Process controller design with process approximation and lambda tuning

Abstract

A method for designing and tuning a PID process controller includes approximating a process as a second order process but in a manner that includes the effects or characteristics introduced by variousdifferent devices in the I/O network, and using a lambda tuning method to determine tuning parameters or coefficients for the PID controller. The enhanced controller design and tuning method providesa systematic manner of achieving performance improvement of PID controllers within a process control system and is effective at overcoming challenges arising from signal aliasing, the use of anti-aliasing filtering and the effects of different I/O settings of both traditional and advanced I/O marshalling architectures.

Description

technical field [0001] The present invention relates generally to process control systems and, more particularly, to enhanced proportional-integral-derivative (PID) controller design using advanced process approximation methods and lambda (λ) tuning. Background technique [0002] Process control systems, such as those used in chemical, petroleum, or other processes, typically include distributed or scalable process control systems that are communicatively coupled to each other, to at least one host computer, or via an analog, digital, or combined analog / digital bus. operator workstation and coupled to one or more field devices. Field devices, which can be, for example, valves, valve positioners, switches, and transmitters (eg, temperature, pressure, and flow sensors) perform functions in the process, such as opening or closing valves and measuring process parameters. The process controller receives signals indicative of process measurements taken by the field devices and / or...

AI Technical Summary

Problems solved by technology

In general, these delays and other characteristics cannot be considered when designing or tuning a typical process control loop

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