HVDC - Current Source Converter - Minimum DC Power flow

[micuklein]

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.

 

[micuklein]

No opinions?

Thanks!

 

[jim hardy]

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

How about pasting in the paragraph that confused you ?

 

[micuklein]

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.