The Experts below are selected from a list of 13683 Experts worldwide ranked by ideXlab platform
Ugur Savas Selamogullari - One of the best experts on this subject based on the ideXlab platform.
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Comparison of Efficiency measurement techniques for electric vehicle traction Inverters
2015 International Conference on Electrical Engineering and Informatics (ICEEI), 2015Co-Authors: Fatih Acar, Sadik Ozdemir, Hakan Akca, Ugur Savas SelamogullariAbstract:Performance evaluation of a high-resolution computer based Efficiency measurement system for electric vehicle (EV) traction Inverter is given. First, a simulation study is carried out to determine the upper limit of the EV traction Inverter Efficiency curve. Then, experimental Efficiency measurements are completed. In the experimental study, a 30kVA induction machine-dynamometer system is used to obtain the loading between 1kW–8kW. Efficiency measurements are completed with both the YOKOGAWA WT500 power analyzer and the proposed computer based Efficiency measurement system. Results are discussed and compared considering the accuracy and the cost.
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Analyzing the effect of Inverter Efficiency improvement in wind turbine systems
2014 International Conference on Renewable Energy Research and Application (ICRERA), 2014Co-Authors: Sadik Ozdemir, Ugur Savas Selamogullari, Onur ElmaAbstract:This study presents the effect of Efficiency improvement of wind turbine Inverters-especially at low wind velocities-on generated wind energy. In order to present a detailed analysis, actual wind speed data is collected with one minute resolution in Istanbul, Turkey. The wind data is gathered at 10 meters and then projected to 30 meters. Technical data of a 20 kW wind turbine system is used to model the system and to calculate generated wind power. Data analysis shows that the wind turbine system needs to operate at low wind speed most of the time and wind turbine power electronic systems (Inverters) should be designed accordingly to maximize wind potential. Case studies are completed to assess the effect of Inverter circuit light load Efficiency improvement on the energy yield.
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Hybrid switch use for light load Efficiency improvement of a power Inverter for stand-alone residential renewable energy system
2013 15th European Conference on Power Electronics and Applications (EPE), 2013Co-Authors: Hakan Akca, Ugur Savas SelamogullariAbstract:In stand-alone residential renewable energy systems (such as solar and/or fuel cell powered), the power Inverter used for DC-AC transformation will operate at light loads, where its Efficiency is lower, most of the time during a day. Thus, improving the Inverter Efficiency at light loads will result in more efficient use of renewable energy sources. In this study, the use of a parallel IGBT-MOSFET switch combination and its unique control is analyzed for Efficiency improvement at light load conditions. Experimental results are provided for a half bridge Inverter with and without hybrid switch. It is shown that the light load Efficiency can be improved with the proposed hybrid switch use. As the use of renewable energy sources is on the rise, even the slightest increase in the Inverter Efficiency will mean large energy savings overall.
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The effect of Inverter Efficiency on stand-alone residential PV system sizing
2011Co-Authors: Onur Elma, Ugur Savas SelamogullariAbstract:Renewable energy resources have been widely adopted in the world due to environmental concerns, energy shortage, and decreasing cost of system components. Among these renewable energy sources, solar energy generation has attracted significant interest due to its easy implementation. Solar energy is especially good for residential buildings that are far from existing electrical grid. In such a solar powered stand-alone residential system, a backup source such as battery/supercapacitor is required for uninterrupted energy. The DC energy from solar panels is converted to AC energy thorough a power conditioning system. In this study, the effect of Inverter Efficiency on the backup size is analyzed. It is shown that for a reliable and correct sizing, the Inverter Efficiency that varies with loading conditions must be taken into account for stand-alone house where the demand changes within a wide range over a day.
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A Systems Approach for a Stand-Alone Residential Fuel Cell Power Inverter Design
IEEE Transactions on Energy Conversion, 2010Co-Authors: Ugur Savas Selamogullari, David A. Torrey, Sheppard J. SalonAbstract:Analysis of an experimentally measured daily load profile reveals that the residential power demand has a high percentage of low power duration over a day. In a stand-alone residential fuel cell power system, the power Inverter designed for the peak power requirement will be operating at light loads, where its Efficiency is lower, most of the time. Thus, improving the light-load Efficiency will provide considerable hydrogen (energy) savings for the stand-alone residential power system. A solution to improve the power Inverter Efficiency at light loads is proposed. Both simulation and experimental results are given. Results show that the light-load Efficiency can be improved by employing and uniquely controlling a parallel IGBT-MOSFET switch combination in a half-bridge Inverter topology. It is also shown that substantial savings on hydrogen usage can be realized through the use of new Inverter design in stand-alone operations.
