Hybrid Electric Boat based on variable speed Diesel Generator and lithium-battery - using frequency approach for energy management

International audienceThis paper presents energy management improvement for a Hybrid Electric Boat (HEB) applications using frequency approach. A variable speed Diesel-Permanent Magnet Generator (Diesel-PMG) is assisted by the lithium-battery to satisfy energetic demand of HEB. The lithium-battery module is connected to DC-bus through a buck-boost converter, and that of the variable speed Diesel Generator, it is connected to DC-bus using three phase controlled rectifier. The two DC/AC converters connected to two electric motors are used as thrusters system which enables to emulate energetic demand of Hybrid Electric Boat (HEB) in propulsion operations. The power requirement of thrusters is added to embedded appliances demand to obtain load's profile. The contribution of this paper is focused on load's profile sharing between a variable speed Diesel Generator and Lithium-battery according to the dynamic responses of sources. The performances of proposed method are evaluated through some simulations using MATALB/Simulink software

Supercapacitor Characterization Using Fluctuating DC Current - Impacts of State of Charge, Number of Cycle and Frequency on Cell Resistance and Capacitance

International audienceThis paper presents the supercapacitor parameters variations due to state of charge (SOC), the number of cycle (NbCy) and frequency of DC-current in ambient temperature tests conditions. The goal of this study consists to show the parameters evolution which can serve to determine the lifetime of supercapacitor for different conditions of use. The contribution of the paper is focused on the impacts of DC-current frequency coupled to number of cycle on supercapacitor resistance and capacitance. The proposed method uses several DC-current profiles based on fluctuations and no fluctuations consideration. To do the supercapacitors characterization, the experimental tests based on charge and discharge operations with dynamic (fluctuating) DC-current are done. The experimental tests results are presented and the impacts of state of charge, the number of cycle and frequency of DC-current are analyzed

Multi-physical characterization of supercapacitor

International audienceThis paper presents the supercapacitor parameters variations due to number of cycles (NbCy), the frequency of DC-current and the temperature. The goal of this study consists to show the parameters evolution which can serve to determine the supercapacitor energetic performances limits estimation for different conditions of use. The contribution of the paper is focused on the impacts of charge/discharge DC-current's frequency, the temperature and the number of cycles on supercapacitor resistance and capacitance. The proposed method uses several DC-current profiles based on fluctuations and no fluctuations consideration. To do the supercapacitor stress tests, the experimental tests based on charge and discharge operations with fluctuating DC-current are done. To do estimation of the series resistance and capacitance (characterization) a constant DC-current without any fluctuations consideration is used. The experimental tests results are presented and the impacts of the number of cycles, the frequency of DC-current and the temperature are analyzed

Characterization of supercapacitor based on using conditions impacts evaluation on cell resistance and capacitance

International audienceThis paper presents the supercapacitor parameters variations due to state of charge (SOC), the number of cycles (NbCy), the frequency of DC-current combined to temperature. The goal of this study consists to show the parameters evolution which can serve to determine the lifetime of supercapacitor for different conditions of use. The contribution of the paper is focused on the impacts of charge/discharge current's frequency and the temperature coupled to number of cycles on supercapacitor resistance and capacitance. The proposed method uses several DC-current profiles based on fluctuations and no fluctuations consideration. To do the supercapacitors characterization, the experimental tests based on charge and discharge operations with fluctuating DC-current are done. The experimental tests results are presented and the impacts of state of charge, the number of cycles, the frequency of DC-current and the temperature are analyzed

Energy Management in Hybrid Electric Boat Based on Frequency Distribution Approach - Using Diesel, Lithium-Battery and Supercapacitors

International audienceThis paper presents energy management improvement for a Hybrid Electric Boat (HEB) using frequency approach. Diesel generator is assisted by supercapacitors and lithium-battery to satisfy energetic demand of hybrid electric boat. Supercapacitors and lithium-battery are linked to DC-bus through two bidirectional converters, and diesel generator is connected to DC-bus using three phase controlled rectifier. DC/AC converters connected to two electric motors are used as thrusters system which enables to emulate energetic demand of Hybrid Electric Boat (HEB) in propulsion operations. The power requirement of thrusters is added to embedded appliances demand to obtain load's profile. The contribution of this paper is focused on load's profile sharing between Diesel generator, supercapacitors and lithium-battery according to the dynamic responses of these sources. Proposed method performances are evaluated through some simulations using MATALB/Simulink software