HVDC - Current Source Converter - Minimum DC Power flow

AI Thread Summary
Current Source Converters (CSCs) require a minimum DC power flow of 5-10%, known as a deadband, while Voltage Source Converters (VSCs) do not have such a requirement. This difference is attributed to the operational characteristics of thyristors used in CSCs, which necessitate a continuous current flow to maintain stable operation. The discussion references a comparison table from an article detailing the technological differences between CSCs and VSCs. Understanding the minimum power flow requirement is crucial for effective application in DC/AC conversion systems. The inquiry aims to clarify the underlying reasons for this operational requirement.
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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