How does a rectifier work as an inverter in HVDC system?

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Firman Sasongko

It depends on the technology. The line-commutated-converter (LCC)-based HVDC can change the power direction by shifting the firing angle, whereas the voultage-source-converter (VSC)-based HVDC do not need to reverse voltage polarity, only the current need to be changed.

regards.

Mohamed Abdelrahem

In HVDC we used two voltage source converter (VSC) and this VSC can control the power in both directions.

Bhupendra Desai

Basic principle of working are full wave rectifier using center tap transformer and diode bridge, with regular transformer(VSC), with out using center tap .....

Jil Sutaria

Thank you all for the answers.. Rectifier works as an inverter when it's firing angle is greater than 90 degrees..and it has to have a DC load which can act as a source for eg in DC Motor drives..my question is in case of HVDC is that if it is an LCC..than does the DC link act as the source ?

Ahmed H. Okilly

according to firing angle of the converter ....it is can operate as rectifier or inverter .....if the firing angle lower than 90 degree converter station work as rectifier station ......if we increase converter firing angle until it is reached to extinction angle (more than 90 degree) station work as inverter station and the direction of the power reversed.