SIMPLIFIED MODELLING OF INDUCTION GENERATOR IN STATOR FLUX ORIENTED SYNCHRONOUS REFERENCE FRAME
DOI:
https://doi.org/10.29121/shodhkosh.v5.i7.2024.1774Keywords:
Stator Flux-Oriented (SFO) Reference Frame, Small-Signal Analysis, Small-Signal Linear & Large-Signal Transient DisturbancesAbstract [English]
The selection of an appropriate reference frame is crucial for the accurate modeling of Doubly Fed Induction Generators (DFIGs). This paper presents a simplified approach to steady-state modeling of DFIGs using the Stator Flux-Oriented (SFO) Synchronous Reference Frame. The primary objective is to derive the steady-state characteristics of both directly grid-connected Squirrel Cage Induction Generators (SCIGs) and rotor-side controlled DFIGs. By leveraging the SFO reference frame, which ensures that all q-d transformed variables assume constant values, the voltage equations of a DFIG can be reduced from differential to algebraic equations, thus simplifying the analysis. The results demonstrate that the SFO reference frame provides a clear and close loop analytical solution for steady-state operating points, in contrast to alternative reference frames that could yield complex, highly coupled non-linear systems. This simplification is particularly advantageous as it aligns with the machine control framework used during transient periods. The steady-state solution obtained using the SFO reference frame is ideal for initializing control and analyzing both small-signal linear and large-signal transient disturbances, confirming its efficacy and suitability for practical applications.
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Copyright (c) 2024 Rishikesh Choudhary, Kumar Jyotiraditya, Dipo Mahto
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