'Institute of Electrical and Electronics Engineers (IEEE)'
Doi
Abstract
This paper presents a transient analysis of a
unified power flow controller (UPFC), and design of capacitance
of the dc-link capacitor based on that analysis. Active
power flowing out of the series device in transient states is
theoretically discussed to derive what amount of electric energy
the dc link capacitor absorbs or releases through the
series device. As a result, it is clarified that the active power
flowing out of the series device is stored in the line inductance
as magnetic energy during transient states. Design
of capacitance of the dc-link capacitor is also presented in
this paper, based on the theoretical analysis. Experimental
results obtained from a 10-kVA laboratory setup are shown
to verify the analytical results.</p