NDLI: Load leveling using EDLCs under PLL control

Content Provider	IEEE Xplore Digital Library
Author	Ariyoshi, G. Harada, K. Yamasaki, K. Murita, K.
Copyright Year	2000
Description	Author affiliation: Res. Lab., Kyushu Electr. Power Co. Inc., Fukuoka, Japan (Ariyoshi, G.)
Abstract	The power demand has been increasing year after year in Japan and a steep projection appears during daily peak-load periods particularly in high summer due to growing demand for space cooling, resulting in the problem of a great day versus night demand gap. Such a demand gap appearing daily and seasonally is a priority for power utilities to ensure reduced service costs and dependable power supply. The study was intended to demonstrate the feasibility of an energy storage system for load leveling based on the electric double-layer capacitor (EDLC), which is safer, has a longer service life and needs far less maintenance service than the secondary cell. The system as a whole works to store surplus energy from a commercial AC line in an EDLC bank during the nighttime and release such energy for use during the daytime peak-load period through a novel interface circuit. This paper particularly reports on the working principle and experimental results of the interface circuit, which comprises a voltage control oscillator (VCO), a bi-directional DC/DC converter, a bi-directional inverter, a coupling inductor, the whole circuit being subjected to PLL control, so that automatic transfer of energy between DC from an EDLC bank and AC from a commercial power line is allowed to take place in a simple, reliable and less costly manner on the basis of DC voltage as if electric charging and discharging take place in a full DC system.
Starting Page	774
Ending Page	780
File Size	686358
Page Count	7
File Format	PDF
ISBN	0780358643
DOI	10.1109/APEC.2000.822592
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-02-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Supercapacitors Phase locked loops Circuits Voltage-controlled oscillators Bidirectional control Power system reliability Power demand Adders Space cooling Costs
Content Type	Text
Resource Type	Article

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