between ratio control, cascade control, and feedforward control which of these is best for Drum Level and combustion control

 

between ratio control, cascade control, and feedforward control which of these is best for Drum Level and combustion control

Of the systems that I have worked with, drum level is cascade control with feedforward trim and combustion control is ratio+ cascade + feedforward trim but then again it all depends upon the consultant and to the OEM about how they want to implement it. But generally it is a mix of different control methods with override logics as no single stand alone control method is feasible.