Adaptive dc-link voltage regulation for DSTATCOM under load variations

A new algorithm is proposed for adaptive dc-link voltage regulation in DSTATCOM for power quality improvement. Generally, in conventional DSTATCOM operation, the dc-link voltage is maintained constant by PI controller (i.e, 2 times peak of PCC voltage). Because of fixed voltage, the switches of Volt...

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Bibliographic Details
Main Authors: Myneni, Hareesh, Kumar, G. Siva, Sreenivasarao, D.
Format: Conference Proceeding
Language:English
Subjects:
Adaptive dc-link voltage
Capacitors
DSTATCOM
Inverters
Power quality
Reactive power
Stress
Switching loss
Voltage control
voltage source inverter
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Summary:A new algorithm is proposed for adaptive dc-link voltage regulation in DSTATCOM for power quality improvement. Generally, in conventional DSTATCOM operation, the dc-link voltage is maintained constant by PI controller (i.e, 2 times peak of PCC voltage). Because of fixed voltage, the switches of Voltage Source Inverter (VSI) are subjected to high voltage stresses during off-peak load conditions. It leads to increase in switching losses and deterioration of inverter reliability. During off-peak load, lesser value of dc-link voltage is sufficient to improve power quality. The proposed algorithm will give the reference dc-link voltage corresponding to load rating, and it is computed based on filter burden. The advantage of proposed algorithm is switching stresses reduced. The proposed algorithm is validated through detailed simulation studies.
ISSN:2159-3450
DOI:10.1109/TENCON.2016.7848577