| 1. |
- Ahlgren, Erik, 1962, et al.
(författare)
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Produktionsrelaterade systemstudier
- 2006
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- I denna rapport, Produktionsrelaterade systemstudier – flexibla el- och värmesystem, har kortfattat ett antal områden som kan tänkas få betydelse för utvecklingen av de svenska el- och värmeförsörjningssystemen analyserats. Målet har varit att ge en bakgrundsbeskrivning av ett antal tekniska och teknisk-ekonomiska områden som kommer att påverkas av och/eller påverka framtida el- och värmeförsörjning. Författarna har utgått från de övergripande frågorna, såsom försörjningstrygghet i en avreglerad marknad och energisektorns miljöpåverkan speciellt med avseende på klimatpåverkan. Systemgränsen runt el- och värmesektorn har avsiktligt dragits mycket brett så att också bebyggelse- och industrisektorerna är inkluderade, eftersom dessa är de klart dominerande sektorerna både med avseende på elanvändning och med total energianvändning. Avsikten med detta har varit att peka på den stora betydelse som ändrade energiefterfrågemönster inom bebyggelsesektorn och än annan syn på industrisektorn, inte bara som energianvändare utan också delvis som energileverantör, kan få för det framtida el- och värmeförsörjningssystemet. Studien behandlar produktionsrelaterade elsystemfrågor, men med ett perspektiv av interaktion mellan tillgång och efterfrågan. Ett stort antal tillförseltekniker och –system har kort berörts. Vissa av dessa dominerar systemet idag, andra kan tänkas få en inte oväsentlig betydelse i framtida system. Genomgående trycks på behovet av en integrerad analys där hänsyn tas till samspel mellan tillförsel och användning, mellan teknik och ekonomi, mellan kort och lång sikt, mellan el och värme och även transporter, för att uppnå en högre verkningsgrad och därmed minskad miljöbelastning. Verkningsgraden har betraktats utgående från ett systemperspektiv snarare än från ett anläggnings-perspektiv. Slutsatsen av analysen är att det fortfarande finns ett antal markanta kunskapsluckor, och att dessa framför allt finns på systemnivå i samspelet, eller det möjliga samspelet, mellan ovan nämnda områden; tillförsel och användning; el, värme och transporter; samt betydelsen för försörjningssystemet av förväntade ändringar med tiden av såväl el- och värmeefterfrågan, som av tillgängliga tekniska lösningar.
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| 2. |
- Carlson, Ola, 1955, et al.
(författare)
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Integration of Wind Power by DC-Power Systems
- 2005
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The world climate changing is driving the electric power production towards renewable energy sources. The development of wind turbines has reached the power level of 5 MW and wind farms up to 1000 MW are planned. Investigations have shown that the cost for production of wind energy is in the same level as coal and gas. The large amount of hydro power in the Nordic countries can be used tocompensate for the irregularity of producing wind power in Europe. High voltage direct current connections between Sweden and Germany, with a wind farm between can be a solution in the future.
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| 3. |
- Carlson, Ola, 1955, et al.
(författare)
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Power System Voltage Stability Related to Wind Power Generation
- 2006
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Ingår i: 2006 European Wind Energy Conference and Exhibition, Athens, Greece.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- As is well known the amount of installed wind power increases every day. In the past single wind turbines were installed separately, today wind turbines often are connected to the grid as a group of many turbines, i.e. wind parks. Grid integration considerations have moved from flicker phenomena in the low voltage grid to voltage stability analyses in the transmission grid. This paper starts with an overview of the voltage stability phenomena in a transmission system. Suitable models of wind power generation for power system stability studies - both long and short-term stability - are presented. Different levels of detail of the wind generation models are investigated carefully considering the type of stability study, result accuracy and simulation efficiency. Important aspects such as protection, fault ride-through capability and the capability of producing reactive power are taken into account. The models are then validated against measurements.Three types of wind turbines are considered in this study; fixed speed with induction generator, variable speed operation with doubly fed induction generator and variable speed turbine with full power converter.The main phenomenon that determines the behaviour of a system where fixed speed wind turbines are connected is the large reactive power consumed by the induction machines immediately after the fault has been cleared. This mechanism leads to a voltage stability problem with a risk of voltage collapse as a final consequence. Investigations in short and long term voltage stability have examined the factors affecting the stability limit such as: generated power, fault types, fault duration, fault clearing time, fault voltage and remaining voltage. Variable speed wind turbines with power electronic converter are capable of producing active power at unity power factor. Possibility lies to control reactive power during grid disturbance with the help of an over-rated grid side converter. In this paper the long- and short-term voltage stability aspects of variable speed wind turbines with power electronic converters are illustrated by case studies. Large scale wind power integration at the transmission level has the possibility to improve long term voltage stability of the grid by injecting reactive power. The possibility to produce reactive power increases with a decreased active power production. As well small scale integration at the distribution level can increase short-term voltage stability of the local grid by utilizing its fast reactive power control capability.Finally, several issues related to the modelling and the compatibility of wind power generation in typical power system simulation tools is discussed.
