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Energy Technologies for Future Grids (ETFG), IEEE International Conference on

作者： Anmol ratna Saxena Ashima Kulshreshtha Department of Electrical Engineering National Institute of Technology Delhi Delhi Bharat India R&D Validation Engineer Signify Innovations Lighting Noida Bharat India

In dc off-grid systems, each solar photovoltaic (PV) source is conventionally connected in parallel to the dc bus using a second-order boost converter which also performs maximum power point tracking (MPPT). However, this requires multiple dc-dc converters leading to higher component count, lower system efficiency, sub-system interactions, etc. In order to obviate these issues a three-port (double input and single output) fifth-order dc-dc boost converter (FOTPC) is proposed and analyzed, in this paper, for interfacing a couple of solar PV sources with a dc bus in an off-grid systems. The converter has two switches that can be individually controlled to regulate the maximum power point of both solar panels over a wider range of PV voltage and current variation. The operating modes of the converter are described for power extraction from both sources. The paper also presents the steady-state and time-domain analysis of the converter in continuous-conduction mode. Small-signal discrete-time model of FOTPC is developed and used for controller design and stability analysis. The converter operation is validated on a 48 V bus system with nominal power of 200 W.

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decreasing the exhaust outlet temperatures on a class III bus with the lowest impact on the exhaust backpressure and the fuel consumption

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AIP Conference Proceedings 2017年第1期1863卷

作者： E. Aslan Y. Ozturk S. dileroglu *R&D Engineer (Design) Powertrain Group Anadolu Isuzu Kocaeli Turkey †R&D Engineer (Simulation) Test and Validation Group Anadolu Isuzu Kocaeli Turkey ¶*R&D Engineer (Test) Test and Validation Group Anadolu Isuzu Kocaeli Turkey

The focus of this study is to determine the most appropriate exhaust tail pipe form among three different type of designs with respect to their temperature loss efficiency for a 9.5m intercity bus equipped with an Euro VI diesel engine and an automated transmission. To provide lower temperatures at the exhaust outlet, mentioned designs were submitted on to a CFd simulation using Ansys Fluent 17.1, while for manufactured products, temperature measurement tests were conducted in an environmental chamber with Omega K-type thermocouples, and Flir T420 thermal camera was used to monitor outer surface temperature distributions to make a comparison between theoretical and practical results. In order to obtain these practical results, actual tests were performed in an environmental chamber with a constant ambient temperature during the vehicle exhaust emission system regeneration process. In conclusion, an exhaust tail pipe design with a diffuser having a circular contraction and expansion forms is designated since it was the most optimized option in terms of temperature loss efficiency, inconsiderable exhaust backpressure increase and manufacturing costs.

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