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- Fast Power Semiconductors Switching Current Measurement by Current Surface Probe
- Elimination of vector changes due to sector changes with DTC
- A Resonant PWM DC/DC Converter with Coreless Transformer for Light Electric Vehicles On-Board Charger
- Adaptive Control of Hybrid Battery Energy Storage Systems under Capacity Fade
- Battery Management through PLC-CAN Communication
EPE Journal Volume 25-4 - Papers
By Ke Li; Arnaud Videt; Nadir Idir
With the advantage of high bandwidth and small insertion impedance, a current surface probe (CSP) used to measure switching current waveforms is presented in this paper. Its transfer impedance is characterized and validated by measuring an IGBT switching current that is compared with those obtained with a current probe (CP), a current shunt (CS) and a Hall effect current probe (HECP). Furthermore, by comparing with a CS to measure a GaN-HEMT switching current, it is shown that CSP is able to measure a switching current of a few nanoseconds, while it brings no influence on transistor voltage waveform measurement. The obtained results show that, the use of CSP brings little parasitic inductances in the measurement circuit and it does not bring the connection of the ground to the power converter, which is the case for the CS.
By Georg Tolstoy; Oskar Wallmark; Staffan Norrga; Hans-Peter Nee; Björn Larsson
In this paper it has been investigated if there is a possibility to reduce the switching frequency for a two-level inverter by improving the direct torque control (DTC) algorithm by adding a non-switching condition when a new sector is entered. It is believed that the DTC switching table can be improved by adding a non-switching condition when sector change occurs. This will reduce the number of switching actions by up to 12 per electrical rotation without interfering with the electrical machine performance.
By Yoon-Jae Kim; Jun-Young Lee
This paper suggests a DC/DC converter with coreless transformer for electric vehicle chargers. Since the coreless transformer has low coupling coefficient, the converter uses resonance but its power is controlled by PWM. Appropriate design of resonant capacitor improves its switching conditions of ZVS operation of all switching devices and near ZCS of bottom switches and output rectifier. Using Wheeler approximation, coreless transformer design is suggested and converter design procedure is derived under a predetermined leakage inductance of coreless transformer. The feasibility of the proposed charger is verified with a 2kW prototype designed based on the procedure.
By Nilanjan Mukherjee; Dani Strickland; Mina Abedi Varnosfaderani
There is an emerging call for applications in energy storage systems which use a mixture of batteries. These hybrid battery solutions may contain different battery types for example; using second life ex-transportation batteries in grid support applications or a combination of high power, low energy and low power, high energy batteries to meet multiple energy requirements or even the same battery types but under different states of health for example, being able to hot swap out a battery when it has failed in an application without changing all the batteries and ending up with batteries with different performances, capacities and impedances. These types of applications typically use multi-modular converters to allow hot swapping to take place without affecting the overall performance of the system. A key element of the control is how the different battery performance characteristics may be taken into account and the how the power is then shared among the different batteries in line with their performance. This paper proposes a novel control strategy which allows the power in the batteries to be effectively distributed even under varying parameter conditions such as, capacity fade conditions using adaptive power sharing strategy. The proposed strategy has been experimentally validated against a system of three different battery types connected to a grid connected multi-modular converter both with and without capacity fade mechanisms in place.
By Nicolas Ginot; Christophe Batard; Jérémie Jousse; Elisabeth Lemaire
This article presents a new method allowing data exchanges between a Battery Management System (BMS) and the application’s Energy Management System (EMS). The proposed solution is based on the Power Line Communication (PLC) technology and harnesses the versatility of the well-known Controller Area Network (CAN) protocol. This new PLC-CAN communication system is depicted in the context of the management of a distributed battery pack composed of several batteries connected in a star topology. Limits of the system are exposed, arising from the trade-off between the carrier frequency and the length of the power cables. A theoretical approach through simulation is proposed and shows the feasibility of the PLC-CAN system. Measurements realized on an experimental setup confirm the validity of this new physical medium for the CAN protocol.
EPE Journal Volume 25-4: Other
By B. Sneyers
The Call for Papers of EPE'18 ECCE Europe in Riga, Latvia, 17-21 September 2018.