Analysis of a Nine-phase Self Excited Induction Generator Equipped with Optimum Excitation Capacitances

Abstract

Operational advantages of multi-phase electrical machines entail exploration of an optimum phase order for different applications. Self excited induction generators are implemented on a squirrel cage induction machine and hence are characterised by their rugged, maintenance free and simple operating topology. Five, six and seven-phase variants of a multi-phase SEIG are reported in literature quite extensively. However, there are no detailed studies available for phase numbers higher than seven. In this paper mathematical model of a nine-phase SEIG (9-SEIG) in triple d-q stationary reference frame is derived. The derived equations are developed in terms of a simulation model which in combination with the experimental test-rig is utilized to study no-load and onload behaviour of proposed capacitor excited, 9-SEIG. The primary objective of this paper is to show viability of a 9-SEIG system.