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Determination of Equivalent Circuit Parameters of Supercapacitor and its Testing with Three Phase Inverter

Supercapacitor technology has been available commercially for over the past decade. They can store more energy than conventional capacitors and are available in various sizes. They can be charged and discharged faster than batteries. Because of so many advantages such as high power cycling capacity, low maintenance and long service life, wide operating temperature and lowest internal Equivalent Series Resistance(ESR), supercapacitors are used for an unlimited number of applications nowadays. There is a strong need to gain a better understanding of supercapacitors when used in electric utility applications. This requires suitable models that can be incorporated into different software programs currently used to create dynamic simulations for applications such as MATLAB Simulink, PSPICE, PSCAD etc. This paper focuses on the use of charging and discharging tests to develop the equivalent circuit models to characterize symmetric supercapacitors for electric utility applications. Design, fabrication and testing of three phase IGBT based inverter is also done for interfacing with supercapacitor and grid. Control algorithm is implemented in PIC16F877a microcontroller. Results are presented in the paper, which show that supercapacitor is supplying real power needed by the load and losses of the inverter.