System security of hybrid AC-HVDC-systems challenges and new approaches for combined security assessment, preventive optimization and curative actions

摘要

The intense application of Voltage Source Converter based HVDC interconnections and grids will result in a hybrid AC-HVDC-system.The operation of such a system becomes complex regarding system secudty and system operation.This paper describes major challenges and proposes potential solutions,including a combined security assessment,preventive optimization and curative actions.A coordination of both systems enables an efficient application of existing transport capacity.