Configuration method of hybrid energy storage system for high power density in More Electric Aircraft

For the safe flight of More Electric Aircraft (MEA), the hybrid energy storage system (HESS), which includes battery (Bat) and super-capacitor (SC), are used to smooth the pulse power and feedback energy in electrical power system of MEA. This paper addresses the combination of HESS by taking into account their characteristics to realize high power density in this particular application. The proposed configuration method can decrease the weight of HESS by selecting the type of energy storage system, energy storage cells and appropriate combination. Moreover, the discrete wavelet transform (DWT), which has great capability for analyzing signals, is chosen as a frequency approach to allocate the load power to Bat and SC in HESS. A simple theory proposed in this paper can solve two critical parameters, wavelet basis and decomposition level, in DWT. The case studies and results validate the feasibility and advantages of the configuration method.