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| 4. |
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| 5. |
- Ellsen, Magnus, 1961, et al.
(författare)
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Drift, utveckling och dokumentation vid Chalmers provstation för vindenergiforskning
- 2009
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The objective of the project is to carry out research, maintain and run the Wind Turbine at the Hönö test station. Another objective of the project is to make documentation and measurements available on the web. The station is used in research projects as well as a demonstration and a lab facility. The turbine is equipped with a permanent magnet direct driven generator and an electrical system with a DC link suited for variable speed operation. Research is focused mainly on the generator and its electrical system. In this study the generator electrical system has been rebuilt for series compensation. An investigation of series compensation of the PM generator has been made in an earlier study. (”Drift av Hönö provstation – HÖNÖ”, Chalmers, December 2006) That earlier study showed that the use of capacitors in series with the generator windings in comparison to parallel capacitors could increase the power output from the generator by 60%. Measurements made on the rebuilt electrical system confirm this. Several study visits and an Open House are arranged annually. The test station is financed by Göteborg Energi. The report is made within the project ”Drift, utveckling och dokumentation vid Chalmers provstation för vindenergiforskning”.
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| 6. |
- Ellsen, Magnus, 1961, et al.
(författare)
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Series and Parallel Compensation for the Permanent Magnet Synchronous Generator at Chalmers Test Wind Turbine
- 2006
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Ingår i: NORDIC WIND POWER ONFERENCE, 22-23 MAY 2006, ESPOO, FINLAND. ; , s. 10-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The objective of the work at Chalmers test station is to carry out research, maintain and run the wind turbine at the plant. The station is used for research projects and as a demonstration and lab facility. The turbine is equipped with a permanent magnet direct-driven generator and an electrical system with a DC link suited for variable speed operation. Research focuses mainly on the generator and its electrical system. Series compensation of the PM generator is investigated. Theoretical studies show that the use of capacitors in series with generator windings in comparison to the present parallel capacitors can increase power output from the generator at a certain design speed interval. Both theoretical calculations and practical tests show that an increase in power by 60 % is possible.
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| 7. |
- Ellsen, Magnus, 1961, et al.
(författare)
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Teknisk slutrapport i projektet Drift av Hönö provstation - HÖNÖ
- 2006
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The objective of the project is to carry out research, maintain and run the Wind Turbine at the Hönö test station. The station is used in research projects as well as a demonstration and a lab facility. The turbine is equipped with a permanent magnet direct driven generator and an electrical system with a DC link suited for variable speed operation. Research is focused mainly on the generator and its electrical system. An investigation of series compensation of the PM generator has been made. Theoretical studies have shown that the use of capacitors in series with the generator windings in comparison to the present parallel capacitors could increase the power output from the generator. Both theoretical calculations and practical tests show that an increase of the power by 60 % is possible. Several study visits and an Open House are arranged annually. The test station is financed by the Swedish Energy Board and Göteborg Energi. The report is made within the project 'Drift av Hönö provstation - HÖNÖ'. The report describes research and other activities at the test station from the project start 1 July, 2002 until the project end in 30 July, 2005.
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| 8. |
- Martins, Marcia, 1966, et al.
(författare)
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Validation of fixed speed wind turbine dynamic models with measured data
- 2007
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Ingår i: Renewable Energy. - : Elsevier BV. - 0960-1481 .- 1879-0682. ; 32:8, s. 1301-1316
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Tidskriftsartikel (refereegranskat)abstract
- Power system dynamics studies involving fixed-speed wind turbines normally use a wind turbine model consisting of two lumped masses, an elastic coupling and a induction generator model which neglects stator transients. However, validations of this model with measured data are rarely reported in the literature. This paper validates the model using a recorded case obtained in a fixed speed, stall regulated 180 kW wind turbine through a voltage dip. The work analyses the performance of the reduced order induction generator model which neglects stator transients, compared to the detailed induction generator model. It also includes a study of the convenience of representing mechanical damping in the drive train, and an evaluation of the single mass mechanical model.
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| 9. |
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| 10. |
- Nguyen, Anh, et al.
(författare)
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Wind Power in Power Markets: Opportunities and Challenges
- 2007
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Ingår i: Nordic Wind Power Conference, 1-2 November 2007, Roskilde, Denmark.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper provides a comprehensive review of the opportunities and challenges from trading of wind power in power markets. The opportunities are the low operating costs, government incentive/subsidy program, reduction of market price, reduction of carbon dioxide emission, reduction of network loss, etc. The challenges would be technical requirement for power system integration, high investment cost, increased requirement on regulation power due to wind forecast error, more price volatile, more market competition for other generations, etc. The opportunities and challenges are discussed from different market players’ perspectives. Some suggestions for possible measures to overcome those challenges are presented.
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