Experimental Comparison of Three Real-Time Optimization Strategies Applied to Renewable/FC-Based Hybrid Power Systems Based on Load-Following Control

Nicu Bizon and Mihai Oproescu
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Nicu Bizon: Faculty of Electronics, Communications and Computers Science, University of Pitesti, 110040 Pitesti, Romania
Mihai Oproescu: Faculty of Electronics, Communications and Computers Science, University of Pitesti, 110040 Pitesti, Romania

Energies, 2018, vol. 11, issue 12, 1-32

Abstract: Besides three different real-time optimization strategies analyzed for the Renewable/Fuel Cell Hybrid Power Systems (REW/FC-HPS) based on load-following (LFW) control, a short but critical assessment of the Real-Time Optimization (RTO) strategies is presented in this paper. The advantage of power flow balance on the DC bus through the FC net power generated using the LFW control instead of using the batteries’ stack is highlighted in this study. As LFW control consequence, the battery operates in charge-sustained mode and many advantages can be exploited in practice such as: reducing the size of the battery and maintenance cost, canceling the monitoring condition of the battery state-of-charge etc. The optimization of three FC-HPSs topologies based on appropriate RTO strategy is performed here using indicators such as fuel economy, fuel consumption efficiency, and FC electrical efficiency. The challenging task to optimize operation of the FC-HPS under unknown profile of the load demand is approached using an optimization function based on linear mix of the FC net power and the fuel consumption through the weighting coefficients k net and k fuel . If optimum values are chosen, then a RTO switching strategy can improve even further the fuel economy over the entire range of load.

Keywords: fuel cell system; fuel economy; hybrid power systems; unknown load demand; real-time optimization; control loops switching strategy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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