Generalized Implementation of Switching-Loss-Minimized Space-Vector Modulation for Three-Level Converters

摘要

With increasing integration of the intermittent andvolatile renewable energy resources into the existing ac gridinfrastructure, the grid stability is decreasing. Large batterystorage systems are proposed to act as short-time buffer to copewith transient instabilities. A promising converter to interfacesuch low-voltage high-power battery banks is the T-type Neutral-Point-Clamped Converter (TNPC). A generalized implementationof a variant of the well-known space vector modulation featuringlower losses is proposed in this work. The derived relations toselect a particular switching sequence are based on the binarylogic and symmetry of the possible states in such a three-levelconverter. The algorithm proposed in this work dynamicallyadjusts the switching sequences to accommodate capacitive aswell as inductive behavior.