Electric double layer capacitors (EDLC) have attracted much attention as energy storage devices in recent years because of their wide variety of applications. Use of EDLC-electronics combination, called Energy Capacitor System (ECS), as an integrated supply source in place of batteries in a PV system for load leveling will play a key role in the further development of new areas of applications in PV as well as other power systems. The Electrical and Electronic Engineering department of Kitami Institute of Technology has taken up a joint collaboration research program on PV-ECS system with four research and manufacturing companies, funded by New Energy and Industrial Technology Development Organization (NEDO). In this work an effort has been taken to develop a new small distributed generation system of PV-ECS with a daily load leveling function. Another aim is to investigate the performance of ECS in respect of charge-discharge characteristics, energy efficiency and life cycle as an integrated autonomous supply source in a grid connected PV system. The overall performance of the system as a load leveling power source has been evaluated and the results are drawn graphically and discussed.
A fuzzy logic based switching control system has been proposed for an electrical double-layer energy capacitor system(ECS) to enhance the overall stability of electric power systems. The real power flow signal at the location of the ECS is utilized to generate switching control signals for the regulation of charging or discharging power to and from the ECS. Through the proposed control, the damping of poorly damped oscillations can be highly improved. To demonstrate the efficiency of the proposed switching control, nonlinear simulations have been performed for a one-machine infinitebus system and also experimental evaluations have been performed on the Analog Power System Simulator at the Research Laboratory of Kyushu Electric Power Co. Fundamental testing for an actual ECS with the capacity of 250kJ are now ongoing to demonstrate the feasibility of the proposed switching control.
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