What is a positive sequence model of an induction machine?

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A positive sequence model of an induction machine is used in Doubly Fed Induction Generator (DFIG) arrangements to simplify analysis under balanced conditions, focusing on the primary operational characteristics. This approach assumes that the system operates under symmetrical conditions, which is often the case for grid-connected applications. The implications of using a positive sequence model include reduced complexity and computational efficiency, but it may overlook critical dynamics in unbalanced scenarios. Negative and zero sequences become relevant when the phases are unbalanced, as they can significantly impact performance and stability. Understanding these aspects is crucial for accurate modeling and simulation in power systems.
anon6912
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I'm trying to understand a 3 phase induction machine model used as a generator in a Doubly Fed Induction Generator (DFIG) arrangement in Simulink.

In this model for the induction generator component, they have stated that the model is a "Positive sequence model" of the induction generator.

Whats the reasoning behind modelling it in this way for this application?
What are the implications and limitations of this?
What about the negative and zero sequences, arnt they worth considering?

Sorry for the number of questions, I wanted to explain my lack of understanding as comprehensively as possible:smile:
 
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Zero and negative sequence models are useful only when the three phases are unbalanced.
 

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