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This article deals with protection strategies for meshed HVDC grids, also referred to as MTDC grids. In HVDC systems, a critical clearing time can be defined and can correspond to the duration the substations are able to withstand the fault. If the output DC current reaches the limitation, the VSC-MMC substation trips. The critical clearing time is in the range of several milliseconds. Within this...
Many point to point HVDC lines are already in operation in several countries. However, the development of multiterminal DC grids is slowed by the lack of efficient control and protection strategies that can be applied on such grids. This article deals with the protection aspect of those networks. Indeed, the resort to Voltage Source Converters (VSC) changes the constraints since the short circuit...
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