Techno-economic optimization of a supercapacitor-based energy storage unit chain: Application on the first quick charge plug-in ferry

International audienceThis article elaborates a techno-economic approach that aims to optimize the conversion and energy storage unit chain of the first quick charge plug-in ferry. The choice of supercapacitors is motivated and then compared to other energy storage units for different kind of ferry exploitation. Several models were developed to be coupled with a global techno-economic model considering an exploitation strategy. In the last part, a typical application illustrates the cost reduction compared to the standard sizing approach

Techno-economic Optimization of Flywheel Storage System in transportation

Energy storage technologies in transport applications are continuously improved and updated to ensure energy demand, to decrease the fuel consumption and in order to make systems more reliable. Flywheel kinetic energy storage offers very good features such as power and energy density. Moreover, with some short-range vehicles such as buses or small ferries, this technology can be enough to supply all the energy to the power train.The challenges to be met to integrate such technology in vehicles are the mass, the efficiency and especially the cost. Then, in this paper, a techno-economic optimization of a flywheel energy storage system is presented. It is made up of a flywheel, a permanent magnet synchronous machine and a power converter. For each part of the system, physical and economical models are proposed. Finally, an economic optimization is done on a short-range ship profil, currently using supercapacitors

Accurate sizing of supercapacitors storage system considering its capacitance variation.

International audienceThis paper highlights the energy errors made for the design of supercapacitors used as a main energy source. First of all, the paper presents the two definitions of capacitance of a capacitance-voltage dependent material. The number of supercapacitors is important for the application purchasing cost. That is why the paper introduces an analytical model and an electrical model along with an identification method for the capacitance variation. This variation is presented and compared to the manufacturer value in order to underscore the energy error between the manufacturer, the constant approximation and the first order approximation which interests us here. This paper also presents the sizing aspect considering the losses associated to a constant-current charging mode in order to minimize the electrical losses. At last, an application case compares the number of supercapacitors for different approximations of the capacitance