Abstract
A simple two-axis (d-q) model of a saturated six-phase self-excited induction generator, aimed at a stand-alone renewable energy generation, is analyzed using mixed stator current and magnetizing flux as state-space variables. This new set of orthogonal transformation (dq0) is characterized with a four-saturation-element solely in-built system matrix. Selection of this model using proposed mixed variables is justified by its simplicity. Performance equations for the given machine use the magnetizing inductance (Lm) at steady state and the dynamic inductance (L). In view of simplifying the analysis, the effects of common mutual leakage inductance (Llm) and cross-saturation coupling (Lldq) across the d-q-axis of each stator have been pretermitted. The mathematical model presented herein has been verified by simulation results using a fourth-order Runge-Kutta subroutine. Analytical results were also validated by experimental results and were found to be in good agreement.
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