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Dr.-Ing. Kurt Rohrig

Extra Large Scale Virtual Power Plants – New Concepts to Integrate German Wind Potential into Electrical Energy Supply. EWEC 2006, Athens Business, Science & Technology. Introduction Wind power integration in Germany Wind Farm Cluster Management XLS Virtual Power Plants.

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Dr.-Ing. Kurt Rohrig

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  1. Extra Large Scale Virtual Power Plants – New Concepts to Integrate German Wind Potential into Electrical Energy Supply EWEC 2006, Athens Business, Science & Technology Introduction Wind power integration in Germany Wind Farm Cluster Management XLS Virtual Power Plants Dr.-Ing. Kurt Rohrig Institut für Solare Energieversorgungstechnik Verein an der Universität Kassel e. V. www.iset.uni-kassel.de

  2. Introduction Wind Energy in Germany 18300 MW 17400 WT as of 12/2005 wind generation 25,9 TWh in 2004 26,3 TWh in 2005

  3. Introduction yesterday: konv. generation = load • Typical load profile in Germany 1.-7. May

  4. Introduction today: konv. generation = load – wind generation • Load profile & wind generation today

  5. Wind Power Integration in Germany Forecast for the current wind power feed-in Step 1: Online model calculates from few measured windfarms the current power for all plants Step 2: Prediction model calculates on the basis of the current power of all plants and the weather forecast the future wind power feed-in Accuracy in the statistical averageover 95 % for the D+1 forecastover 96 % for the 4 hours forecast Applications: E.ON-NetzVattenfall Europe TransmissionRWE Transportnetz Strom EnBW Transportnetze

  6. Wind Power Integration in Germany • Wind Power Measurement Network • Measurements at representative • wind farms (substations) • E.ON: 69sites2356 MW (33,2 %) • VE-T: 17sites725 MW (11,4 %) • RWE:16sites 461 MW (15,2 %) • EnBW: 7 sites 108 MW (41,3 %) • Total: 111 sites 3650 MW (21,8 %)

  7. Wind Power Integration in Germany • Wind generation– online, day-ahead forecast

  8. Wind Power Integration in Germany • Wind generation– online, 4 hour forecast

  9. Wind Power Integration in Germany Horizontal exchange of wind power generation

  10. Wind Power Integration in Germany I/Ro 1/2002

  11. Wind Power Integration in Germany today: konv. generation = load – wind generation • Load profile & wind generation today

  12. Wind Power Integration in Germany Considering planned installations offshore further growth up to 40 GW is expected

  13. Peak Load contribution Traditional CHP 60 % Hydro Wind Bio fuel Photovoltaic MAX How to handle the surplus? Source SIEMENS Wind Power Integration in Germany EC- Targets 2010 - generation 40 % Pump storage generation P, % 100 75 Average renewable & CHP generation Pump load 50 25 Traditional generation 6 12 18 24 -25

  14. Wind Power Integration in Germany tomorrow: konv. generation = load – wind generation = 0 !! • Load profile & wind generation 2015

  15. Wind Farm Cluster Management The intermittent generation in range of several (tenth) GW has increasing influence on two important areas of TSOs tasks: grid management frequency control and requires new concepts and strategies for management and control of WTs, wind farms and wind farm clusters

  16. Wind Farm Cluster Management • Cluster Management • Aggregation of large on- and offshore wind farms allows innovative control strategies • Functions: • Consideration of data from online acquisition and prediction • Aggregation and distribution of predicted power generation to different clusters (scheduling) • Consideration of network restrictions arising from network topology • Consideration of restrictions arising from power plant scheduling and electricity trading • Scaling of threshold values • Allocation of target values to different clusters

  17. Wind Farm Cluster Management equivalent circuit diagram

  18. Wind Farm Cluster Management • reactive power provision • default maximum active power feed • schedule setting • voltage control on high/extra-high voltage level • control power provision • ability for primary control • Wind farm control with 11 Enercon E 66

  19. Wind Farm Cluster Management • Reserve power supply (500 MW)

  20. Wind Farm Cluster Management Index

  21. Wind Farm Cluster Management • Cluster-Management

  22. XLS Virtual Power Plants • Future Scenarios • wind power generation in 10th GW range effects prediction errors in GW range • large wind power fluctuations cannot be compensated only by control power • interventions (control strategies) of WTs are limited • Extra Large Scale Virtual Power Plants • pooling of wind, CHP, storage devices and special conventional power plants • to generation clusters • fast and precise adjustment with modern ICT and innovative generation • management • continental energy exchange with consideration of RE generation of • all partners • Control Centre 2010 • active integration of generation pools into grid management • active contribution of next generation WTs to system reliability

  23. XLS Virtual Power Plants Make intermittend wind power generation compilant to electrical supply system and minimize the need of reserve and control power

  24. XLS Virtual Power Plants

  25. XLS Virtual Power Plants Generation-Pooling by extra large virtual power Plants with consideration of grid security and supply reliability

  26. XLS Virtual Power Plants Control Centre 2010

  27. Contact: k.rohrig@iset.uni-kassel.de

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