Characterization and Switch Localization of Three-Phase Interleaved Buck Converter Under Open-Circuit Faults

Abstract

The fault incidence possibility in power conversion system increases due to increase in number of power semiconductor devices. The converters used in the system must be fault tolerant for its continuous operation and reliability. The interleaved multiphase converters have many advantages over the conventional converters with respect to input/output current. In healthy condition, the output of three-phase interleaved buck converter (IBC) contains high frequency and smaller magnitude current ripple. Whereas, due to open-circuit faults in IBC the output current ripple magnitude increases and also small frequency ripple injected in the output current, resulting the quality of the output performance parameters degrade. In order to detect and diagnose the faults, a fast fault detection and identification algorithm is required. This research article proposed an algorithm to detect and localized the open-circuit switch faults (OCSFs) in a three-phase IBC. Simulation results validate the capability of the proposed fault detection and identification algorithm.