Dynamic performance of current sourced forced commutation HVDC converter with immitance conversion link

This paper proposes to use a forced commutation current sourced converter with immitance conversion link (ICL) for HVDC transmission system. Immitance conversion link can convert the constant current characteristics to the constant voltage characteristics. For HVDC transmission, it is advantageous that the converter is operated in the mode of constant current control to prevent large current in case of the transmission line fault. On the other hand, it is advantageous that ac transmission system is operated in the mode of constant ac voltage control. Therefore, some withdrawal occurs between the HVDC system and the AC system. We investigate using ICL to eliminate this withdrawal. Dynamic behavior of proposed system in fault condition and voltage control is shown by computer simulation.