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Hysteresis modulator is one of modulation techniques widely used in motor drives, acting as current controlled source. Hysteresis modulator needs to be implemented in analog circuits so that it is to maintain measured phase current with a certain tolerance of the desired phase current through fast sampling frequency.
Adaptive Maximum Torque Per Amp control strategy was proved to be one of control strategies to drive induction motor in high efficiency. This control strategy is based on Alternate QD Model which represents mathematical model of induction motor in highly good accuracy. However, the control strategy was validated only at heavy load of 150 Nm. Thus, in this work, efficiency of Alternate QD Model based...
The DC capacitor bank is an expensive and bulky component, particularly in automotive applications. Its selection is subject to a number of competing constraints and is often sub-optimal. This paper proposes a generalized design methodology for the capacitor bank and introduces several optimization approaches under the umbrellas of convex, heuristic and pseudo optimization. Simulated annealing, a...
Synchronous reluctance machines (SynRM) are increasingly considered as viable alternatives to conventional electrical machines in different applications. Regarding traction drives, this machine type should be studied further with respect to the basic requirements, namely efficiency, low cost and high power density.
In response to the ever increasing pollution levels and depleting fossil fuels, Plug-in Electric vehicle, hybrid electric vehicle and Electric vehicle (xEVs) technologies are emerging successfully in the automotive industry. The range anxiety issue of the xEVs customers are being addressed through various charging methods. The major hurdle in adoption of xEV is deployment of charging infrastructure...
In the city of Braunschweig five inductive charging stations for electric bus charging have been installed within an earlier research project named emil (“Elektromobilität mittels induktiver Ladung” -translated “E-Mobility using inductive charging”). Further research activities focus now on charging cars on the bus-system ground units. This paper shows the conceptual design and the required measurements...
This paper presents the results of the influence of an active battery switching system on the drivetrain efficiency of electric vehicles. The purpose of this system is to increase the drivetrain's electrical efficiency, especially in the partial-load range. It consists of a switching unit that allows the vehicle's tractionbattery circuitry to be changed during operation, thereby adjusting the intermediate...
Due to the rising electrification rate and increasing battery capacities there is a need for higher charging performance of wireless power transfer (WPT) systems in electric vehicles to keep pace with technological progress and tethered charging. The coil system has to be designed with adequate coupling and a high displacement rate as well because autonomous positioning systems are still in development...
In this paper, the harmonic content of the battery current in a commercial hybrid vehicle (bus) is measured and analyzed for a number of different driving situations. It is found that the most prominent harmonic reaches peak magnitudes that can be higher than 10% of the maximum dc-current level with a maximum frequency less than 150 Hz. Further, it is found that this harmonic can be approximated using...
The present paper focuses on the model-based development of an electric vehicle, FreDy, equipped with direct drives on the rear axle positioned in proximity to the wheels. FreDy is a fully active electric vehicle combining electric traction with an intelligent chassis consisting of four independent active wheel modules. By using a hierarchically structured vehicle management the research vehicle FreDy...
The increment in global electricity consumption is triggering that energy efficiency becomes a priority for governments. In that way, a massive penetration of electric vehicles is in the focus at their efficient integration in energy markets. This paper presents an evaluation of different strategies for Aggregator to manage charging EV batteries, from a previous work that presented a smart charging...
Five-level dual-flying-capacitor active-neutral-point-clamped converter (5L-DFC-ANPC) exhibits attractive properties, e.g., soft switching possibilities of line frequency switches, elimination of the transient voltage balancing snubbers, more even loss distribution, etc. Therefore, it has become a very attractive topology to electrical drives, e-mobility, grid-tied photovoltaic applications, etc....
Vehicle to Grid (V2G) technology enables Battery Powered Vehicles including Electric and Plugin Hybrid Electric Vehicles as distributed Energy Storage for the smart grid. V2G inverters are advanced power converters that provide active and reactive bidirectional power flow between the grid and the onboard energy storage. A V2G power conditioner includes a high frequency isolated dc-dc converter and...
Direct model predictive control (DMPC) is a simple and powerful method for power converters, thanks to its fast control dynamics and the capability to deal with multiple constraints. Weighting factors are typically the only adjustable parameters in the cost function but will affect the performance of system dramatically. The selection of the weighting factors is usually tedious and can be considered...
The development of high-power electric vehicle (EV) fast charging stations (EVFCSs) that are directly tied to the medium-voltage (MV) grid is a promising solution to shorten the charging time for EVs. The cascaded-high-frequency-link (CHFL) system-based charging station provides an isolated power electronic interface between the low voltage (LV) DC bus (inside the station) and the three-phase MV AC...
Battery electric vehicles suffer from significant range reduction in extreme cold weather conditions, largely due to the requirement of cabin heating and reduced battery performance. Since heating can require as much energy as the powertrain itself, improving the vehicle thermal energy management can have a substantial impact on range in cold driving conditions. In this paper, sensible and latent...
The dual active bridge (DAB) converter is ideally suited for electrified vehicle applications for its galvanic isolation, bidirectional power flow and inherent soft-switching capability. However, when conventional single-phase-shift (SPS) modulation is applied, zero-voltage switching operation is limited by wide voltage range of high voltage and low voltage batteries, especially under light load condition...
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