HVDC - Current Source Converter - Minimum DC Power flow

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Discussion Overview

The discussion revolves around the differences between Current Source Converters (CSC) and Voltage Source Converters (VSC), specifically focusing on the minimum DC power flow requirement for CSCs, which is noted to be 5-10%. Participants are exploring the implications of this requirement and its relation to the technology involved, particularly the role of thyristors.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • mk raises a question about the minimum DC power flow requirement for Current Source Converters and its comparison to Voltage Source Converters, suggesting it may relate to the use of thyristors.
  • Another participant expresses confusion about mk's initial inquiry, indicating a lack of clarity regarding the topic.
  • mk provides a reference to an article that discusses the differences between LCC and VSC technologies, specifically mentioning a table that outlines the minimum DC power flow requirement for LCCs.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there is confusion about the initial question and a lack of responses to clarify the topic further.

Contextual Notes

The discussion lacks detailed technical explanations regarding the underlying reasons for the minimum DC power flow requirement and how it relates to the components used in Current Source Converters.

micuklein
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Hello,

I was reading about the differences between Current Source Converters and Voltage source converters.
One main difference was that Current source converters need to have a minimum DC power flow of 5-10% while VSC do not have a min flow requirement. It was also called a deadband.
Why is this? Does it have to do with the thyristors? If so, how?

Thanks!

Regards,

mk.
 
Engineering news on Phys.org
No opinions?

Thanks!
 
We have no real idea what you're talking about.

How about pasting in the paragraph that confused you ?
 
Hi Jim,

This is the article I was reading on the technological differences between different types of DC/AC convertors( LCC vs. VSC ).
www2.nationalgrid.com/WorkArea/DownloadAsset.aspx?id=13784
There is a table on page 3 that compares the 2 technologies side by side.
At Minimium DC Power, it is said that the LCC requires a flow of at least 5-10% of the rated power.
I am trying to understand why this is the case.
 

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