Why 2 capacitors are used at the output side of VSC-HVDC converter and why value of DC capacitor in VSC-HVDC converter is (Vdc/2) in some cases and (2Cdc) in other cases?
Can you provide a URL Link to specific examples.Why 2 capacitors are used at the output side of VSC-HVDC converter and why value of DC capacitor in VSC-HVDC converter is (Vdc/2) in some cases and (2Vdc) in other cases?
@mvas Dear Brother, Many thanks for your reply. I have attached a picture of VSC-HVDC model where 2 capacitors are installed on the output side and the value of each capacitor mentioned here is (2Cdc). I want to know why 2 capacitors are used here instead of 1 capacitor? I also want to know that how the value of each capacitor is (2Cdc) here because in case cases, the value of capacitor is (Udc/2)? Can you kindly explain this?Can you provide a URL Link to specific examples.
VSC-HVDC = Voltage Source Converter - High Voltage DC ?
Are you inquiring about the "Voltage Rating" of the capacitor or the actual Voltage developed across the capacitor?
I assume it has to do with the Topology of the converter
because I would never specify a capacitor with a DC Rating of ( Vdc / 2 )
if Vdc is the voltage expected across that capacitor.
Unless the capacitors are stacked in series,
and Vdc is actually the total voltage across all of the caps in series,
which can be tricky.
Your question is a little too vague and needs more detail.
MMC ( Modular Multilevel Converter ) is a newer & more efficient topology.
@TechWise Dear Brother, Many thanks for your reply. I have attached a picture of VSC-HVDC model where 2 capacitors are installed on the output side and the value of each capacitor mentioned here is (2Cdc). I want to know why 2 capacitors are used here instead of 1 capacitor? I also want to know that how the value of each capacitor is (2Cdc) here because in case cases, the value of capacitor is (Udc/2)? Can you kindly explain this?It's hard to say without seeing a schematic but sometimes the DC side will be shown as two capacitors with Vdc/2 across them as this provides a convenient neutral point for ease of analysis.
It's all a question of how you DEFINE the voltages. I very much doubt that one converter produces twice the output of the other.