40,996 research outputs found
The optimum size of the abalone, Haliotis diversicolor supertexta Lischke, for releasing program in the Mao Aw gulf of northeastern Taiwan
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Static Analyses of Rigid Frame Structures by the Spline Collocation Element Method(SCEM)
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CO2-stable alkaline-earth-free solid oxide fuel cells with Ni0.7Co0.3O-Ce0.8Sm0.2O1.9 composite cathodes
No full textOne of the main problems for the deployment of intermediatetemperature solid oxide fuel cells (IT-SOFCs) is their chemical stability, since most of SOFCs contain alkaline-earth metal elements (Ba, Sr and Ca) that easily react with CO2 forming carbonates. To tackle this problem, we performed a systematic investigation of a series of Ni0.7Co0.3O-Ce0.8Sm0.2O1.9 (NC3OSDC) composite cathodes, which are CO2-stable and alkalineearthfree compounds. In this work, NC3O-xSDC (with x = 0-60 wt.%) samples were synthesized by self-propagating combustion method and investigated as new cathode materials for oxygen-ion conducting SOFCs. The thermal stability and phase structure of NC3O polycrystalline powders were studied using TG-DTA and XRD analysis, which confirmed that NC3O is chemically compatible with SDC. The electrical conductivity and thermal expansion of the NC3O-xSDC samples were measured. The electrochemical properties of NC3O-xSDC/SDC/NC3O-xSDC cells were studied using electrochemical impedance spectroscopy measurements. Among the NC3O-xSDC series, NC3O-30SDC showed a minimum in cathode polarization resistance, being 0.071 Ω cm2 at 800°C. A maximum power density of 200 mW/cm2 at 600°C was obtained using anode-supported SOFCs
Capacity Allocation and Optimal Control of Inverter Air Conditioners Considering Area Control Error in Multi-Area Power Systems
No full textAir conditioners (ACs) have been widely considered as one of the most important reserve resources for power systems. However, few attentions have been given to inverter ACs (IACs), which account for a larger share nowadays and show more suitable characteristics than regular ACs to provide reserve. Moreover, interconnected power systems are becoming increasingly large and complex, which puts forward higher request on the reserve resources for the system's reliability and safety. Dealing with the above-mentioned challenges, this paper proposes a novel frequency regulation model of multi-area power systems considering large-scale IACs providing regulation service. In order to decrease the impact on customers' comfort, the action number constraint (ANC) and action time constraint (ATC) of IACs can be set by each customer. On this basis, the scheduling model of IACs considering ANC and ATC is proposed in multiple time scales, in which the total regulation capacity of IACs can be allocated among days in the month and areas in the multi-area power systems. Besides, the control parameters of IACs can also be optimized by the proposed optimization model for minimizing the area control error of the power system. The effectiveness of the model and method are verified in the numerical studies
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