Simulator · PID control

PID control: from the basic loop to field tuning

ON/OFF vs PID, the P, I and D actions, how to learn the process with a step test, tuning methods and autotuning, PID forms and units across devices, the problems you see most in the plant, and pump intake pressure control on an electric submersible pump. Dynamic models with dead time, noise and real actuators.

The loop: ON/OFF or PID

Tank with a fill pump and a demand that empties it.

Speed

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    P, I and D actions

    Water network pressure controlled by pump speed.

    Speed

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      Know your process

      Every time you pick the process its parameters change: as in the field, you do not know them until you measure them.

      Speed

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        Tuning

        Your tuning

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          Forms and units

          Enter a tuning in ideal form (the most common) and see how other devices express it.

          Ranges (for engineering units)

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            Every manufacturer shows the PID its own way. The tuning is the same, but the numbers change.

            Field problems

            Speed

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              ESP: PIP control

              Well with an electric submersible pump at 7,000 ft. The drive PID holds pump intake pressure (PIP) by moving the frequency.

              Well events

              Speed

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                Applications

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                  Set Kc, Ti and Td and tap "Test tuning": the simulator applies a setpoint change and a disturbance, then grades the result.

                  What is wrong?

                  Real loop trends: diagnose what is wrong with each one.

                  Correct0
                  Case1 of 8

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                    Educational simulator with simplified models · Does not replace plant procedures or the equipment manual · Read full notice

                    Educational simulator by JAC Engineering SAS. Processes are modeled as first-order-plus-dead-time or integrating systems, with noise and non-ideal actuators; the well uses a linear productivity index and a generic pump curve. Tuning methods are those published in the control literature (Ziegler-Nichols, Cohen-Coon, IMC/lambda, SIMC, Åström-Hägglund). Before changing a real loop: coordinate with operations, record the current values and respect the process safety limits.