AC-AC VOLTAGE REGULATION BY SWITCH MODE PWM CÛK VOLTAGE CONTROLLER WITH IMPROVED PERFORMANCE by Palash Kumar Banerjee 
 A project presented to Ryerson University in partial fulfillment of the requirement for the degree of Master of Engineering in the program of Electrical and Computer Engineering Toronto, Ontario, Canada, 2014

 ABSTRACT
Title: AC-AC Voltage Regulation by Switch Mode PWM Cûk Voltage Controller With Improved Performance
Degree: Master of Engineering
Year: 2014
Student Name: Palash Kumar Banerjee
Program: Electrical and Computer Engineering University: Ryerson University, Canada

In this research project, an AC Cûk voltage regulator has been proposed for maintaining constant voltage across the load during wide range of input voltage fluctuations. The proposed AC Cûk voltage regulator made of practical IGBT switches has been investigated for both manual and automatic control circuit. A fraction of the output voltage is taken as the input voltage of the control circuit and produce the error signal if any changes occur in the output voltage. The modified error signal is used to make PWM signals for switching devices as per output voltage of regulator. The PWM controls the ON/OFF time (Duty cycle) of switching devices (IGBTs) of the proposed regulator. As a result the regulator is maintaining a constant voltage across the load during any change in supply voltage. The simulation waveforms and the calculated total harmonics distortion (THD) values are compared with previously studied AC Buck-Boost regulator. The observed simulated waveforms of output voltage, output current and input current and THD values have been improved in case of proposed AC Cûk voltage regulator.

LINK VIEW FULL TEXT
http://digital.library.ryerson.ca/islandora/object/RULA:2617