Fault Detection and Mitigation in Multilevel Converter STATCOMs
Many static synchronous compensators (STATCOMs) utilize multilevel converters due to the following: 1) lower harmonic injection into the power system; 2) decreased stress on the electronic components due to decreased voltages; and 3) lower switching losses. One disadvantage, however, is the increased likelihood of a switch failure due to the increased number of switches in a multilevel converter. A single switch failure, however, does not necessarily force an (2n + 1)-level STATCOM offline. Even with a reduced number of switches, a STATCOM can still provide a significant range of control by removing the module of the faulted switch and continuing with (2n - 1) levels. This paper introduces an approach to detect the existence of the faulted switch, identify which switch is faulty, and reconfigure the STATCOM. This approach is illustrated on an eleven-level STATCOM and the effect on the dynamic performance and the total harmonic distortion (THD) is analyzed.
A. Yazdani et al., "Fault Detection and Mitigation in Multilevel Converter STATCOMs," IEEE Transactions on Industrial Electronics, vol. 58, no. 4, pp. 1307-1315, Institute of Electrical and Electronics Engineers (IEEE), Apr 2011.
The definitive version is available at http://dx.doi.org/10.1109/TIE.2010.2050415
Electrical and Computer Engineering
National Science Foundation (U.S.)
Keywords and Phrases
STATCOM; Fault Detection; Multilevel Converter; Static Synchronous Compensator (STATCOM); Dynamic Performance; Electronic Component; Harmonic Injection; Lower Switching Loss; Multilevel Converter; Number Of Switches; Offline; Power Systems; Single Switch; Switch Failure; Total Harmonic Distortions; Fault Detection; Synchronous Machinery
International Standard Serial Number (ISSN)
Article - Journal
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