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| 2. |
- Babaei, Saman, et al.
(författare)
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Effects of PHEVs in power distribution systems: reviews and analyses
- 2010
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Ingår i: CIRED Workshop on Sustainable Distribution Asset Management and Financing, 7-8 June 2010, Lyon, France.
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Konferensbidrag (refereegranskat)abstract
- This paper deals with the analysis of the impacts of plug-in hybrid electric vehicles (PHEVs) on the power system, with focus on the low voltage power distribution system. First a review of the technical challenges in the power system due to the mass introduction of PHEVs in the transportation sector is given. Then the paper shows on an analysis of the overloading effects of PHEVs on the distribution system with normal charging and quick charging of PHEVs for an IEEE 13-node distribution test system using power flow analysis. The results of the study show that introduction of PHEVs in the transportation sector will lead to overloading of distribution system and cause voltage problems at the end-users. The paper also analyzes the effects of PHEVs in the transmission system, using the Nordic 32-bus test system. The study results showed that the overloading problem is not prominent. However, one interesting and important result is that PHEVs may lead to overvoltages in some buses in the transmission system which requires the voltage control measures. PHEVs would also lead to increased number of network violations in the contingency analysis.
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| 3. |
- Babaei, Saman, et al.
(författare)
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Effects of Plug-in Electric Vehicles on Distribution Systems: The Real Case of Gothenburg
- 2010
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Ingår i: IEEE PES Conference on Innovative Smart Grid Technologies Europe, Gothenburg, Sweden, October 10-13, 2010. - 9781424485109
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Konferensbidrag (refereegranskat)abstract
- The electric power system is changing and, especially, the electrical distribution system will meet new features. One of the large changes is a transformation of the transportation sector with the use of electricity, with introduction of electrical vehicles and Plug-in Electric Vehicles (PEVs). This will pose new challenges and opportunities for the electric distribution companies. This paper analyzes the effects of PEVs charging on the local 400 V and 10 kV electric distribution systems in the city of Gothenburg, Sweden, using steady-state power flow analysis. Two different areas representing residential area and commercial area have been simulated for the worst-case scenario, which is simultaneous charging of all the vehicles during the peak load period. The number of PEVs used has been estimated based on the load level at each customer location. The study results have shown that overloading of lines would occur when simultaneous charging of the vehicles during the peak load period. There would, however, be no problem with the voltage drop at the customer’s location during PEVs charging. An iterative method is proposed to estimate the maximum number of possible vehicles charging in the distribution system without resulting in any line overloaded. This method is also applied when one of the feeders is on outage to ensure the N-1 reliability criterion.
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| 4. |
- Bertling, Lina, 1973, et al.
(författare)
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Integration of plug in hybrid electric vehicles and electric vehicles - Experience from Sweden
- 2010
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Ingår i: Power and Energy Society General Meeting, 2010 IEEE. - 9781424483570
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Integration of plug in hybrid electric vehicles and electric vehicles (PHEVs and EVs) includes a wide area of topics like grid effects, different charging concepts, charger designs, harmonics from the charger etc. This short paper gives an introduction to ongoing work within this field in Sweden, and shows on research work within the topic at Chalmers University of Technology. ©2010 IEEE.
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| 5. |
- Carlson, Ola, 1955, et al.
(författare)
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Development and Demonstration of New Technology for the use of Wind Turbines on Ships
- 2014
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Technology to substantially reduce commercial ship fuel consumption by harnessing sea winds forsimultaneous generation of electricity and thrust, has been developed by the company PROPit AB.The basic idea is to apply conventional wind turbine technology for the marine environment, wherethe turbine will also take the function of sails. Primary target market is tankers or bulk ships with alarge and open deck space. Chalmers, in a study co-sponsored by the Swedish Energy Agency andChalmers Energy Centre, 2011, confirmed fuel saving estimates around 15-30 % for optimal routes,but with higher uncertainties.
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| 6. |
- Carlson, Ola, 1955, et al.
(författare)
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Harnessing energy flows: technologies for renewable power production
- 2014
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Ingår i: Systems Perspectives on Renewable Power 2014. - 9789198097405 ; , s. 32-45
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- In this chapter, the technologies for renewable power production of today andin the near future will be described and explained. Renewable power productionis electric power production without using a fuel that will end some day in thefuture. In this chapter, as in this book, power production based on renewable fuels(biomass) is excluded1.Some of the technologies such as wind or solar has reached industry massproduction in recent years, hydro power has been in operation more than 100years and others like wave or ocean current power have still some development todo before robust power production units are available.
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| 7. |
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| 8. |
- Cutululis, Nicolaos Antonio, et al.
(författare)
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Challenges Towards the Deployment of Offshore Grids: the OffshoreDC Project
- 2014
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Ingår i: 13th International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Plants, Berlin, Germany, 11-13 Nov. 2014. - 9783981387094
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Konferensbidrag (refereegranskat)abstract
- This paper summarizes challenges towards the deployment of offshore grids which are dealt with in the Nordic OffshoreDC project. The OffshoreDC project studies the techno-economic challenges related to assessment of the value and use of optimization in the design of offshore grids. The project also studies the technical challenges related to control, protection and provision of ancillary services from HVDC grids with connected wind power plants. Finally, the transients in the DC grids are studied in the project.
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| 9. |
- Espinoza, Nicolas, 1984, et al.
(författare)
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Grid code testing of full power converter based wind turbines using back-to-back voltage source converter system
- 2013
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Ingår i: EWEA Annual Event 2013 conference proceedings.
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Konferensbidrag (refereegranskat)abstract
- This paper presents an alternative approach of grid code testing for wind turbines (WTs) using back-to-back Voltage Source Converter (VSC). In particular, this paper focuses on grid code analysis for WTs, and low voltage ride through (LVRT) testing for full power converter (FPC) based WTs. Recent European grid codes are analyzed and selected for testing according to their strictness and wind power penetration in each country. The investigated testing setup consists of a 4 MW FPC-based WT and an 8 MW back-to-back VSC system, operated as a test equipment. The effectiveness of the investigated grid code testing method is validated using the simulation tool PSCAD/EMTDC, where the electrical systems of the WT as well as the test equipment are modeled in detail. A control strategy for the WT is given; in addition, hardware and control algorithms for the converter-based test equipment are described, with special focus on their limitations for testing procedures. The results demonstrate the capability of the investigated testing device in producing a controllable voltage dip at the terminals of the WT, at the same time that is being fed with short circuit currents. Moreover, its flexibility in emulating the behavior of the grid in continuous and dynamic condition is highlighted and discussed in extent.
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| 10. |
- Haghbin, Saeid, 1977, et al.
(författare)
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A Combined Motor/Drive/Battery Charger Based on a Split-Windings PMSM
- 2011
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Ingår i: 7th IEEE Vehicle Power and Propulsion Conference, VPPC 2011, Chicago, 6-9 September 2011. - 9781612842486
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Konferensbidrag (refereegranskat)abstract
- An integrated motor/drive/battery charger is proposed, designed and simulated for vehicles using grid power to charge the system batteries. The machine stator windings are re-configured by a relay-based switching device for charging to constitute a special grid connected generator. This rotary generator (machine with re-configured windings) provides an isolated three-phase power source for the inverter to make a three-phase boost battery charger. The system design and operation in the charging and traction modes are explained for the proposed integrated motor/drive/battery charger. The charging power is half of the traction power for the proposed system. Simulation results are provided to verify the proper operation for the proposed system.
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