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. 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. 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. 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. IMPACTS ON TRANSIENT STABILITY
• Differ location of wind resources
• Various generator technologies
• Connection at lower voltage levels
• Fluctuating nature of wind power

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. 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. Circuit structure

9. Transmission model

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. Base case
• Normal operation of
system without an wind
power
• Area 1 generators highly
affected by fault
• Importing of power
from area 3

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. DFIG technology
• Half generation is
modelled with DFIG
• Reactive power flow
remains same o case 1
• Transient network
stability increses

14. 100 % DFIG
• Full generation is through DFIGs instead of SGs
• Volatage control is appliedand system not
encounters the transient stability limit

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. 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