An optimization and fast load-oriented control for current-based solid oxide fuel cell system

Optimization of energy management in hybrid SOFC-based DC microgrid considering high efficiency and operating safety when external load power goes up

“…6, and the optimization process has been discussed in our previous work. [38][39][40][41][42] From Fig. 6, it is seen that the system Sustainable Energy Fuels efficiency can be capable of reaching up to 44%.…”

“…Our early works have studied the structure of the SOFC system, simulation stratagem, parameter, and system-level optimization, and control strategies. [38][39][40][41][42] The battery of Li_ion is considered in our paper since it has been proven with good energy density and electrical efficiency compared to the other energy modes. The supercapacitor is oen known as the electric double-layer capacitor (EDLCs), which can charge and discharge more electrical energy because of its high capacitance.…”

“…For further analysis of the performance of the SOFC system, considering the high efficiency, model-based optimization can be performed to determine the optimal combination of the operating parameters (I s , BP, AR, FU). Our previous studies [38][39][40][41][42] have traversed the OOPs in the different external load powers for the steady-state operation, which can satisfy the efficiency optimization and thermal safety simultaneously. The OOPs and their related system efficiency and voltage outputs are shown in Fig.…”

Optimization and Control for Solid Oxide Fuel Cell System Hybrid DC Microgrids From the Perspective of High Efficiency, Thermal Safety, and Transient Response

“…Based on the performance indices discussed previously, in addition to the thermal and electrical management and constraint enforcement, the optimal operating points (OOPs) are manipulated to achieve the optimal energy efficiency through the transverse optimization process, which have been conducted in our and other's previous works (Zhang et al, 2015a;Zhang et al, 2015b;Zhang et al, 2018;Zhang L et al, 2019). The OOPs can ensure thermal safety, and high efficiency in static can be obtained, which is shown in Table 1.…”

“…A lot of researches considering the SOFC stand-alone system model with the BOP were established for the simulation and optimization in our earlier works (Zhang et al, 2015a;Zhang et al, 2015b;Zhang et al, 2018;Zhang L et al, 2019), especially the exit temperatures, species molar fractions, and molar flow rates of each control volume, which can be divided into the gas phase and solid phase, as shown in Figure 3, have been obtained from the transient energy, species, and mass conservation equations, respectively. These conservation equations are of the same general form within various system components in Table 2.…”