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

AI Thread Summary
The discussion focuses on the concept of the "dq reference frame" in the context of Voltage Source Converter (VSC) stations. It clarifies that the dq reference frame is used to simplify the analysis of AC systems by transforming them into a rotating reference frame, which is synchronized with the supply frequency. Participants note that in a VSC system with two different frequencies, the phasors can rotate at different rates if not synchronized. This leads to complexities in understanding the interactions between the two sides of the system. Overall, the dq reference frame is essential for analyzing the dynamics of VSC stations effectively.
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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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