Hi, Does anyone have any practical thoughts or experience with the following control situation?
2 identical tanks side by side, inflows are separate, wild and unmeasured. Outflows are separate and controlled. About half way up the tanks there is a large equalising line, big enough that the level in a tank will more or less be pinned upwards if that tank is overflowing through the equaliser into the other one. So there are effectively 3 modes of operation, if symmetries are rolled in:Both tanks below equalising line, ie. 2 separate tanks. One tank above, one below the equaliser, overflowing Both tanks above, effectively one tank.
What's required is a level control strategy adjusting the two outflows that will allow the levels to float somewhat in the middle, but keep both within working limits. The upper working limit has to be above the equaliser for residence time reasons.
Appreciate that the problem is somewhat underspecified. Also that there's a fundamental observability problem while the overflow is active. I just thought that someone somewhere might have tackled this already. TIA