Enhanced Diagnosis Method for Open-Circuit Faults in NPC Inverters for SSSC Systems

This paper introduces an improved fault diagnosis technique for detecting open-circuit faults in switches of three-level Neutral Point Clamped (NPC) inverters used in Static Synchronous Series Compensator (SSSC) systems. Building on prior research focused on two-level converters, the method extends vector current path analysis to three-level NPC converters operating under Watt–Var control, addressing both single and multiple switch fault scenarios.

Originally published by gnews