A New Space Vector Pulse Density Modulation Scheme for Two-Level Five Phase Induction Motor Drive

Abstract

Variable speed drives incorporating multiphase motors have started gaining attention in recent years due to their benefits over three-phase counter parts. In this article, we propose a digital control scheme based on space vector pulse density modulation for two-level five phase induction motor drive. The scheme combines principles of digital signal processing techniques, such as sigma delta modulation and vector quantization, along with space vector modulation to form computationally efficient motor drives. In this article, vector space is divided into ten nonoverlapping regions, with each region partitioned into three voronoi regions. The reference vector is vector quantized to the nearest switching vector. Absence of dwell time calculations, less memory requirements, and reduced computational complexity of the scheme along with reduced acoustic noise and electromagnetic interference in the drive are the core advantages of the scheme. The work has been experimentally implemented with 2 HP five-phase induction motor drive and the results are compared with space vector pulsewidth modulation scheme for validation purpose.