Energy storage and loss in fractional-order circuit elements

• Published in: IET circuits, devices & systems Vol. 9; no. 3; pp. 227 - 235
• Main Authors: Hartley, Tom T, Veillette, Robert J, Adams, Jay L, Lorenzo, Carl F
• Format: Journal Article
• Language: English
• Published: Stevenage The Institution of Engineering and Technology 01.05.2015; John Wiley & Sons, Inc
• Subjects: capacitors; Charging; Circuits; constant-current charging; constant-current cycling; constant-current discharging; constant-voltage charging; constant-voltage cycling; constant-voltage discharging; Cycles; Devices; Discharge; Electric potential; Energy efficiency; energy loss; Energy storage; energy storage device; fractional capacitive elements; general fractional-order circuit element; half-order element; inductive elements; Laplace transforms; Voltage; constant-current charging; constant-current discharging; half-order element; fractional capacitive elements; constant-current cycling; general fractional-order circuit element; inductive elements; constant-voltage discharging; capacitors; constant-voltage charging; constant-voltage cycling; energy loss; energy storage device
• ISSN: 1751-858X; 1751-8598; 1751-8598
• DOI: 10.1049/iet-cds.2014.0132

The efficiency of a general fractional-order circuit element as an energy storage device is analysed. Simple expressions are derived for the proportions of energy that may be transferred into and then recovered from a fractional-order element by either constant-current or constant-voltage charging and discharging. For a half-order element, it is shown that the efficiency of the charging phase of the cycle is equal to the efficiency of the discharging phase. The results demonstrate the duality of the fractional capacitive and inductive elements, in that the efficiency of one under constant-current cycling is the same as the efficiency of the other under constant-voltage cycling, and vice-versa.