Abstract
Small signal stability analysis is conducted for an asymmetrical six-phase synchronous motor in comparison with its equivalent three-phase counterpart. For this purpose, a linearized model of the six-phase synchronous motor is developed using the dq0 approach, which is used in eigenvalue criteria to determine absolute stability in comparison with its equivalent three-phase counterpart. The analysis includes a comparison of the variation in evaluated eigenvalues associated with the stator and rotor sides according to changes in both the three and six-phase machine parameters and working conditions. Key analytical results are experimentally investigated and validated on a test rig.
Highlights
The recent trend of research activity has been focused on replacing existing three-phase machinesStability is an important factor for successful operation of an electrical machine in a steady state under small signal disturbances
Introductory analysis of a six-phase synchronous motor was presented by the present authors [15], together with the determination of stability limits for various parametric variations and working conditions [16]
These results show the more stable operation of the six-phase synchronous motor in comparison with its equivalent three-phase motor
Summary
Stability is an important factor for successful operation of an electrical machine in a steady state under small signal disturbances In this regard, the stability analysis of three-phase induction machines has been reported using the root locus technique [4], boundary layer model bracket [5], and Lyapunov’s first method [6]. A linearized model of an asymmetrical six-phase synchronous machine was developed and used to investigate its small signal stability in comparison with its threephase equivalent using the dq0 approach This analysis included the evaluation and comparison of eigenvalues using the developed linearized model of a six-phase synchronous machine under parametric variations and different working conditions (i.e., variations of voltage and speed/frequency). Key analytical results were experimentally investigated and validated on a test rig
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