DYNAMIC PREFORMANCE IMPROVEMENT OF WIND FARMS USING DFIG

1. A
Presentation on
Dynamic Performance Improvement of Wind Farms using
DFIG
Rajkiya Engineering College
Department of Electrical Engineering
Ambedkar Nagar U.P.-224122
Under the guidance of: Presented By:
Ms. Shashi Pandey Ajeeta Srivastava (1473720005)
Akansha (1473720006)

2. CONTENTS
• Introduction
• Objective of project
• Role of power electronics in wind energy till date
• Actual and targeted installed wind capacity actual and targeted installed wind capacity
• State wise wind energy scenario
• Doubly fed induction generator (DFIG)
• Challenges faced by wind energy sector
• Work to be carried out

3. INTRODUCTION
• Renewable energies are sources of clean, inexhaustible and increasingly
competitive energy.
• Among various renewable resources such as sunlight, wind, rain, tides, waves,
geothermal heat; wind is considered to be the cheapest and major renewable
source.
• The Indian wind industry is nearly thirty years old, and now holds the 4th
position in terms of wind power generation capacity.
• As of the end of march 2017 the total installed wind power capacity of India
was 32.17 GW.

4. Objective of project
• To achieve highly efficient performance and improvement of power
quality by using variable speed wind generator in combination with
advanced power electronic converter.
• The dynamic performance improvement of wind farm with Doubly
Fed Induction Generator.

5. Role of power electronics in wind energy till date
• In the 1980s, the power electronics for wind turbines was just a soft starter used to
initially interconnect the squirrel-cage induction generator with the power grid, and only
simple thyristors were applied and they did not need to carry the power continuously.
• In the 1990s the power electronic technology was mainly used for the rotor resistance
control of wound-rotor induction generator, where more advanced diode bridges with a
chopper were used to control the rotor resistance for generator, especially at nominal
power operation to reduce mechanical stress and loading.
• Since 2000, even more advanced back-to-back (BTB) power converters were introduced
in large scale which started to regulate the generated power from the wind turbines

6. Actual and Targeted Installed Wind Capacity

7. State Wise Wind Energy Scenario

8. Doubly Fed Induction Generator (DFIG)
• In DFIG, both the stator and rotor are connected to the supply in which the stator
is directly connected to the supply and the rotor is connected to the supply
through converter.
• Basic concept is to interpose the frequency converter between the variable
frequency induction generator and the fixed frequency grid.
• DC capacitor linking the stator and rotor side converter are used to store the
power from induction generator for further generation.

9. Block diagram

10. Challenges faced by wind energy sector
• Majority of wind power farms in India have reached their commissioned period and
hence require maintenance and repowering. As a result, wind power possesses a low
plant load factor compared to fossil fuels.
• Absence of proper government policies and framework.
• Due to non-availability of proper grid infrastructure the amount of energy produced in
wind farms is not transferred effectively to consumers which results in wastage of
energy.
• Other barriers faced by the wind sector are availability of land for wind farm erection,
withdrawal of accelerated depreciation, implantation of revised tariff as per CERC
guidelines.

11. Simulation model

12. RESULT
The dynamic behavior of above system for different faults such as single line to ground fault, lint
to line fault and double line to ground fault are studied and the graphs for generated real power
and reactive power are presented in the following figures.
Fig 1: Line to ground fault

13. Fig 2: Line to line fault

14. Fig 3: Double line to ground fault

15. Future scope
• There is a need to develop a controller, which can effectively improve the dynamic stability, transient
response of the system during faulty grid conditions.
• To develop a protection system for power converter and DFIG for large disturbances like 3-phase
fault of little cycle duration as the power converter is very sensitive to grid disturbance.

16. Conclusion
• India has to match the growth rate in the global wind energy sector, outstanding regulatory and policy issues
need to be urgently addressed.
• The performance and controllability of DFIG are excellent in comparison with fixed speed induction
generator systems.
• It is necessary to introduce long term comprehensive stable policies to support and boost the necessary
investments in renewable energy.

17. References
• MADHU SINGH, PAYAL SINGH, “A REVIEW OF WIND ENERGY SCENARIO IN
INDIA,” IRJES, VOL. 3(4), 87-92, APRIL (2014).
• N.DHAYANIDHI, D.MURALIDHARAN, “DYNAMIC BEHAVIOR OF DFIG WIND
ENERGY CONVERSION SYSTEM UNDER VARIOUS FAULTS,” IJAREEIE VOL. 3,
ISSUE 1, JANUARY 2014.
• S. MULLER, M. DEICKE AND RIKW. DE DONCKER, “DOUBLY FED INDUCTION
GENERATOR SYSTEMS FOR WIND TURBINES,” IEEE, INDUSTRY APPLICATIONS
MAGAZINE, VOL. 8, ISS. 3, PP.26-33, MAY/JUNE 2002.