Robust Multi-Variable Controller Design for Two-Input Two-Output Fourth-Order DC-DC Converter

Abstract

The presented two-input two-output fourth-order integrated (TITO-FOI) DC–DC converter is capable of regulating DC-bus voltage and low voltage source current with only two switches and four energy storage elements. Each switch duty control signal in TITO-FOI converter system will affect the two output variables causing interactions. These interactions must be measured for proper controller structure selection. Interactions measurements may not be accurate for a converter system as some methods suggest centralized and some other suggest decentralized control schemes. Hence, there is an ambiguity in selection of suitable controller architectures. To overcome such an ambiguity a centralized interaction independent controller was designed for TITO-FOI DC–DC converter using ${\mathit{H}}_{\mathit{\infty }}$ loop-shaping design procedure. The effectiveness of TITO-FOI converter along with this centralized controller for the regulation of load division and bus voltage is demonstrated with simulation studies using a 36 V/12 V to 24 V, 100 W, prototype DC power distribution system.

Keywords:

• centralized controller
• fourth-order converter
• ${\mathit{H}}_{\mathit{\infty }}$ robust stabilization
• stability margin
• uncertainty

Additional information

Notes on contributors

Veerachary Mummadi

Veerachary Mummadi was born in Survail, India, in 1968. He received the Dr. Eng. degree in electrical engineering from the University of the Ryukyus, Nakagami, Japan, in 2002. Since July 2002, he has been with the Department of Electrical Engineering, Indian Institute of Technology Delhi, New Delhi, India, where he is currently a Professor. His fields of interest are power electronics and applications, design of power supplies, multi-input and modular multilevel converters for DC-grid, multi-variable control theory applications in power electronics, and digital and intelligent control solutions for power supplies.

Amarendra Reddy Bhimavarapu

Amarendra Reddy Bhimavarapu received B.Tech in EEE from Bapatla Engineering College, Bapatla and ME (Control Systems) from Andhra University. He is currently working towards PhD degree at IIT Delhi, New Delhi, India. He is working as Assistant Professor in Department of Electrical Engineering, AUCE, Andhra University, Visakhapatnam. His fields of interest are control theory and applications.