Design on Gas Frequency Conversion Control System Based on Fuzzy Control
Gas ventilation is an important part of ensuring safety during underground coal mine mining.When a large amount of gas gushes out,the existing adjustment method has a certain lag and cannot dilute the gas in the working face quickly and effectively.This research designed a gas intelligent control system based on Siemens PLC,frequency converter,and industrial touch screen.It can monitor the gas characteristics of the working surface in real time and adjust the fan air volume.It can realize manual automatic switching of the frequency converter,main and backup machine switching and other functions through the touch screen.At the same time,by analyzing the ventilation char-acteristics of the local ventilator,a two-dimensional fuzzy controller was designed using the gas concentration deviation and deviation change rate as input variables.A brief mathematical model of the frequency converter-asynchronous motor was analyzed and established,and SIMULINK was used to carry out the fuzzy controller simulation tests were conducted and compared with traditional PID control.The test results show that the control effect of the fuzzy con-troller is improved compared with the dynamic performance of the traditional PID controller.
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