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EPE Journal Volume 24-4 - Papers
- Flying Capacitor Resonant Pole Inverter Topology with Reduced Switch Voltage Stress
- Modeling and Experimental Study of Three-phase Improved Switched Inductor Z-Source Inverter
- Hardware-in-the-Loop Emulation of Electrical Drives Using Standard Voltage Source Inverters
- Analysis and Comparison of Overmodulation Algorithms for Space Vector Modulated Voltage Source Inverter
- High frequency current probes for common-mode impedance measurements of power converters under operating conditions
- Energetic Macroscopic Representation and Optimal Fuzzy Logic Energy Management Strategy of a Hybrid Electric Locomotive with experimental characterization of...
EPE Journal Volume 24-4 - Editorial
By Martin Doppelbauer
It is my pleasure to announce the 18th European Conference on Power Electronics and Applications. The conference will take place in Karlsruhe, Germany, from the 6th to 8th September 2016.
EPE Journal Volume 24-4 - Papers
By J. J. C. van Emden; J. van Duivenbode; J. L. Duarte
Increasing the bus voltage in high power applications has reached a limit for non-multilevel converters. This is caused, amongst others, by susceptibility to single event burnout induced by cosmic radiation. Single event burnout has a strong correlation to the voltage stress over the switching device. This paper proposes a soft switching multilevel converter to raise the power limit and reduce the susceptibility to cosmic radiation by adding a flying capacitor to a resonant pole inverter. A laboratory test circuit is built, and the circuit operation shows satisfactory agreement with the theoretical analysis and simulation results. The experimental results show that this converter module reliably reduces the voltage stress over the devices without interfering with the zero voltage switching capabilities. This is done with relatively low added complexity.
By Mohamed A. Ismeil; Mohamed Orabi; Ralph Kennel; Haitham Abu-Rub
This paper presents the detailed modelling and experimental verification of a proposed three-phase Improved Switched Inductor Z-Source Inverter (ISL ZSI). Because of the limitations of classical Z-source inverter, the ISL ZSI has been proposed to increase the conversion voltage gain, to reduce the voltage stress on the capacitor of Z-network and to remove the inrush current. In this paper, a detailed model of the proposed inverter is presented and analyzed. PWM control and relationships of voltage gain and voltage stress versus modulation index are explained. Then, a detailed loss model for the ISL ZSI is derived. Simulation results are obtained to confirm the proposed topology and its loss model. Then, a prototype of 250 W is presented and experimentally tested. A good match is obtained for calculation, simulation and experiment.
By Guangye Si; Julien Cordier; Ralph M. Kennel
Testing voltage source inverters (VSI) by using a set of real machines is often unsatisfactory. In fact, besides not being economical, this method only allows cursory inspection since the behaviour of an inverter under test (IUT) can then almost be assessed under few typical working conditions. In order to overcome these drawbacks, the present paper describes a low-cost hardware-in-the-Loop (HiL) emulator for electric drives based on commercial IGBT voltage source inverters (VSI), the Virtual Machine (VM). Making use of several parallel-connected standard VSIs of the same type as the IUT, the VM is able to reproduce not only the steady state but also the dynamics of a real induction motor in a realistic way. This essential aspect is achieved by switching the IGBTs inside the inverters of the VM sequentially. Since the proposed HiL emulator is fully parameterizable, almost every induction machine within the power range of the IUT can be emulated. With the VM, extensive tests of power electronics devices can be carried out inexpensively and in short time intervals, a very convenient feature, especially for Small and Medium Enterprises (SMEs).
By Manoj Kumar Modi; S. Venugopal; G. Narayanan
Overmodulation increases the DC bus utilization in a voltage source inverter, but also requires significantly higher computational effort than linear modulation. The standard two-zone overmodulation algorithm and its two variants are analyzed and compared theoretically as well as experimentally in this paper. All three algorithms maintain proportionality between the reference voltage and applied voltage up to the six-step mode. Compared to the standard algorithm, variant-I reduces the computational overhead significantly, while increasing the harmonic distortion considerably. Variant-II, which is proposed here, reduces the computational burden further; the corresponding harmonic distortion is significantly lower than that of variant-I, and only moderately higher than that of the standard algorithm. The analysis of the three algorithms indicates the possibility of numerous overmodulation algorithms. A new overmodulation algorithm is designed for illustrative purpose. A generalized overmodulation algorithm is presented.
By Carlos Cuellar; Nadir Iidir; Abdelkader Benabou; Xavier Margueron
Two current probes are designed with the appropriate magnetic material in order to make impedance measurements in High Frequency (HF) using the Current Injection Method (CIM). These probes are then used to measure the common mode impedance of power converters in real-operating conditions. The characterization of this impedance is required for a correct EMI filter design. In this paper, a simple formulation of the probe transfer impedance, based on S-parameters, is proposed. These probes allow improving the accuracy of impedance measurements in a wide frequency range, up to 100 MHz. The measured impedances of the power converter are then applied in the design of the common mode EMI filter under real operation conditions. The obtained insertion losses of the filter are finally compared with those measured under 50 Ω - 50 Ω.
By J. Baert; S. Jemei; D. Chamagne; D. Hissel; S. Hibon; D. Hegy
The simulation of a Hybrid Electric Locomotive (HEL) using the Energetic Macroscopic Representation (EMR) is suggested in this paper. Firstly, on-board primary (diesel driven generator set) and secondary sources’ (batteries and Electric Double-Layer Capacitors) dynamical models are developed. EMR is a graphical tool using interconnected blocks where components are described according to the physical causality. Secondly, Nickel-Cadmium battery cells’ experimental characterization, for different working temperatures, is presented. Experiments aim at determining the behavior of such a technology at extreme temperatures and different States Of Charge (SOC). Then, based on the dynamical models and the experimental results, the paper presents the implementation of a real time Energy Management Strategy (EMS) based on Type-2 Fuzzy Logic. The EMS does not necessitate prior knowledge of the driving cycle and the fuzzy logic controller design is performed using a genetic algorithm. It also takes into account the intrinsic characteristics of the on-board sources (response time, reversibility, power and energy density…). Results show the efficiency of this EMS regarding the diesel engine use.
EPE Journal Volume 24-4: In Memoriam
By Brigitte Sneyers
It is with great sadness that EPE Association has to announce the death of our colleague and friend Dr. Colin Oates.