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Short Term Hydro Power Planning Coordinated with Wind Power in Areas with Congestion Problems
KTH, School of Electrical Engineering (EES), Electric Power Systems.
KTH, School of Electrical Engineering (EES), Electric Power Systems.ORCID iD: 0000-0002-8189-2420
2007 (English)In: Wind Energy, ISSN 1095-4244, E-ISSN 1099-1824, Vol. 10, no 3, 195-208 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, a day-ahead planning algorithm for a multi-reservoir hydropower system coordinated with wind power is developed Coordination applies to real situations, where wind power and hydropower are owned by different utilities, sharing the same transmission lines, although hydropower has priority for transmission capacity. Coordination is thus necessary to minimize wind energy curtailments during congestion situations. The planning algorithm accounts for the uncertainty of wind power forecast. Only planning for the spot market is considered. Once the production bid is placed on the market, it cannot be changed. The solution of the stochastic optimization problem should, therefore, fulfill the transmission constraints for all wind power production scenarios. An evaluation algorithm is also developed to quantify the impact from the coordinated planning in the long run. The developed planning algorithm and the evaluation algorithm are applied in a case study. The results are compared with uncoordinated operation. The results of the case study show that coordination with wind power brings additional income to the hydropower utility and leads to significant reduction of wind energy curtailments.

Place, publisher, year, edition, pages
2007. Vol. 10, no 3, 195-208 p.
Keyword [en]
wind power production; hydropower production; wind forecast uncertainty; power market; stochastic optimization; SCENARIO REDUCTION; SYSTEM; OPERATION; MARKET
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6136DOI: 10.1002/we.216ISI: 000247219600001Scopus ID: 2-s2.0-34250767737OAI: oai:DiVA.org:kth-6136DiVA: diva2:10762
Note
QC 20100608Available from: 2006-09-20 Created: 2006-09-20 Last updated: 2011-10-18Bibliographically approved
In thesis
1. Wind Power Integration in Power Systems with Transmission Bottlenecks
Open this publication in new window or tab >>Wind Power Integration in Power Systems with Transmission Bottlenecks
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

During the last two decades, the increase in electricity demand and environmental concern resulted in fast growth of power production from renewable sources. Wind power is one of the most efficient alternatives. Due to the rapid development of wind turbine technology and increasing size of wind farms, wind power plays a significant part in the power production mix of Germany, Spain, Denmark, and some other countries.

The best conditions for the development of wind farms are in remote, open areas with low population density. The transmission system in such areas might not be dimensioned to accommodate additional large-scale power infeed. Furthermore a part of the existing transmission capacity might already be reserved for conventional power plants situated in the same area.

In this thesis four alternatives for large-scale wind power integration in areas with transmission bottlenecks are considered. The first possibility is to revise the methods for calculation of available transmission capacity. The second solution for large-scale integration of wind power in such areas is to reinforce the network. This alternative, however, may be expensive and time consuming. As wind power production depends on the wind speed, the full load hours of wind turbine generator are only 2000-4000 hours per year. Therefore reinforcing a transmission network in order to remove a bottleneck completely is often not economically justified. Wind energy curtailments during congestion situations is then the third solution for large-scale wind power integration with less or no grid reinforcement. The fourth solution is to store excess wind energy. Pumped hydro storage or battery storage for the large-scale wind farms are still rather expensive options, but existing conventional power plants with fast production control capabilities and sufficient storage capacity, e.g., hydro power plants, could be used for this purpose.

As there is a lot of research work on the first two alternatives, the thesis provides a review and summarizes the main conclusions from the existing work. The thesis is then directed towards the development of the methods for estimation of wind energy curtailments, evaluation of wind energy storage possibility in hydro reservoirs and development of short term hydro power production planning methods, considering coordination with wind power.

Additionally in the thesis the strategy that minimizes imbalance costs of a wind power utility, trading wind power on the short term power market is elaborated and analyzed.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006
Series
Trita-ETS, ISSN 1650-674X ; 2006:041
Keyword
wind power, hydro power, transmission bottlenecks, stochastic optimization
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-4108 (URN)91-7178-445-4 (ISBN)
Public defence
2006-10-03, V2, Teknikringen 76, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100608Available from: 2006-09-20 Created: 2006-09-20 Last updated: 2010-06-08Bibliographically approved

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