NDLI: Control of a Cascade STATCOM With Star Configuration Under Unbalanced Conditions

Content Provider	IEEE Xplore Digital Library
Author	Qiang Song Wenhua Liu
Copyright Year	1986
Abstract	A control scheme for star-connected cascade static synchronous compensators (STATCOMs) operating under unbalanced conditions is proposed. The STATCOM is assumed to be connected to an equivalent three-phase star-connected power supply. By selecting the line-to-neutral voltages of the equivalent power supply, zero average active power in each phase can be obtained under unbalanced compensation currents or unbalanced supply voltages. Furthermore, to implement a separate control for the three-phase dc-link voltages, the average active power in each phase can also be adjusted to a target value determined by the dc-link voltage control loop. Then, by forcing the converter neutral voltage to be equal to the counterpart of the equivalent power supply, the STATCOM can be decoupled into three single-phase systems and the line-to-neutral voltage of the equivalent power supply can be used as the input voltage to the corresponding phase leg. Accordingly, reference current tracking and dc-link voltage maintaining can be simultaneously achieved under unbalanced conditions. The valid operating range of the star-connected cascade STATCOM under unbalanced conditions is also analyzed. The proposed control scheme has been tested using the power systems computer-aided design/electromagnetic transient in dc system (EMTDC) simulation results and the experimental results based on a 30-kVAr cascade STATCOM laboratory prototype are proposed.
Sponsorship	IEEE Power Electronics Society
Starting Page	45
Ending Page	58
Page Count	14
File Size	1401720
File Format	PDF
ISSN	08858993
Volume Number	24
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Automatic voltage control Power supplies Voltage control Power system simulation Current supplies Leg System testing Power system analysis computing Power system transients Power system control unbalance operation Cascade multilevel converter static synchronous compensator (STATCOM)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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