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Resonance Phenomena and DC Fault Handling during Intersystem Faults in Hybrid AC/DC Transmission Systems with Partial DC Cabling

In the near future, HVAC and HVDC systems may be routed on the same towers in some applications. These so-called hybrid transmission systems raise several novel challenges, such as AC/DC intersystem faults. Previous investigations focus on the analysis of these faults in purely overhead line based HVDC systems. However, new HVDC corridors might be built as partially cabled systems to increase public acceptance. Intersystem faults in combination with mixed DC overhead and cable transmission systems are a novel challenge for both AC and DC protection systems and are analyzed within this paper. It is shown that even after DC fault current interruption the HVDC system is exposed to significant AC overvoltages and fault currents, which are caused by a resonant behavior of the system. These cannot be cleared by standard DC protection systems. To protect the DC system against intersystem faults the use of a fast earthing concept is proposed.

Author(s):

Philipp Ruffing    
RWTH Aachen University
Germany

Cora Petino    
RWTH Aachen University
Germany

Sven Rüberg    
RWTH Aachen University
Germany

Jose Alfredo Campos Garcia    
TenneT TSO GmbH
Germany

Simon Beckler    
TransnetBW GmbH
Germany

Akos Arnold    
TransnetBW GmbH
Germany

 

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