Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Wind power need not be backed up by an equal amount of reserve power

04.12.2007
International evaluation indicates:
ind power need not be backed up by an equal amount of reserve power

The production of wind power varies and is harder to forecast than the fluctuations in electricity demand. Adding large quantities of wind power to power systems is therefore challenging. The power system impacts of wind power were studied in international collaboration coordinated by VTT Technical Research Centre of Finland. The results indicate that the frequently stated claim of wind power requiring an equal amount of reserve power for back-up is not correct. A substantial adjustment tolerance is already built in to our power network, and the impacts of wind power fluctuations can be further balanced through a variety of measures.

The collaboration within the International Energy Agency (IEA) Implementing Agreement for Wind Energy, coordinated by VTT, has resulted in the publication of the first state-of-the-art report assessing the international experience gained on the system impacts of wind power.

The impact of a large share of wind power can be controlled by appropriate grid connection requirements, extension and enforcement of transmission networks as well as integration of wind power production and production forecasts into system and market operation. The state-of-the-art report presents the assessments of the impact of wind power on the reliability and costs of the power system conducted in different countries.

The assessments performed in different countries are often based on substantially different assumptions. Comparison of the studies showed that in particular the assumptions concerning the use of international transmission connections and the time scale of updating wind power forecasts had a major impact on the results.

The aggregation benefits of a power system covering a large area help in reducing wind power fluctuations and improve predictability. A large power system also has a larger amount of generation reserves available, and the increased regulation effort can be implemented cost-effectively. The transmission capacity between areas is crucial for the utilisation of the benefits arising from large production areas. An electricity market in which production forecasts can be updated a few hours ahead also helps in keeping down the forecast errors and thereby the costs of balance power.

The report contains a summary of the wind power impact assessments performed in 11 countries. The assessments are divided into three categories:
1. Additional costs arising from the balancing of wind power fluctuations
2. Grid reinforcement needs due to wind power
3. Capacity of wind power to replace other power plant capacity
With wind power penetrations amounting to 10–20% of the gross electricity demand, the additional costs (per MWh of wind power) arising from the balancing of wind power fluctuations are estimated to range between1–4 €/MWh. This is less than 10% of the long-term market value of electricity.

Current wind power technology makes it possible for wind power plants to support the grid in the event of faults such as significant voltage drops and to participate in voltage regulation. Wind power plants are also able to limit their production fluctuations. The grid reinforcement needs due to wind power vary in different countries depending on how far from the consumption centres the wind power plants are constructed and how strong the existing national grid is.

Even though wind power is mainly an energy resource that replaces fossil power generation, it can also be used for replacing existing power plant capacity. In areas where wind power production is high during peak demand, wind power can replace other capacity by up to 40% of the installed wind power capacity. However, when a larger share, more than 30%, of electricity is produced by wind power and in areas where the wind power production is low during peak demand, wind power can only replace other capacity by 5–10% of the wind power capacity.

Publication: Design and operation of power systems with large amounts of wind power. State-of-the-art report:
http://www.vtt.fi/inf/pdf/workingpapers/2007/W82.pdf
http://www.vtt.fi/vtt_show_record.jsp?target=julk&form=sdefe&search=58120

Hannele Holttinen | alfa
Further information:
http://www.vtt.fi
http://www.vtt.fi/inf/pdf/workingpapers/2007/W82.pdf
http://www.vtt.fi/vtt_show_record.jsp?target=julk&form=sdefe&search=58120

More articles from Power and Electrical Engineering:

nachricht Did you know that the wrapping of Easter eggs benefits from specialty light sources?
13.04.2017 | Heraeus Noblelight GmbH

nachricht To e-, or not to e-, the question for the exotic 'Si-III' phase of silicon
05.04.2017 | Carnegie Institution for Science

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>