Protection scheme for full wave controlled three phase rectifier base on multi fault detection algorithms

Different techniques of converter faults detection is studied. Between them zero components, min-max-average and slop of space vector methods are chosen because they need little computation time and complexity. A new fault detection method is proposed base on negative component for the first time in this paper. Then this method plus the three selected algorithms are used to developing a protection scheme that detects converter switches faults as increasing ON resistance, decreasing OFF resistance, short circuit and open circuit faults. As protection scheme must have correct operation in different situations, three transient detector units are used for diagnosing transients like phase broken, input voltage harmonics, low current and input ac transient units that detect out of protection zone conditions. Test results of the proposed protection scheme in different situations discover the efficiency of the proposed protection scheme in faults diagnostics and protection operation.