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Fault detection and diagnosis of voltage source inverter using the 3D current trajectory mass center

This paper investigates the use of the current trajectory mass center in a three dimensional referential. The proposed approach uses the inverter output currents. These currents are used to obtain a typical pattern in a three dimensional referential. According the fault type different patterns is obtained. In this way, with the proposed approach it is possible to detect and identify the faulty power switch In order to automatically identify the different patterns, it is used an algorithm to obtain a mass center of the 3D current trajectory. This results in a fast and reliable fault detection method. The applicability of the proposed technique, are confirmed through several simulation and experimental results.