PID & DO control
PID & DO control
(OP)
Anyone have any experience using PID controls to control DO via airation?
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RE: PID & DO control
saxon
RE: PID & DO control
But it is a spectacularly unstable process, non of my normal PID tuning methods seem to be working well enough to let me get a P band of less than 50% which is better than the previous controller was managing but I feel I should be able to improve it.
I was hoping for someone who has done it already, it’s quite a common process in water treatment
RE: PID & DO control
PID controls very common but you often use two or more to control the process. For example use a loop to control actual DO against DO setpoint in each aeration zone. You want to use a different loop to then control the blowers against an aeration set point. I have also been involved with systems where separate flow set points are used which can provide a more stable DO band. Basically the design depends on the diurnal variation oxygen demand and the rate of change which is a function of the sewage works catchment.
Jonelv
RE: PID & DO control