Turn to turn fault modelling of three Phase PMSG having rotor Magnets of non-uniform strength

Abstract

This paper studies the turn to turn fault for Three phase PMSG for the rotor magnets with non-uniform field strength. The high frequency Permanent Magnets are becoming more popular because of their small size and high power density. They are used for the brushless excitation of synchronous motors and generators. The exceeding use of PMSG in various application makes necessary to analyze their fault stability conditions for practical aspects like variation in the rotor magnetic strength. For better comprehension, fault have been carried out and studied at different frequency and detailed study of terminal voltage and short circuit current has been done which are also verified experimentally. For experimental purpose, a prototype of three phases PMSG has been constructed, coupled by a DC motor acting as a prime mover. The experimental results have been validated by theoretical derivation and simulation results.