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RISS 인기검색어
- 검색키워드
- 저자 : Marc Hiller (검색결과 5 건)
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High performance switched reluctance drives with wide field weakening range
Rainer Marquardt,Marc Hiller 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
For electrical vehicles, switched reluctance drives present a promising alternative - compared to asynchronous and synchronous (permanent magnet) concepts. For these applications, a very wide field weakening range is a key issue. Other requirements include high torque output from a small machine and low current ripple at the DC-side without the use of bulky filters - when powered from fuel cells or advanced Lithium-Ion-batteries. A new converter and control strategy according to these requirements is presented and compared to existing designs. The comparison is done for a drive system with a continuous power rating of 30 to 40 kW.<br/>
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A Non-Resonant Multi-Output Half-Bridge Inverter for Flexible Cooking Surfaces
Felix Rehm,Marc Hiller 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
In domestic induction heating (IH) appliances most commonly the series resonant half-bridge (HB) inverter is used. The number of required components can be further reduced by using non-resonant inverter topologies. Within this contribution, a novel non-resonant multi-output HB inverter for use in flexible cooking surfaces is presented. The proposed inverter topology is described and simulation as well as measurement results are shown. Measurement results are presented for operation with up to two inductors. The hardware prototype is equipped with gallium nitride semiconductors and operates at switching frequencies up to 400 kHz. Measurement results show that an output power of 522W is reached for use of a single inductor. When using two inductors, a maximum output power of 828W is reached. The presented results demonstrate the feasibility of the concept, while the efficiency of the system needs to be investigated in future work.
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A Hybrid Medium Voltage Multilevel Converter with Parallel Voltage-Source Active Filter
Daniel Bernet,Lukas Stefanski,Marc Hiller 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In consequence of high semiconductor losses, gridconnected medium voltage power converters are typically operated at switching frequencies of several hundred Hertz per switch position. Therefore, conventional converter systems require bulky and expensive LCL-filters in order to meet the harmonic limits given by the grid code. It is only possible to reduce the LCL-filter costs by semiconductor current derating and operation at increased switching frequencies, leading to a reduced utilization and efficiency of the converter system. To overcome these disadvantages of conventional converter systems, the presented hybrid converter uses a parallel voltagesource active output filter and thus allows a significant reduction of the passive component demand. An excellent harmonic performance is achieved for the operation with small passive filter components, revealing the potential for increasing the power density and efficiency of high power medium voltage converters. As a result, significant reductions of the filter losses and passive components as well as an increased utilization are achieved compared to a reference LCL-filter based converter system.
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Christian Korte,Eduard Specht,Stefan M. Goetz,Marc Hiller 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
While battery-integrated modular multilevel converters are a promising alternative to conventional inverters in applications such as automobiles, they often cause significant second-harmonic pulsating currents in the batteries, increasing their degradation rate and the system losses. In this paper, we propose a control scheme for the Modular Multilevel Series Parallel Converter (MMSPC) that reduces the pulsating current seen by the batteries. A harmonic voltage is injected into the controller output voltage, allowing the converter to significantly reduce the low frequency current pulsations by switching modules in parallel more often. This is combined with a simple balancing algorithm to determine the upcoming switching states. We have shown that–without the need of additional hardware–the second-harmonic pulsation can be reduced by over 40 % using voltage injection, by taking advantage of the fact that the MMSPC can parallelize battery-modules when the output voltage is low. This may allow battery degradation to be reduced and the range of an electric vehicle with an MMSPC-system to be increased.
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Fabian Sommer,Nikolas Menger,Tobias Merz,Nils Soltau,Shiori Idaka,Marc Hiller 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
To increase the switching frequency in DC/DC converters, soft switching is necessary to limit switching losses. In case of the Dual Active Bridge (DAB), Zero Voltage Switching (ZVS) is used to reduce switching losses. Since the ZVS behavior of the DAB depends on multiple parameters, an accurate model is necessary to ensure operation with minimal losses by applying ZVS. This paper presents an accurate capacitance based time domain (CTD) model for the resonant commutation which enables the calculation of the minimal necessary current, the optimal deadtime as well as the voltage error caused by the nonideal commutation. The parasitics and therefore nonideal behavior of the MOSFETs are considered to further increase accuracy. The model can be used for all operating points commonly applied in single (SPS) and triple phase shift (TPS) modulation. Measurement results obtained with a 500 kW DAB prototype proves the high accuracy of the model.
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