Design of a medium voltage power converter-storage devices embedded in a hybrid emergency network for more electrical aircraft

Experimental validation of a hybrid emergency network with low and medium voltage Li-Ion batteries for more electrical aircraft

“…A diode bridge is connected between the generator and the DC bus capacitance to rectify the voltage. Several studies [7,8] have showed that the hybridization of the RAT with storage technologies (supercapacitors or batteries) allows increasing system performance and decreasing the RAT sizing (weight, volume). The hybridization is based on the principle of power sharing where the average power is supplied by the main power source (i.e the RAT) while transient load is fed by the storage device.…”

“…A recent study has been carried out to estimate the best connection voltage of the accumulator in terms of mass and efficiency for the embedded power electronics together with the battery bank [8]. A 540V HVDC (High Voltage Direct Current) bus feds the high power essential loads such as flight controls surfaces (FC), de ice or emergency braking for a maximum consumption estimated to 27kW.…”

“…Some conventional equipments, which depend on hydraulic or pneumatic power, are more and more substituted by electrical systems such as flight control actuators [2], de/anti icing or air conditioning systems [4]. Hence, the demand for embedded electrical power has significantly increased [2,5,6,7,8]. Increasing electricity power in modern aircrafts also allows changing actual emergency appliances, using almost exclusively electrical energy in the case of total power loss during engines failure.…”

“…This turbine is currently designed to provide the maximum power that aircraft may require during emergency mission. A previous study has demonstrated that significant reduction in weight and volume of the whole emergency system can be obtained by hybridizing the turbine with a storage device [7,8]: about 25% of mass reduction could be expected on the system. This paper presents an emergency sub network in which the RAT is hybridized with a Li-Ion accumulator.…”

“…An experimental validation of the hybridization concept with a low voltage lithium ion battery (28V being the classical voltage standard for batteries) on a test bench has been done. A design study to estimate the best connection voltage of the accumulators has been carried out [8]. The results of this study have showed that an optimum for the connection voltage appears to be between 200V and 300V in terms of power electronic structure and battery trade off.…”