EXPERIMENTAL VERIFICATION OF A SPACE VECTOR MODULATION TECHNIQUE FOR NPC INVERTERS

Abstract:- The paper analyses and experimentally verifies two different modulation strategies based on a Space Vector Modulation (SVM) technique, specifically designed for three-phase Neutral Point Clamped (NPC) inverters. Proposed technique was designed to maintain, also in NPC inverters, all the advantages of SVM used in traditional two-level inverters. The employment of two different modulation strategies, when different operating conditions occurs, allows the improvement of the harmonic content of the output currents produced by NPC inverters. After a detailed description of the Space Vector Modulation technique, the two modulation strategies are compared by the means of some significant experimental results. Key-Words:- NPC Inverter, Modulation technique, High power converters, Traction locomotives