Browsing by Author "Koivisto, Matti"
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- Design and operation of energy systems with large amounts of variable generation: Final summary report, IEA Wind TCP Task 25Publication . Holttinen, Hannele; Kiviluoma, Juha; Helistö, Niina; Levy, Thomas; Menemenlis, Nickie; Jun, Liu; Cutululis, Nicolaos Antonio; Koivisto, Matti; Das, Kaushik; Orths, Antje; Eriksen, Peter Børre; Neau, Emmanuel; Bourmaud, Jean-Yves; Dobschinski, Jan; Pellinger, Christoph; von Roon, Serafin; Guminski, Andrej; Flynn, Damian; Carlini, Enrico Maria; Yasuda, Yoh; Tanabe, Ryuya; Watson, Simon; van der Meer, Arjen; Morales-España, Germán; Korpås, Magnus; Vrana, Til Kristian; Estanqueiro, Ana; Couto, António; Silva, Bernardo; Martínez, Sergio Martín; Söder, Lennart; Strbac, Goran; Pudjianto, Danny; Giannelos, Spyros; Frew, Bethany; Hodge, Bri-Mathias; Shah, Shahil; Smith, J. Charles; Lew, Debbie; O'Malley, Mark; Klonari, VasilikiABSTRACT: This report summarises findings on wind integration from the 17 countries or sponsors participating in the International Energy Agency Wind Technology Collaboration Programme (IEA Wind TCP) Task 25 from 2006–2020. Both real experience and studies are reported. Many wind integration studies incorporate solar energy, and most of the results discussed here are valid for other variable renewables in addition to wind. The national case studies address several impacts of wind power on electric power systems. In this report, they are grouped under long-term planning issues and short-term operational impacts. Long-term planning issues include grid planning and capacity adequacy. Short-term operational impacts include reliability, stability, reserves, and maximising the value of wind in operational timescales (balancing related issues). The first section presents the variability and uncertainty of power system-wide wind power, and the last section presents recent studies toward 100% shares of renewables. The appendix provides a summary of ongoing research in the national projects contributing to Task 25 for 2021–2024. The design and operation of power and energy systems is an evolving field. As ambitious targets toward net-zero carbon energy systems are announced globally, many scenarios are being made regarding how to reach these future decarbonized energy systems, most of them involving large amounts of variable renewables, mainly wind and solar energy. The secure operation of power systems is increasingly challenging, and the impacts of variable renewables, new electrification loads together with increased distribution system resources will lead to somewhat different challenges for different systems. Tools and methods to study future power and energy systems also need to evolve, and both short term operational aspects (such as power system stability) and long-term aspects (such as resource adequacy) will probably see new paradigms of operation and design. The experience of operating and planning systems with large amounts of variable generation is accumulating, and research to tackle the challenges of inverter-based, nonsynchronous generation is on the way. Energy transition and digitalization also bring new flexibility opportunities, both short and long term.
- Flexibility chart 2.0: An accessible visual tool to evaluate flexibility resources in power systemsPublication . Yasuda, Yoh; Carlini, Enrico Maria; Estanqueiro, Ana; Eriksen, Peter Børre; Flynn, Damian; Herre, Lars Finn; Hodge, Bri-Mathias; Holttinen, Hannele; Koivisto, Matti; Gómez-Lázaro, E.; Martínez, Sergio Martín; Menemenlis, Nickie; Morales-España, Germán; Pellinger, Christoph; Ramos, Andrés; Smith, Charlie; Vrana, Til KristianABSTRACT: Various aspects of power system flexibility are evaluated within the multi-country study framework of IEA Wind Task 25. Grid components and actions which have been adopted for enhancing flexibility in different areas, countries, regions are addressed, as well as how Transmission System Operators, Independent System Operators, Utilities intend to manage variable generation in their operating strategies. A visual assessment to evaluate the diversity of flexibility sources, called a “flexibility chart”, is further developed to illustrate several flexibility parameters (e.g., hydropower, pumped hydro, gas turbine, combined heat and power, interconnection and battery) in a polygonal radar (fan-shaped) chart. This enhanced version of the Flexibility Chart is an “at-a-glance” and “easy-to-understand” tool to show how to estimate the potential of flexibility resources in a given country or area, and is accessible for non-technical experts. The Flexibility Chart 2.0 is also a useful tool to compare the past and future flexibility of a system. Comparing the historical change of flexibility resources may not only be helpful to discuss energy policy in regions with high installed variable renewable generation, but also to contribute to the discussion in other regions where renewables have not been widely adopted yet.
- Improving wind power market value with various aspects of diversificationPublication . Vrana, Til Kristian; Svendsen, Harald G.; Korpås, Magnus; Couto, António; Estanqueiro, Ana; Flynn, Damian; Holttinen, Hannele; Härtel, Philipp; Koivisto, Matti; Lantz, Eric; Frew, BethanyABSTRACT: The wind generation share in many European bidding zones is now large enough to affect the market value of wind power, and wind energy is getting less-than-average market price in day-ahead markets. As alternatives to investing in dedicated energy storage, there are two main ways to mitigate the decreasing market value trend. The first is employing different diversification measures (geographical spread, alternative wind turbine technologies, integration with solar). The second is implementing demand flexibility measures. Examples of these measures from some European and USA studies are given in this article, which stems from the international collaboration under IEA Wind TCP Tasks 25 and 53.