Abstract
This article highlights some of the key technical issues associated with the connection of large modern nuclear power plants (NPPs) to the national electricity transmission system via high-voltage direct current (HVDC) technology. The importance of the electricity system for such a connection is described. The need for reliable and secure supplies from the electricity grid to power the safety systems of the NPP is also discussed. Simulations carried out on the power system computer-aided design have highlighted the susceptibility of HVDC current source converter technology to commutation failure under a three-phase fault condition at the inverter when connected to a weak ac system. The work has also demonstrated the fault ride through the capability of the voltage source converter technology for the same scenario.
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