the torque signals sent by the master inverter to the slave inverters are all realized through separate hard-wire connections. The problem with this method in field applications is that the wiring of various control lines is complicated and...

AI Technical Summary

Problems solved by technology

The problem of this method in field application is that the wiring of various control lines is complicated, and the wiring of the serial bus is too long

[0003] In the process of research and practice, the inventor found that the existing inverter system has some defects in the application of dual-machine and multi-machine master-slave control: the communication mode of 485 bus has weak anti-interference in the communication mode between master and slave machines , the disadvantage of poor signal transmission stability

Due to the limitations of communication methods, it is difficult to carry out ultra-long-distance signal transmission

Moreover, the control structure of the master-slave system is complex, multiple signal lines work at the same time, and the installation and operation are cumbersome

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