Title :
A supervisory control approach in economic MPC design for refrigeration systems
Author :
Shafiei, Seyed Ehsan ; Stoustrup, Jakob ; Rasmussen, Henrik
Author_Institution :
Dept. of Electron. Syst., Aalborg Univ., Aalborg, Denmark
Abstract :
A model predictive control at supervisory level is proposed for refrigeration systems including distributed local controllers. Prediction of the electricity price and outdoor temperature are assumed available. The control objective is to minimize the overall energy cost within the prediction horizon. The method is mainly developed for demand-side management in the future smart grid, but a simpler version can be applied in the current electricity market. Due to the system nonlinearity, the minimization is in general a complicated nonconvex optimization problem. A new supervisory control structure as well as an algorithmic pressure control scheme is presented to rearrange the problem to facilitate convex programming. A nonlinear continuous time model validated by real data is employed to simulate the system operation. The results show a considerable economic saving as well as a trade-off between the saving level and the design complexity.
Keywords :
concave programming; continuous time systems; control system synthesis; cost reduction; nonlinear control systems; power markets; power system economics; predictive control; pressure control; refrigeration; algorithmic pressure control scheme; demand-side management; distributed local controllers; economic MPC design; economic saving; electricity market; electricity price prediction; energy cost minimization; future smart grid; model predictive control; nonconvex optimization problem; nonlinear continuous time model; outdoor temperature prediction; prediction horizon; refrigeration systems; supervisory control approach; system nonlinearity; Compressors; Economics; Electricity; Refrigerants; Temperature measurement; Valves;
Conference_Titel :
Control Conference (ECC), 2013 European
