Dc-MMC for the Interconnection of HVDC Grids With Different Line Topologies
IEEE Transactions on Power Delivery(2022)
Abstract
DC-DC converters are needed for the future development of high voltage direct current (HVDC) grids, as they allow to interconnect lines with different voltages and topologies. The dc-dc converters can increase the grid controllability adding power flow control, voltage regulation and/or fault blocking capability. The dc modular multilevel converter (dc-MMC) is a non-isolated solution proposed to interconnect HVDC systems with the same line topology. This paper proposes a new dc-MMC with a control strategy, which allows the converter to interconnect different line topologies (e.g., rigid bipole connected to a symmetric monopole). The paper presents the different line topologies in HVDC installations. Then, a mathematical model with a variable transformation is proposed for the new dc-dc converter. A control structure is proposed and implemented in Matlab/Simulink using an average arm model and simplified dc grids. The results validate the control in normal operation, fault blocking capability and post-fault scenario (degraded mode).
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Key words
Topology,HVDC transmission,Conductors,Circuit faults,DC-DC power converters,Mathematical model,Grounding,DC-DC converter,HVDC,dc-MMC,M2DC,line topology,non-isolated converter
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