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

In summary, the vector-based equivalent circuit for each VSC station in the synchronous dq reference frame, as shown in Fig. 1(b), is used to describe the alternating current (AC) system. The dq reference frame is chosen to 'freeze' the axis and is synchronous with the supply frequency, but in this VSC system with two different frequencies, one side's phasors will rotate slowly around the reference axes of the other side if they are not synchronized.
  • #1
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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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  • #2
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.
 
  • #3
Hello! Thanks for response. But I am still not clear.
 
  • #4
Are you familiar with Phasors? (Not the Star Trek ones!)
 
  • #5


The "dq reference frame" refers to a specific coordinate system used in vector-based circuit analysis. In this context, it is used to represent the configuration of a VSC (voltage source converter) station, which is a type of power electronic device used in electrical systems. The dq reference frame is a mathematical tool that simplifies the analysis of the circuit by rotating the coordinates to align with the voltage and current vectors. This allows for easier calculation of power and other parameters in the circuit. The figure provided (Fig. 1(b)) shows the vector-based equivalent circuit in this reference frame for each VSC station, which helps to better understand and analyze the behavior of the station in the system.
 

1. What is a DQ reference frame in VSC station?

A DQ reference frame in VSC station refers to the coordinate system used to describe the position and orientation of objects within the station. It is used to establish a common frame of reference for all measurements and calculations.

2. How is the DQ reference frame in VSC station represented in Fig. 1(b)?

In Fig. 1(b), the DQ reference frame is represented by the Cartesian coordinate axes, with the x-axis pointing towards the right, the y-axis pointing upwards, and the z-axis pointing out of the page.

3. Why is the DQ reference frame in VSC station important?

The DQ reference frame is important because it allows for accurate and consistent measurements and calculations within the VSC station. It also enables communication and collaboration between different scientists and researchers working in the same station.

4. How does the DQ reference frame in VSC station differ from other reference frames?

The DQ reference frame in VSC station is specific to the station and is used to describe the position and orientation of objects within it. Other reference frames, such as the global reference frame, may be used to describe the position and orientation of objects in a larger context, such as the Earth's surface.

5. Can the DQ reference frame in VSC station change?

Yes, the DQ reference frame in VSC station can change depending on the needs of the research being conducted. For example, if a different coordinate system is more suitable for a certain experiment, the DQ reference frame can be adjusted accordingly.

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