Ahmad Radan - One of the best experts on this subject based on the ideXlab platform.
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Effects of Battery Pack Voltage Level on Traction Inverter Efficiency in Parallel Hybrid Electric Vehicles
International Journal of Engineering, 2015Co-Authors: Mohammad Reza Nikzad, Ahmad RadanAbstract:In this paper a precise and simple methodology will be introduced for modeling and calculating the Voltage Source Inverter (VSI) losses in Hybrid Electric Vehicles (HEV) application. The noteworthy traction Inverter losses, consisting switching and conduction losses of diodes and IGBTs, are important for evaluating the overall Efficiency and obtaining the optimized value of its dc-link voltage as well. For this purpose, the effects of different battery voltage levels on the Inverter losses are examined.
Scott Leslie - One of the best experts on this subject based on the ideXlab platform.
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Efficiency evaluation of a 55kW soft-switching module based Inverter for high temperature hybrid electric vehicle drives application
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, 2010Co-Authors: Pengwei Sun, Alexander Litvinov, Beat Arnet, John Bates, Wensong Yu, Hao Qian, Jih-sheng Lai, Chris Smith, Scott LeslieAbstract:This paper presents a 55kW three-phase soft-switching Inverter for hybrid electric vehicle drives at high temperature conditions. Highly integrated soft-switching modules have been employed to achieve switching loss as well as conduction loss reduction. Detailed experimental evaluations of Inverter Efficiency have been conducted through both inductive load and motor-dynamometer load at coolant temperatures ranging from 25°C to 90°C. Efficiency measurement using power meter showed that the peak Efficiency is around 99%, and it drops slightly at lower speed and higher temperature conditions. To ensure measurement fidelity, a double chamber differential calorimeter system was designed and calibrated for the Inverter testing. Through long-hour testing, the measured efficiencies consistently showed 99% and higher. The soft-switching Inverter has been operated reliably and demonstrated high Efficiency at different temperature and test conditions.
Mrinal K Das - One of the best experts on this subject based on the ideXlab platform.
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performance comparison of 1200v 100a sic mosfet and 1200v 100a silicon igbt
Energy Conversion Congress and Exposition, 2013Co-Authors: Gangyao Wang, Fei Wang, Gari Magai, Yang Lei, Alex Q Huang, Mrinal K DasAbstract:This paper presents the characteristics of the first commercial 1200V 100A SiC MOSFET module and compares it with state-of-the-art silicon IGBT with the same rating. The results show that the 1200V SiC MOSFET has faster switching speed and much lower loss compared with silicon IGBT. Moreover, the silicon IGBT switching loss will increase significantly for higher operation temperature, while the SiC MOSFET switching loss is almost the same for different temperature. A loss model has been implemented in PLECs in order to simulation the losses. An 11kW singlephase Inverter prototype with 600V dc bus and 380Vac output voltage has been built for evaluating and comparing the SiC MOSFET and Si IGBT performance. The test results match with the simulation very well and show that with 40 kHz switching frequency the Inverter Efficiency can be increased to 98.5% from 96.5% if replacing the Si IGBT with the SiC MOSFET module.
Mohammad Reza Nikzad - One of the best experts on this subject based on the ideXlab platform.
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Effects of Battery Pack Voltage Level on Traction Inverter Efficiency in Parallel Hybrid Electric Vehicles
International Journal of Engineering, 2015Co-Authors: Mohammad Reza Nikzad, Ahmad RadanAbstract:In this paper a precise and simple methodology will be introduced for modeling and calculating the Voltage Source Inverter (VSI) losses in Hybrid Electric Vehicles (HEV) application. The noteworthy traction Inverter losses, consisting switching and conduction losses of diodes and IGBTs, are important for evaluating the overall Efficiency and obtaining the optimized value of its dc-link voltage as well. For this purpose, the effects of different battery voltage levels on the Inverter losses are examined.
