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Tuyen, Nguyen Duc,Fujita, Goro,Funabashi, Toshihisa,Nomura, Masakatsu The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.1
One operation circumstance in Dispersed Generation (DG) concepts, an island, is formed when one or more DGs and an aggregate of local loads are disconnected from the main grid and then, remain operational as an islanded entity. This condition of islanding is conventionally undesirable. Consequently, the customers will suffer the blackout. Recently, this blackout phenomenon has been eliminating by facilitating islanded operation. This paper presents a passive method in detecting islanding for DGs by measuring the negative-sequence impedance differences between islanded mode and grid-connected mode at the line frequency. Subsequently, the islanded entity is connected to a backup system by Solid State Transfer Switch (SSTS) in order to smoothly and quickly keep electricity available to customers.
A simple DC bias elimination technique for Dual-Active-Bridge DC/DC converters
Duy-Dinh NGUYEN,Kazuto YUKITA,Goro FUJITA,Minh Cao TA 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
A new and simple DC bias elimination technique for a Dual-Active-Bridge DC/DC converter is proposed in this paper. The principle is to make the positive and negative volt-seconds of the magnetizing inductance balance when the phase shift changes. This can be done with minimum disruption on the overall control system by some minor modifications on the setting of the PWM modules of the digital signal processor. Thanks to the technique, the DC bias is c ompletely eliminated. Besides, the system dynamics is much improved.