Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Presentation

  • Login to see the comments

Presentation

  1. 1. A Presentation on Impacts of Large Scale Wind Plants On Power System Transient Stability Academic Session 2012-13 Guided By:- Submitted by:- Mrs.Nikita Jhanjariya Arvind Siddh Associate Professor M.Tech- Ist sem. power system Malviya National Institute Of Technology
  2. 2. CONTENTS • Objective • Issues for wind plant studies • Impacts on stability • Wind mill modelling • DFIG Technology & aggregated wind farms • Transmission model for analysis • Transient stability analysis • Conclusion • Vote of thanks
  3. 3. OBJECTIVE • To study about various issues and impacts of wind plants on power system stability • Analysis about various generator technologies • Transmission model and it”s analysis for transient stability phenomena
  4. 4. ISSUES FOR WIND PLANT STUDIES • Fluctuating nature of windpower • Location of wind resources • Various generator technologies generator control • Superposition of various wind power aspects • Predict required network reinforcements • Additional reserve requirements • The impact on power system stability
  5. 5. IMPACTS ON TRANSIENT STABILITY • Differ location of wind resources • Various generator technologies • Connection at lower voltage levels • Fluctuating nature of wind power
  6. 6. Wind mill modelling • Wind turbines constitutes of various technologies • a) fixed speed induction generator • b) variable speed induction generator(DFIG technology) • c) Aggregated wind farm technique
  7. 7. DFIG Technology • DFIGs are variable speed wind turbines • Hence they provide a constant frequency electrical output for varying wind speeds • This is accomplished by power electronics
  8. 8. Circuit structure
  9. 9. Transmission model
  10. 10. Transient stability analysis Cases for analysis • a) base case • b) changed location of generation • c) DFIG technology • d) 100 % DFIG • e) Infeed at lower voltage level
  11. 11. Base case • Normal operation of system without an wind power • Area 1 generators highly affected by fault • Importing of power from area 3
  12. 12. Changed location of generation • Adding of extra generator to area 1 • Now area 1 exports the electrical power • Rotar angle difference increases • System closer to stability limit
  13. 13. DFIG technology • Half generation is modelled with DFIG • Reactive power flow remains same o case 1 • Transient network stability increses
  14. 14. 100 % DFIG • Full generation is through DFIGs instead of SGs • Volatage control is appliedand system not encounters the transient stability limit
  15. 15. Infeed at lower voltage level • Wind generation is connected to sub-transmission level • Reactive power contribution is lowered • Critical fault clearing time is reduced
  16. 16. Conclusion • The location of wind generators can have a very large im-pact on transient stability. • DFIG improves the transient stability margins • Integration to subtransmission distribution system have negetive impact on transient stability

×