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  • 1.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Distributed resources and re-regulated electricity markets2007Ingår i: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Vol. 77, nr 9, s. 1148-1159Artikel i tidskrift (Refereegranskat)
  • 2.
    Ackermann, Thomas
    KTH, Tidigare Institutioner                               , Elektrotekniska system.
    Distributed Resources in a Re-Regulated Market Environment2004Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    This thesis analyses the value that distributed resources(DR) can contribute to an economically effcient operation of are-regulated electricity market and discusses the relevantchanges in the regulatory framework to allow the appropriatedevelopment of DR whenever DR may increase the economiceffciency of the electricity market.

    Distributed resources thereby combine two aspects:Distributed generation and demand-side resources. Distributedgeneration is defined as generation within the distributionsystem or on the customer side of the meter. Demand-sideresources are those load resources on the customer-side thatcan be used to shift electricity demand from peak to off-peakperiods, or to reduce the overall electricity demand.

    To gain a better understanding of the value that DR mayprovide in a re-regulated market, an analysis of there-regulation approaches in England andWales, Scandinavia,Australia, New Zealand as well as in two regions in the USA isperformed. The key findings of this analysis are that non ofthe re-regulation approaches put special emphasis on DR. Thecomparison also shows that despite very different approachesused in the various markets, the remaining re-regulationproblems are very similar. These key problems are mainlyrelated to market power in the various markets and littlecompetition in network services.

    The thesis shows that DR has the potential to improveoverall economic market effciency by reducing market powerissues and increasing competition in network services. Forinstance, many DR business schemes have no incentive toexercise market power, because withholding generation may havea negative impact on the complex revenue stream from differentincome sources. While this may not allow the general conclusionthat DR will always provide benefits to market operation, it isimportant to consider that not all DR need to provide suchbenefits, as it was also shown that already comparatively smallamounts of demand resources or distributed generation cansignificantlyreduce market power issues. In addition, it wasalso shown that DR can introduce competition into networkservices and therefore can provide incentives for distributionand transmission network companies to operate more costeffectively.

    It was also demonstrated that the potential of DR to improveoverall economic market effciency will only be realized if:

    1. DR is developed in the correct size, i.e. DR should fitinto an existing distribution network and may increase networkutilization rate,2. DR is developed at the correct location in thenetwork, e.g. in areas with congestion problems,3. DR is in operation during the correct times, whenbeneficial to the market, e.g. during times when market powerissues may arise, and4. independent ownership of DR projects isencouraged.

    Market regulations therefore must provide the correctincentives for the correct siting and operation of DR as wellas for independent ownership. The thesis uses examples andempirical data to explain the relevant regulatory aspects indetail and provides suggestions for a regulatory framework thatconsiders the potential of DR to improve overall economiceffciency in an electricity market.

  • 3.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Historical Development and Current Status of Wind Power2005Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2005, 1, s. 5-24Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 4.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Historical Development and Current Status of Wind Power2012Ingår i: Wind Power in Power Systems, Second Edition, John Wiley & Sons, 2012, s. 21-24Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    The chapter provides an overview of the historical development (mechanical and electrical power generation) of wind power. It also present the current status of wind power world-wide (capacity installed) together with a discussion of the main drivers for the wind power development, e.g. feed-in tariffs, green certificates etc. Furthermore, the chapter briefly discuss the current trends in wind turbine technology, e.g. larger turbines, and projects development, e.g. offshore wind power.

  • 5.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Transmission Systems for Offshore Wind Farms2005Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2005, s. 479-503Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 6.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Wind Power in Power Systems2005Bok (Övrigt vetenskapligt)
    Abstract [en]

    As environmental concerns have focussed attention on the generation of electricity from clean and renewable sources, wind energy has become the world's fastest growing energy source. The authors draw on substantial practical experience to address the technical, economic and safety issues inherent in the exploitation of wind power in a competitive electricity market. Presenting the reader with all the relevant background information key to understanding the integration of wind power into the power systems, this leading edge text: Presents an international perspective on integrating a high penetration of wind power into the power system Offers broad coverage ranging from basic network interconnection issues to industry deregulation and future concepts for wind turbines and power systems Discusses wind turbine technology, industry standards and regulations along with power quality issues Considers future concepts to increase the penetration of wind power in power systems Presents models for simulating wind turbines in power systems Outlines current research activities Essential reading for power engineers, wind turbine designers, wind project development and wind energy consultants dealing with the integration of wind power systems into distribution and transmission networks, this text would also be of interest to network engineers working for power utility companies dealing with interconnection issues and graduate students and researchers in the field of wind power and power systems.

