RS485 bus communication method based on Modbus protocol and power electronic system based on communication method

Abstract

The invention discloses an RS485 bus communication method based on a Modbus protocol and a power electronic system based on the communication method. A master controller and slave controllers of the power electronic system communicate through the RS485 bus communication method based on the Modbus protocol. According to the RS485 bus communication method, the structures of communication frames generated by the controllers are defined, and reasonable communication frames and processing logic are defined through structural design of a communication program, which improves the communication efficiency and the utilization rate of an RS485 bus communication system, accelerates the speed of data response, and greatly reduces the transmission delay. The adopted RS485 bus communication system is high in communication reliability, low in cost and easy to implement, and is suitable for application in large-scale power electronic systems.

Description

technical field [0001] The invention belongs to the technical field of power electronics application, and in particular relates to a Modbus protocol-based RS485 bus communication method and a power electronic system based on the communication method. Background technique [0002] The increasing maturity of power electronic technology and the wide application of power automation equipment have effectively promoted the development of industrial productivity and the improvement of the level of electrical automation. However, due to the capacity limitation of a single power electronic device, it is restricted in the field of high-power applications. [0003] Utilizing the existing mature technology of small-capacity power electronic devices, it has become a research hotspot to realize the application of large-capacity occasions through modular parallel combination. At the same time, in some cases, it is necessary to combine different types of power electronic devices (power elec...

AI Technical Summary

Problems solved by technology

However, since the application layer corresponding to the RS485 bus has no standard protocol, the construction of the communication protocol and the efficiency of logic processing will largely affect the utilization rate and transmission delay of the RS485 bus communication

However, a large-scale power electronic system with a large number of modules requires multi-computer communication, and has high requirements for real-time data transmission. Therefore, the application of RS485 bus communication in large-scale power electronic systems is also severely limited.

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