An Isolated Three-Port Interleaved Flyback Boost Converter (ITPIFBC) for Grid-Connected Photovoltaic Applications

Abstract

In this paper, an Isolated Three-Port Interleaved Flyback Boost Converter (ITPIFBC) operated micro-inverter is presented to interface the Photovoltaic (PV) power generation system with the three-phase power distribution network. The integration of interleaved flyback boost circuit reduces the switching and conduction losses of the converter. The addition of a voltage multiplier circuit in the secondary side of the high-frequency transformer enhances the voltage gain and reduces the voltage stresses of the semiconductor devices used in the rectification part of the circuit. The introduction of a voltage multiplier circuit reduces the required turn’s ratio, power rating and voltage rating of the IGBTs and diodes. The duty cycle of the converter controls the power flow between the two independent power sources. The voltage control loop incorporated with the maximum power point tracking algorithm regulates the output voltage of the converter. In this work, the design, operation principle and implementation of the ITPIFBC based micro-inverter are discussed. The dynamic behavior of the proposed micro-inverter is validated by developing the 4 kW, 400 V model in both software and hardware. The simulation and experimental results showed the superior performance of the ITPIFBC converter in boosting the input voltage under various test conditions.

Keywords:

• three-port converter
• interleaved flyback boost converter
• isolated boost converter
• micro-inverter
• maximum power point tracking
• PV power generation system
• duty cycle

Additional information

Notes on contributors

Sivakumar Ranganathan

Sivakumar Ranganathan received a B.E. degree in Electrical and Electronics Engineering from Anna University, Coimbatore in 2011. He received his M.E. degree in Applied Electronics from Anna University, Chennai in 2013. He is currently working as an Assistant Professor in the department of electrical and electronics engineering, Narasu’s Sarathy Institute of Technology, Salem, Tamil Nadu, India. His current research areas are power electronics, renewable energy sources and photovoltaic power system.

Krishnamoorthi Kanagaraj

Krishnamoorthi Kanagaraj received his B.E. degree in Electrical and Electronics Engineering from the University of Madras, Chennai in 2001. He received his M.Tech. degree in Power Electronics from VIT University, Vellore in 2003. He received his Ph.D. degree in the area of High Voltage Engineering, Anna University, Chennai, India, in 2012. He is presently working as an Associate Professor in the Department of Electrical and Electronics Engineering, Sona College of Technology, Salem, India, since 2003. He is an active supervisor in Anna University, Chennai, India. His area of interest is high voltage engineering, power electronics converters and power quality.