  • 7.
    Ackermann, Thomas
    KTH.
    Wind Power in Power Systems, Second Edition2012Samlingsverk (redaktörskap) (Refereegranskat)
    Abstract [en]

    The second edition of the highly acclaimed Wind Power in Power Systems has been thoroughly revised and expanded to reflect the latest challenges associated with increasing wind power penetration levels. Since its first release, practical experiences with high wind power penetration levels have significantly increased. This book presents an overview of the lessons learned in integrating wind power into power systems and provides an outlook of the relevant issues and solutions to allow even higher wind power penetration levels. This includes the development of standard wind turbine simulation models. This extensive update has 23 brand new chapters in cutting-edge areas including offshore wind farms and storage options, performance validation and certification for grid codes, and the provision of reactive power and voltage control from wind power plants. Key features: Offers an international perspective on integrating a high penetration of wind power into the power system, from basic network interconnection to industry deregulation; Outlines the methodology and results of European and North American large-scale grid integration studies; Extensive practical experience from wind power and power system experts and transmission systems operators in Germany, Denmark, Spain, UK, Ireland, USA, China and New Zealand; Presents various wind turbine designs from the electrical perspective and models for their simulation, and discusses industry standards and world-wide grid codes, along with power quality issues; Considers concepts to increase penetration of wind power in power systems, from wind turbine, power plant and power system redesign to smart grid and storage solutions. Carefully edited for a highly coherent structure, this work remains an essential reference for power system engineers, transmission and distribution network operator and planner, wind turbine designers, wind project developers and wind energy consultants dealing with the integration of wind power into the distribution or transmission network. Up-to-date and comprehensive, it is also useful for graduate students, researchers, regulation authorities, and policy makers who work in the area of wind power and need to understand the relevant power system integration issues.

  • 8.
    Ackermann, Thomas
    et al.
    KTH, Tidigare Institutioner.
    Andersson, G.
    Söder, Lennart
    KTH, Tidigare Institutioner.
    Distributed generation: a definition2001Ingår i: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Vol. 57, nr 3, s. 195-204Artikel i tidskrift (Refereegranskat)
  • 9.
    Ackermann, Thomas
    et al.
    KTH, Tidigare Institutioner.
    Andersson, G.
    Söder, Lennart
    KTH, Tidigare Institutioner.
    Overview of government and market driven programs for the promotion of renewable power generation2001Ingår i: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 22, nr 1-3, s. 197-204Artikel i tidskrift (Refereegranskat)
  • 10.
    Ackermann, Thomas
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Andersson, Göran
    Söder, Lennart
    KTH, Tidigare Institutioner.
    Electricity market regulations and their impact on distributed generation2000Ingår i: Electric Utility Deregulation and Restructuring and Power Technologies, 2000. Proceedings. DRPT 2000. International Conference on, 2000, s. 608-613Konferensbidrag (Refereegranskat)
    Abstract [en]

    Distributed generation (DG) has attracted a lot of attention recently and might become more important in future power generation systems. As different definitions are used worldwide, the paper briefly discusses the definition of DG. The future development of DG, however, will, to a not insignificant part, depend on the legal framework. As the legal framework can vary significantly for different competitive electricity markets, this paper briefly identifies and analyses some variations in the regulatory approaches, e.g. for power exchanges, balance services and ancillary services, in different countries. It also illustrates the influence of market regulations on the development of distributed power generation. Based on this analysis, it can be concluded that regulatory aspects might decisively influence the development of distributed power generation

