KRISHNASAMY COLLEGE OF ENGINEERING & TECHNOLOGY A NOVEL INTEGRATED AC/DC/AC CONVERTERS FOR DIRECT DRIVE PERMANENT MAGNET WIND POWER GENERATION SYSTEM by SHEELA AROKIA MARY . J M.E ( EMBEDDED SYSTEM TECHNOLOGIES) Under the Guidance Of Mr.S.Sivasakthi M.E., Associate Professor Head of the Department Department of EEE
1. A NOVEL INTEGRATED AC/DC/AC CONVERTERS FOR DIRECT DRIVE
PERMANENT MAGNET WIND POWER GENERATION SYSTEM by SHEELA AROKIA MARY
. J M.E ( EMBEDDED SYSTEM TECHNOLOGIES) Under the Guidance Of
Mr.S.Sivasakthi M.E., Associate Professor Head of the Department
Department of EEE
2. To reduce the switching loss & Minimize the circulating
current in the power converters used in Wind power generation
system and to improve the Power factor & overall performance of
the system.
3. 24 switches are used in Power converters. Separate
stabilizing circuit is used Switching losses are high Presence of
Harmonics are high
4. 9 switches are used. Switching losses are reduced.
Circulating current is minimized. Less harmonics. Power factor
improvement is made.
5. This proposed system has AC/DC/AC converter. In existing
ac-ac converter topologies, 2 level 6 switch comprising a common dc
link capacitor & VSI are frequently used In order to minimize
the switching loss , we are implementing a topology of 9 switch
USMC for wind energy conversion system. For rectification, a 3
switch Vienna rectifier is used.
6. In inverter stage it employs an 6 switch VSI. Hence the
number of switches & switching losses are reduced. The
circulating current is minimized & Power factor improvement is
made. As a result harmonics are reduced & overall efficiency is
improved.
7. PWM using PI Controller Technique.
8. It converts wind energy into mechanical energy. Types
horizontal axis wind turbine & vertical axis wind turbine.
Efficiency & Power generation of wind turbine depends on
increase in height of the tower & speed of the wind. Direct
drive- Generator directly coupled with turbine.
9. It converts the mechanical power output of wind turbine into
electrical power. Principle-Faradays law of electromagnetic
induction. Can be extremely large power ratings up to 1500MW They
are known as synchronous machines because they operate at
synchronous speed (speed of rotor always matches supply
frequency)Ns=120 f/p. Instead of field winding, permanent magnet is
used. Does not require DC supply, Condenser not needed. So output
power is fully utilized and total loss is reduced, higher
efficiency.
10. 3 phase AC source LC Filter Solid state switches Diodes
& capacitive circuits DC Link Micro controller based pulse
signal
11. Unidirectional 3phase AC/DC converter. 3 power switches. PF
improvement Harmonics are reduced.
12. 9 switches. Converts unstable AC to stable AC voltage.
Switching loss is reduced Circulating current is minimized. Overall
efficiency is improved.
14. Power factor Disadvantages of lagging power factor PF
improvement equipments Power triangle
15. This paper has comprehensively addressed the mimization of
circulating current and switching losses. In this method the
unstable AC voltage is converted to a stable AC voltage with power
factor improvement. Experimental verification of the power
converters confirms the good performance and promising features of
the proposed directly driven permanent magnet wind power generation
system.
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