Furthermore, when symmetrical monopolar stations exist in the DC grid, asymmetrical contingencies will also affect its healthy pole. The effects of these contingencies on an HVDC grid are very dependent on the configuration of the HVDC stations and their earthing system. Such stations may suffer contingencies affecting just one pole (asymmetrical contingencies). As a response to the future challenges that power systems will have to face, a gradual growth of present High Voltage Direct Current (HVDC) links is expected, leading to an HVDC supergrid integrating different configurations of HVDC stations.
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