Detection and Mitigation of Fault in 11-Level Converter STATCOM

K.Priyanka1 and C.Venkatesh2

1, 2Dept. of electrical and electronics engineering,

S.R. Engineering college, JNTUH, Warangal, India. email:


            This paper introduces an approach to detect the existence of thefaulted 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 Many static synchronous compensators (STATCOMs) utilize multilevel converters due to the following: 1) lower har- monic 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 like- lihood of a switch failure due to the increased number of switches in a multilevel converter. Due to its unique topology, the Modular Multilevel STATCOM has many advantages but requires a sophisticated controller and puts higher requirements on simulation tools. 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.

Index Terms- Fault detection, multilevel converter, static synchronous compensator (STATCOM).




International eJournal of Mathematics and Engineering
5, Issue
2, Pages:  2401 - 2409