Research on Cascade PID Advanced Control of Natural Gas Recondenser Based on PLC

The automatic control of the recondenser is the focus of the production process and control strategy of the LNG terminal. This paper expounds its technological process, and combines the advanced algorithm to optimize the process control, and combines the traditional cascade PID control and fuzzy control to make it have the characteristics of fast response. By running the fuzzy control algorithm on Matlab software and carrying out OPC communication with Siemens S7-1200 PLC, the advanced control algorithm is combined with the PLC control system. Compared with the cascade PID control, it has the characteristics of better dynamics and smaller overshoot.