Master-slave control method for converter tilting frequency conversion system

Abstract

The invention discloses a master-slave control method for a converter tilting frequency conversion system, which is used for controlling a frequency conversion system of a motor in a converter tilting system. According to the method, four AC asynchronous motors in the converter tilting system are respectively connected with a first frequency converter, a second frequency converter, a third frequency converter and a fourth frequency converter; the four frequency converters are Siemens S120-series frequency converters; The four frequency converters perform isochronal synchronous communication through SINAMICS Link network; one of the four frequency converters is used for main control, and at least one of the other frequency converters is used for slave control. The invention adopts Siemens S120-series frequency converters, performs communication through the SINAMICS Link isochronal synchronous network, and limits the communication delay to be within 3 ms. In addition, with the logical operation function of the S120-series frequency converter itself, the data can be collected and processed directly and accurately, which greatly improves the control precision.

Description

technical field [0001] The invention relates to master-slave control of frequency converters, in particular to a master-slave control method for converter tilting frequency conversion systems. Background technique [0002] The converter tilting system is the most important link in converter steelmaking. In the process of oxygen top-bottom combined blowing converter steelmaking, the stable tilting and accurate positioning of the furnace body directly affect the conversion of molten iron, blowing, feeding, tapping, The quality of a series of technological processes such as slag dumping and furnace repair. The operation of the converter tilting system has the characteristics of low speed, heavy load, forward and reverse rotation, frequent starting and braking, strong impact, large dynamic load, and harsh working conditions. In addition, since the converter tilting mechanism adopts a fully suspended four-point meshing flexible transmission, and the four drive motors are rigidly...

AI Technical Summary

Problems solved by technology

[0003] The frequency converter used in the existing converter tilting system has only limited free function blocks, and it is difficult to meet the complex control logic needs. Therefore, in the converter tilting control, the logic control part is handed over to the PLC as much as possible.

For inverters, the logic control capability of PLC is weak and cannot meet the needs of complex communication and control

However, with the improvement of steelmaking process requirements, the converter tilting system needs higher response speed and control precision, while PLC communicates with the inverter through the DP bus, no matter in terms of data transmission delay or signal anti-interference ability, have become its flaws, and cannot effectively improve the overall performance of the tilting control system

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