Practical control schemes of a battery/supercapacitor system for electric vehicle

Castaings, Ali; Lhomme, Walter; Trigui, Rochdi; Bouscayrol, Alain

doi:10.1049/iet-est.2015.0011

Cited by 32 publications

(19 citation statements)

References 33 publications

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“…When the EV decelerates or degrades, the power system is in an energy feedback state; thus, the SC can more efficiently and quickly absorb feedback energy, improve the energy efficiency of the system, and protect the battery from heavy currents. There are four common structures of HESS composed of two energy storage devices and one load device [38][39][40][41]:…”

Section: Hybrid Energy Storage Systemmentioning

confidence: 99%

An Improved SOC Control Strategy for Electric Vehicle Hybrid Energy Storage Systems

Wang

et al. 2020

Energies

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In this paper, we propose an optimized power distribution method for hybrid electric energy storage systems for electric vehicles (EVs). The hybrid energy storage system (HESS) uses two isolated soft-switching symmetrical half-bridge bidirectional converters connected to the battery and supercapacitor (SC) as a composite structure of the protection structure. The bidirectional converter can precisely control the charge and discharge of the SC and battery. Spiral wound SCs with mesoporous carbon electrodes are used as the energy storage units of EVs. Under the 1050 operating conditions of the EV driving cycle, the SC acts as a “peak load transfer” with a charge and discharge current of 2isc~3ibat. An improved energy allocation strategy under state of charge (SOC) control is proposed, that enables SC to charge and discharge with a peak current of approximately 4ibat. Compared with the pure battery mode, the acceleration performance of the EV is improved by approximately 50%, and the energy loss is reduced by approximately 69%. This strategy accommodates different types of load curves, and helps improve the energy utilization rate and reduce the battery aging effect.

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Section: Hybrid Energy Storage Systemmentioning

confidence: 99%

An Improved SOC Control Strategy for Electric Vehicle Hybrid Energy Storage Systems

Wang

et al. 2020

Energies

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“…In addition, the two bi-direction DC-DC converters are required for both delivery and recovery cycles. Since energy management is at a higher layer than local control and different layers should be treated by different operating frequencies, it is supposed that the time constant of the inductor is much greater than the switching period of the DC-DC converter and the modulation frequency is sufficiently high to consider an average model [41]. Moreover, once the inner-loop subsystem is well controlled, it is assumed to respond immediately to the reference.…”

Section: Dc/dc Converter Modelmentioning

confidence: 99%

Energy Management Strategy of a PEM Fuel Cell Excavator with a Supercapacitor/Battery Hybrid Power Source

et al. 2019

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Construction machines are heavy-duty equipment and a major contributor to the environmental pollution. By using only electric motors instead of an internal combustion engine, the problems of low engine efficiency and air pollution can be solved. This paper proposed a novel energy management strategy for a PEM fuel cell excavator with a supercapacitor/battery hybrid power source. The fuel cell is the main power supply for most of the excavator workload while the battery/supercapacitor is the energy storage device, which supplies additional required power and recovers energy. The whole system model was built in a co-simulation environment, which is a combination of MATLAB/Simulink and AMESim software, where the fuel cell, battery, supercapacitor model, and the energy management algorithm were developed in a Simulink environment while the excavator model was designed in an AMESim environment. In this work, the energy management strategy was designed to concurrently account for power supply performance from the hybrid power sources as well as from fuel cells, and battery lifespan. The control design was proposed to distribute the power demand optimally from the excavator to the hybrid power sources in different working conditions. The simulation results were presented to demonstrate the good performance of the system. The effectiveness of the proposed energy management strategy was validated. Compared with the conventional strategies where the task requirements cannot be achieved or system stability cannot be accomplished, the proposed algorithms perfectly satisfied the working conditions.

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“…Although simple, the energy stored in the UC is not utilized effectively due to the absence of power converters. The slightly more robust Figure 1b shows that a power converter is added in between the BES and UC [17][18][19][20]. In this scheme, the BES is connected directly to the DC-bus instead of the UC.…”

Section: Introductionmentioning

confidence: 99%

Study of a Bidirectional Power Converter Integrated with Battery/Ultracapacitor Dual-Energy Storage

et al. 2020

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A patented bidirectional power converter was studied as an interface to connect the DC-bus of driving inverter, battery energy storage (BES), and ultracapacitor (UC) to solve the problem that the driving motor damages the battery life during acceleration and deceleration in electric vehicles (EVs). The proposed concept was to adopt a multiport switch to control the power flow and achieve the different operating mode transitions for the better utilization of energy. In addition, in order to improve the conversion efficiency, the proposed converter used a coupled inductor and interleaved-pulse-width-modulation (IPWM) control to achieve a high voltage conversion ratio (i.e., bidirectional high step-up/down conversion characteristics). This study discussed the steady-state operation and characteristic analysis of the proposed converter. Finally, a 500 W power converter prototype with specifications of 72 V DC-bus, 24 V BES, and 48 V UC was built, and the feasibility was verified by simulation and experiment results. The highest efficiency points of the realized prototype were 97.4%, 95.5%, 97.2%, 97.1%, and 95.3% for the UC charge, battery charge, UC discharge, the dual-energy in series discharge, and battery discharge modes, respectively.

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Practical control schemes of a battery/supercapacitor system for electric vehicle

Cited by 32 publications

References 33 publications

An Improved SOC Control Strategy for Electric Vehicle Hybrid Energy Storage Systems

An Improved SOC Control Strategy for Electric Vehicle Hybrid Energy Storage Systems

Energy Management Strategy of a PEM Fuel Cell Excavator with a Supercapacitor/Battery Hybrid Power Source

Study of a Bidirectional Power Converter Integrated with Battery/Ultracapacitor Dual-Energy Storage

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