  • 11.
    Ackermann, Thomas
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Centeno-Lopez, Eva
    Söder, Lennart
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Grid Issues for Electricity Production Based on Renewable Energy Sources in Spain, Portugal, Germany, and United Kingdom2008Bok (Övrigt vetenskapligt)
  • 12.
    Ackermann, Thomas
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Holttinen, H.
    Overview of Integration Studies - Methodologies and Results2012Ingår i: Wind Power in Power Systems, Second Edition, John Wiley & Sons, 2012, 2, s. 361-386Kapitel i bok, del av antologi (Refereegranskat)
  • 13.
    Ackermann, Thomas
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem. Energynautics GmbH, Germany; Technical University in Darmstadt (TUD), Germany.
    Morthorst, P. E.
    Economic Aspects of Wind Power in Power Systems2005Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2005, s. 383-410Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 14.
    Ackermann, Thomas
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Orths, A.
    Rudion, K.
    Transmission Systems for Offshore Wind Power Plants and Operation Planning Strategies for Offshore Power Systems2012Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2012, 2, s. 293-327Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    The electric system within an offshore wind power plant and its connection to the main power system pose new challenges to the experts. The best way of interconnecting the wind turbines inside a wind farm has to be found, fulfilling both, redundancy requirements without compromising economic feasibility. The best choice between technologies (HVAC, HVDC - VSC or LCC) for connecting windfarms to shore has to be made, depending on several criteria. The risk of losing this connection versus redundancy has to be economically evaluated. By combining interconnectors and offshore windfarm connections in a modular way, a DC offshore grid can be developed. Anyhow, already during the planning phase the secure operation should be considered thoroughly, because the optimal architecture has to be found, minimizing the necessary assets ensuring secure operation and facilitating later expansion options. The interaction with the onshore grid has to be investigated as well. To enable investigations covering these issues a benchmark offshore test system has been developed which is described in this chapter.

  • 15.
    Ackermann, Thomas
    et al.
    KTH, Tidigare Institutioner.
    Söder, Lennart
    KTH, Tidigare Institutioner.
    An overview of wind energy-status 20022002Ingår i: Renewable & sustainable energy reviews, ISSN 1364-0321, E-ISSN 1879-0690, Vol. 6, nr 1-2, s. 67-128Artikel, forskningsöversikt (Refereegranskat)
  • 16.
    Ackermann, Thomas
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Söder, Lennart
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    The Value of Wind Power2012Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2012, 2, s. 131-155Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    The aim of the power plants in a power system is to supply the load in an economical, reliable and environmentally acceptable way. Different power plants can fulfil these requirements in different ways. In order to select the right sources it is important to compare the value of the different sources using an objective approach. The aim of this chapter is describe the different needs of a power system and how these needs can be met with wind power, that is, the value of wind power in a certain system. The values are operating cost value, capacity value, control value, grid loss reduction value and grid investment value. The values can be calculated for different types of power plants, they can be both positive and negative, and they can be calculated both as a physical cost value and a market value.

  • 17.
    Ackermann, Thomas
    et al.
    KTH, Tidigare Institutioner.
    Söder, Lennart
    KTH, Tidigare Institutioner.
    Wind energy technology and current status: a review2000Ingår i: Renewable & sustainable energy reviews, ISSN 1364-0321, E-ISSN 1879-0690, Vol. 4, nr 4, s. 315-374Artikel, forskningsöversikt (Refereegranskat)
  • 18.
    Ackermann, Thomas
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Tröster, E.
    New Control Concept for Offshore Wind Power Plants: Constant-Speed Turbines on a Grid with Variable Frequency2012Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2012, 2, s. 345-359Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    By using a permanent magnet induction machine as wind generator, the gearbox and converter can be omitted, and the total number of parts reduced leading to a low maintenance and reliable turbine for offshore application. The rotation speed of the turbine however cannot be matched to the wind speed, reducing the energy yield at part load. To overcome this drawback, a central converter can be used, which adjusts the frequency of the local grid in the wind park; this is the so-called park-variable concept. This concept has been compared with respect to energy yield with constant speed and variable speed turbines. Overall, the differences in energy yield of the investigated concepts are so small that other criteria, such as reliability or cost, may be relevant for the selection of one or the other approach. Above all, the park-variable concept represents an interesting alternative to today's common concepts.

  • 19. Leutz, R.
    et al.
    Ackermann, Thomas
    KTH, Tidigare Institutioner                               , Energiteknik.
    Akisawa, A.
    Kashiwagi, T.
    Solar radiation for sorption cooling in Australiasia2001Ingår i: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 22, nr 1-3, s. 395-402Artikel i tidskrift (Refereegranskat)
  • 20. Liljegren, C.
    et al.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Wind Power on the Swedish Island of Gotland2005Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2005, s. 283-297Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 21. Matevosyan, J.
    et al.
    Bolik, S. M.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Technical Regulations for the Interconnection of Wind Power Plants to the Power System2012Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2012, 2, s. 209-240Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    This chapter provides a brief discussion and analysis of the current status of interconnection regulations for wind turbines and wind turbines in Europe. The chapter starts with a short overview of the relevant technical regulation issues, which includes a brief description of the relevant interconnection regulations considered in this chapter. This is followed by a detailed comparison of the different interconnection regulations. The discussion also includes the capabilities of wind turbines to comply with these requirements. Finally, issues related to international interconnection practice are briefly discussed.

