Elimination of Coupling Transformer Core Saturation in Cascaded Multilevel Converter-Based T-STATCOM Systems

Date

2014-12-01

Author

Gercek, Cem Ozgur
Ermiş, Muammer

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This paper deals with coupling transformer core saturation problem in cascaded multilevel converter (CMC) based transmission-type static synchronous compensator (T-STATCOM) systems. The effects of nonlinear characteristics of the coupling transformer and CMCs on the core saturation phenomenon are investigated, and the associated mechanisms are described. In order to prevent the transformer core from being saturated, dc current components in the coupling transformer secondary lines are eliminated by modulating one or more than one voltage steps of staircase CMC voltage waveforms via the electronic gating circuitry. The proposed dc current elimination method is implemented on a 154-kV, +/- 50-MVAr CMC-based T-STATCOM system, which is operating either in interarea oscillation damping or terminal voltage regulation modes at any time in a 400/154-kV transformer substation since March 2010. The effectiveness of recommended dc current elimination method is verified in the field.

Subject Keywords

Transmission-type static synchronous compensator (T-STATCOM), Transformer core saturation, Dc current elimination, Cascaded multilevel converter (CMC)

URI

https://hdl.handle.net/11511/30754

Journal

IEEE TRANSACTIONS ON POWER ELECTRONICS

DOI

https://doi.org/10.1109/tpel.2014.2306917

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

C. O. Gercek and M. Ermiş, “Elimination of Coupling Transformer Core Saturation in Cascaded Multilevel Converter-Based T-STATCOM Systems,” IEEE TRANSACTIONS ON POWER ELECTRONICS, pp. 6796–6809, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30754.