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IN THE NAME OF ALLAH THE MOST
MERCIFULAND MOST GRACIOUS
TITLE:
AN IMPROVED POWER QUALITY DIRECT AC-TO-AC FREQUENCY
CONVERTER
ADVISOR AND ADVISEE
• Advisor:
• Dr. NaveedAshraf
• Advisee:
•Muhammad Durraiz Shuaib
•Ahmad Khan
•Mohsin Sajjad
•NadeemAbbas
RECTIFICATION
• Half-wave Rectification
• Full-wave Rectification
LC FILTER
• Capacitor
• Inductor
• Pure dc reach at the load
CYCLOCONVERTERS
• AC to AC converter without using dc link
• Converts AC signal of fixed frequency to AC signal with variable frequency
• It is also refered as frequency changer
• This conversion is done by using switches like diodes and IGBTs
CLASSIFICATION OF
CYCLOCONVERTERS
• Based on output frequency
• Step up Cycloconverter
• Step down Cycloconverter
INDUCTION HEATING (IH)
• Efficiency of heat transfer
Induction heating – 60%
Gas fired furnace – 15%
WORKING
PROBLEM STATEMENT
• Indirect method
• Direct method
SYSTEM IN PAST
SINGLE PHASE MATRIX CONVERTER
• Four bi-directional switches, MOSFETS/IGBTS, Diodes
• Capable of:
Blocking voltage
Conducting current in both directions
• SPMC as Cyclo-Converter
• Two cases
Positive half cycle
Negative half cycle
CIRCUIT OF SUGGESTED TECHNIQUE
POSITIVE HALF CYCLE
NEGATIVE HALF CYCLE
SPMC WORKING AS RESONANT
CONVERTER
SPMC WORKING AS RESONANT
CONVERTER
SPMC WORKING AS FREQUENCY
CONVERTER
SIMULATION RESULTS
• Load R=100 ohm
• Output frequencies 100 Hz, 150 Hz and 200 Hz
• By changing the time period of this PWM controller, we get desired output
frequency
SOFTWARE
SOFTWARE
SOFTWARE
SOFTWARE
SOFTWARE
HARDWARE
FEATURES
• Unique generation capability of resonant frequency
• SPMC can achieve a high frequency current easily
• Traditional switching technique can generate integral multiple of input
frequency i.e., 50 Hz, 100 Hz, 150 Hz etc
• Simple design
• Generates two pulses
• Four pulses in previous switching techniques
• Can be applied for both operation of SPMC i.e., as a frequency changer or as
resonant converter.
APPLICATIONS
1. IH
Domestic application
a) Induction cooker
b) Induction geyser
c) Induction heater
Industrial application
a) Brazing
b) Melting
SUSTAINABLE DEVELOPMENT GOALS
(SDG’S)
• SDG 7: Affordable And Clean Energy
• SDG 9: Industry Innovation And Infrastructure
• SDG 12: Responsible Consumption And Production
THANKS

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durraiz shuaib khanjdddkdjsbkjdbskdb p1 5.pdf