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Cascade controller. An example of an algorithm description

Cascade regulator


Cascade regulator
A cascade controller is a control algorithm (usually used in process circuits in the petrochemical industry) that uses two links, fast and slow. The fast one is able to stabilize the circuit in a short period of time, the main link or the slow circuit is rather a circuit for targeting. Dual PID control thus allows better process tuning. At the same time, we use one crane (regulator) in the system, and two sensors by which control takes place. The first is located at the end of the circuit, the second at the beginning. The cascade PID controller itself is divided into two connected parts, the main (slow) one is the set value course setter, and the auxiliary one which controls the valve directly (the fast link).

This document considers an example of the description of the control algorithm

The document was developed with the aim of a clear and understandable presentation of the material for both the technologist and the programmer of the middle and upper levels of this system. Separately, along the vertical lines, you can see where the signals come and go, the signals associated with the upper level are graphically described. In the middle part of the document, the control algorithm itself is drawn, demonstrating the main connections and actions of the mode switches.

In this example of the description of the control algorithm, two systems were combined.

Distributed process control system (DCS) and emergency protection system (ESD)

In addition, he described a similar method of PID regulation for controlling the supply and exhaust system of a hotel. It didn’t take long to set up, but after applying the cascade scheme, everything was fine, link.

#algorithm, #cascaderegulator, #controlalgorithm, #PID

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