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3 Element Control for Boiler Drum
Looking for information on HRSG three element level control

I am an operating engineer in combined cycle power plant. I need any manuals or information on HRSG three element level control (tuning, how effective, problems, improvements).

my email is (

Three Element control is used where load is dynamic in nature or continuously changing. where BFW Pump is used to feed multiple boiler and header pressure and flow changes according to demand three element is preferred.

1st Element is Steam Flow leaving the boiler, 2nd element is BFW flow, 3rd element is Steam drum Level.

I will provide you the logic used for three element.