| Autor: |
Vrecko, Darko, Nerat, Marko, Vrancic, Damir, Dolanc, Gregor, Dolenc, Bostjan, Pregelj, Bostjan, Meyer, Fabien, Fai, Siu, Makkus, Robert, Juricic, Dani |
| Zdroj: |
ECS Transactions; May 2017, Vol. 78 Issue: 1 p265-274, 10p |
| Abstrakt: |
Running SOFC power systems at the edge of efficiency and maximal longevity is important for their successful market deployment. In this paper, we argue that in order to reach this goal, the conventional control solutions do not suffice. In fact, to properly handle variable load conditions and inevitable degradation processes, on-line optimization is needed to adjust the process variables to run the process at the operational optimum. We propose a two-level control system in which the low-level control is upgraded with a supervisory optimizer. The optimization problem targets maximisation of efficiency and minimization of stack temperature violations. It is solved by using the extremum-seeking approach where optimum is sought directly on the process. The results are adjusted references for the low-level controllers. The proposed supervisory optimizer is assessed on a physical model of a 2.5 kW SOFC power system on a standard daily current load profile of residential houses. Simulation results indicate that thanks to the optimizer, efficiency of the system can be improved by about 8% compared to the conventional control scheme with the low-level controllers. Due to its simplicity, the optimizer appears appropriate for practical applications. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
