Incatools blog

Non-minimum Phase PID Control

Posted by Rohit Anantulwar on Sep 28, 2021 12:41:18 PM

Non-minimum phase systems are difficult to understand and even difficult to tune manually. The understanding of non-minimum phase system and control strategies explain in this blog.

The response of a non-minimum phase system to a step input has an "undershoot". This means, if the output was initially zero and the steady-state output is positive, the output becomes negative before changing direction and converging to its positive steady-state value.These systemsare difficult to control due towaiting time until the initial undershoot for a positive gain system or overshoot for a negative gain system.

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Topics: PID tuning, Optimization

Hydrogen: Do you want to reduce the venting inside your refinery?

Posted by Akash Gupta on Sep 28, 2021 12:29:35 PM


Hydrogen is one of the key raw materials used in the refinery. It is used in various process units: Hydrocracker, Aromatic plants, to name a few. Since the process is dynamic, the demand for H2 keeps on varying, and excess is vented out either to fuel gas or to flare to control the Header pressure. The good news is that the venting of the H2 can be reduced. In some cases, it can be reduced to close to zero.

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Topics: PID tuning, Optimization