The objective of this project is to develop a supercapacitor-based energy storage system for piezoelectric roadway energy harvesting applications. This report summarizes the author’s work on supercapacitor modeling and characterization. It first discusses the applicability of Peukert’s law to supercapacitors and its application in predicting the supercapacitor discharge time during a constant current discharge process. Then, it examines the dependence of the supercapacitor Peukert constant on its terminal voltage, aging condition, and operating temperature. Finally, it studies the supercapacitor energy delivery capability during a constant power discharge process. Based on the work on supercapacitor characteristics, a supercapacitor-based energy storage system is being developed.
Hengzhao Yang received the BS degree in optoelectronics from Chongqing University, Chongqing, China, in 2005, the MS degree in microelectronics and solid-state electronics from the Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China, in 2008, and the PhD degree in electrical and computer engineering from the Georgia Institute of Technology, Atlanta, GA, USA, in 2013.
Since 2016, he has been an Assistant Professor with the Department of Electrical Engineering at California State University, Long Beach. He was a Postdoctoral Fellow with the Georgia Institute of Technology from 2013 to 2015 and a Visiting Assistant Professor with Miami University from 2015 to 2016. His current research interests include supercapacitor modeling and characterization, design and control of energy storage systems, and power electronics for energy storage applications.