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The performance improvement of dynamic voltage restorer based on bidirectional dc–dc converter

Abstract
In this study, bidirectional dc–dc (BDC) converterbased dynamic voltage restorer (DVR) is proposed for compensation of severe voltage sag/swell problems in a medium voltage system. Among these problems, voltage swells provoke the voltage rise at dc-link capacitor of DVR. This undesirable situation may explode the dc-link capacitors and switches, and cause high-power losses. In DVR topologies,
unidirectional dc–dc converter-based DVRs allow only monodirectional power energy transfer from battery to dclink capacitor. To prevent voltage rise at dc-link capacitor under severe voltage swell conditions, bidirectional power flow must be achieved between dc-link capacitor and battery. The main contribution of this study is that BDC converter is first exploited in DVR to solve voltage rise problem at dclink capacitor during voltage swell. Owing to this topology, power can flow both from battery to dc-link capacitor of multilevel
inverter or vice versa. For this purpose, proportionalintegrator (PI) controller-based algorithm is improved for BDCconverter to compensate voltage sags/swells. This algorithm keeps the dc-link voltage constant during voltage sag/swell. The validity of proposed topology and control method is verified with PSCAD/EMDTC. The performance results demonstrate that BDC converter-basedDVR achieves good performance to control dc-link voltage under voltage sag/swell situations.

Keywords : DVR · Voltage sag · Voltage swell · Bidirectional dc–dc converter · dc-link control

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Informasi Detail
Judul Seri
-
No. Panggil
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Penerbit
: Springer-Verlag Berlin Heidelberg.,
Deskripsi Fisik
Electr Eng (2017) 99:285–300
Bahasa
English
ISBN/ISSN
1432-0487
Klasifikasi
NONE
Tipe Isi
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Tipe Media
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Tipe Pembawa
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Edisi
Electronical engineering ; Volume 99, Issue 1, Mar
Subjek
TEKNIK ELEKTRO
Info Detail Spesifik
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Pernyataan Tanggungjawab
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