DQ Reference Frame in VSC Station: Fig. 1(b)

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Discussion Overview

The discussion revolves around the concept of the "dq reference frame" in the context of vector-based equivalent circuits for Voltage Source Converter (VSC) stations, as illustrated in a referenced figure. Participants seek clarification on the meaning and implications of this reference frame, particularly in relation to phasors and frequency synchronization.

Discussion Character

  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant describes the dq reference frame as related to the configuration of VSC stations and their vector-based equivalent circuits.
  • Another participant suggests that the dq reference frame may involve phasors, indicating that it relates to freezing the axis in synchronization with the supply frequency, especially when dealing with multiple frequencies.
  • A participant expresses confusion about the explanation provided, indicating a need for further clarification.
  • Another participant asks if the original poster is familiar with phasors, implying that understanding phasors may be essential to grasping the dq reference frame concept.

Areas of Agreement / Disagreement

The discussion reflects a lack of consensus, as participants express differing levels of understanding and clarity regarding the dq reference frame and its relationship to phasors and frequency synchronization.

Contextual Notes

There are indications of missing assumptions regarding the participants' familiarity with phasors and the specific application of the dq reference frame in VSC systems, which may affect the clarity of the discussion.

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Each VSC station has the same configuration, and its vectorbased equivalent circuit in the synchronous dq reference frame is shown in Fig. 1(b).

Could someone please explain me what doe "dq reference frame" mean?
 

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Is it not just talking in terms of phasors? When you use phasors for AC descriptions, you choose to 'freeze' the axis, synchronous with the supply frequency. This VSC system involves two different frequencies (?) so one side's phasors will rotate slowly around the reference axes of the other side, if they are not synchronised.
 
Hello! Thanks for response. But I am still not clear.
 
Are you familiar with Phasors? (Not the Star Trek ones!)
 

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