DC VOLTAGE BALANCE CONTROL FOR THREE-LEVEL NPC POWER CONVERTERS WITH EVEN-ORDER HARMONIC ELIMINATION SCHEME

摘要

Three-level inverter and rectifier power conversion systems and space vectormodulation (SVM) controls having even-order harmonic elimination for neutralvoltagebalancing with a predefined vector switching sequences for half-wave symmetryinopen loop system operation. The vector sequence listings for each SVM diagramsegment includes switching state entries individually indicating one of threepossibleswitching state levels positive (P), zero (0), or negative (N) for each ofthree or moreswitching groups of the power conversion system, with listings for each pairof first andsecond diametrically opposite diagram segments include symmetrically oppositeswitching states, with positive levels in the entries of the listing for thefirst segmentcorresponding to negative levels in the entries of the listing for the secondsegmentand vice versa.