  • 22.
    Matevosyan, Julija
    et al.
    KTH, Tidigare Institutioner, Elektrotekniska system.
    Ackermann, Thomas
    KTH, Tidigare Institutioner, Elektrotekniska system.
    Bolik, Sigrid
    Söder, Lennart
    KTH, Tidigare Institutioner.
    Comparison of International Regulations for Connection of Wind Turbines to the Network2004Ingår i: Proceedings of Nordic Wind Power Conference NWPC'04, 2004Konferensbidrag (Refereegranskat)
    Abstract [en]

    Power production from wind turbines hasincreased considerably during the last decade, thereforetoday’s wind turbines, which are typically set-up in windfarms, may have a significant influence on power systemoperation. Efficient and secure operation of power system issupported by grid codes, which is set of requirements to allnetwork users (generators, customers, etc.). In Europe,several transmission network operators have introducedspecial interconnection requirements for the connection ofwind farm. These requirements are mainly based on existinggrid codes, initially written for conventional synchronousgenerators. This paper presents a comparison ofinterconnection requirements for wind farms outlined bytransmission network operators in Denmark, Sweden,Germany, Scotland and Ireland.

  • 23. Morthorst, P. E.
    et al.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Economic Aspects of Wind Power in Power Systems2012Ingår i: Wind Power in Power Systems, Second Edition, John Wiley & Sons, 2012, 2, s. 489-516Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    The integration of large amounts of wind power into the energy system requires a strong interplay with power markets. In this respect the power exchange is an important instrument, defining a single market clearing price for each trading period. Following the liberalisation of the EU electricity industry power markets are increasingly being organised as power exchanges to a certain extent following the same lines, where a number of if not identical then closely related services are being provided. Using the NordPool power market as an example this chapter outlines the basic characteristics of the two key markets, the day-ahead market and the regulating market. The determination of the day-ahead price is described and the impact of wind power on power prices investigated. Finally, the cost of regulation is addressed.

  • 24. Negra, N. B.
    et al.
    Todorovic, J.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Loss evaluation of HVAC and HVDC transmission solutions for large offshore wind farms2006Ingår i: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Vol. 76, nr 11, s. 916-927Artikel i tidskrift (Refereegranskat)
  • 25. Slootweg, J. G.
    et al.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Wind Power and the Smart Grid2012Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2012, 2, s. 951-973Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    It is justified to ask why something potentially offering such benefits as Smart Grids seem to do, is not yet in place. As will be discussed in this chapter, this is due to the fact that many conditions must be fulfilled in order to really reap benefits of Smart Grids; if this is indeed the case, benefits can indeed be substantial. In order to get grip on the broad concept of Smart Grids and its interaction with wind power and its system integration, first some definitions of the Smart Grid concept will be analyzed. Thereafter, the reasons for considering Smart Grids are discussed and the question why Smart Grids presently attract so much attention whereas throughout the last century the topic was hardly known, is debated. In the next section, three different Smart Grid concepts are treated and the analysis of each of the three concepts is focused towards their relation with wind power. Finally, practical examples are discussed.

  • 26.
    Söder, Lennart
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Wind Power in Power Systems: An Introduction2005Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2005, s. 25-51Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 27.
    Söder, Lennart
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Ackermann, Thomas
    KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.
    Wind Power in Power Systems: An Introduction2012Ingår i: Wind Power in Power Systems, John Wiley & Sons, 2012, 2, s. 47-72Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    This chapter presents a comprehensive survey of the generator and power electronic concepts used by the modern wind turbine industry. A state of the art of wind turbines, from an electrical point of view, with focus on topologies and control strategies is provided. An overall perspective on both contemporary and new potentially promising wind turbine concepts, classified with respect to both their speed control ability and to their power control type is presented. A detailed investigation of the market penetration and share of different wind turbine concepts over years is also performed based on supplier's market data and concept evaluation for each individual wind turbine type sold by the Top Ten suppliers over years.

1 - 27 av 27
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