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Elimination Of Coupling Transformer Core Saturation In Cascaded Multilevel Converter Based T -Statcom Systems

Elimination Of Coupling Transformer Core Saturation In Cascaded Multilevel Converter Based T -Statcom Systems

ABSTRACT:

          This project 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.

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