Fault Elimination In Transmission Line Using Eleven Level Statcom

this paper we deals with a simultaneous compensators (statcoms) uses several levels converters as: a) lower harmonic injection into the power system; a) decreased stress on the electronic components due to decreased voltages; and c) lower switching losses. one unfavorable, however, is the increased likelihood of a switch failure due to the increased number of switches in a several levels converter. a single switch failure, however, does not necessarily force a (2n + 1)-level statcom offline. even with a decreased number of switches, a statcom can still supply a significant range of control by removing the module of the not working switch and continuing with (2n 1) levels. in this paper shows an approach to detect the existence of the not working switch, identify which switch is not working, 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.