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This paper deals with the detection and mitigation of faults in 13-level converter STATCOM. The FACTS device used is flexible in reactive power compensation, voltage regulation, to reduce harmonics of the grid that must be protected from faults in the switches. Due to frequency switching of the STATCOM, the possibility of the switch malfunction such as open circuit and short circuit faults are predominant. Many static synchronous compensators use multilevel converters to lower the switching faults. The pulse width modulation techniques applied to a proposed cascaded 13-level to detect the faulty switch and mitigate it. In this paper the performance analysis of PWM techniques are computed with dynamic fault conditions.