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Title: A zero sequence voltage injection method for cascaded H-bridge D-STATCOM
Authors: Yarlagadda S.R.
Pathak, M. K.
Published in: Journal of Power Electronics
Abstract: Load variations on a distribution line result in voltage fluctuations at the point of common coupling (PCC). In order to keep the magnitude of the PCC voltage constant at its rated value and obtain zero voltage regulation (ZVR), a D-STATCOM is installed for voltage correction. Moreover, the ZVR mode of a D-STATCOM can also be used to balance the source current during unbalanced loading. For medium voltage and high power applications, a D-STATCOM is realized by the cascaded H-bridge topology. In the ZVR mode, the D-STATCOM may draw unbalanced current and in this process is required to handle different phase powers leading to deviations in the cluster voltages. Zero sequence voltage needs to be injected for ZVR mode, which creates circulating power among the phases of the D-STATCOM. The computed zero sequence voltage and the individual DC capacitor balancing controller help the DC cluster voltage follow the reference voltage. The effectiveness of the control scheme is verified by modeling the system in MATLAB/SIMULINK. The obtained simulations are further validated by the experimental results using a dSPACE DS1106 and five-level D-STATCOM experimental set up. © 2017 KIPE.
Citation: Journal of Power Electronics (2017), 17(4): 1088-1096
Issue Date: 2017
Publisher: Korean Institute of Power Electronics
Keywords: Cascaded H-bridge converter
Power quality
Un-balanced load
Voltage balancing
Zero sequence voltage
ISSN: 15982092
Author Scopus IDs: 57195150977
Author Affiliations: Yarlagadda, S.R., Department of Electrical Engineering, Indian Institute of Technology, Roorkee, India
Pathak, M.K., Department of Electrical Engineering, Indian Institute of Technology, Roorkee, India
Corresponding Author: Yarlagadda, S.R.; Department of Electrical Engineering, Indian Institute of TechnologyIndia; email:
Appears in Collections:Journal Publications [EE]

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