Electromagnetic Transient Simulation of CIGR´E DC Grid Test System with Hybrid Converter Topologies

Voltage source converter (VSC) based HVDC projects are being increasingly built and operated globally, providing the potential to construct a meshed DC supergrid. The CIGR´E DC grid test system is a benchmark for research and analysis with power system topologies and parameters. This paper presents the electromagnetic transient simulation using detailed switching devices for the complete test system modeling composed of multiple converter topologies, including two-level (2L) converters, three-level neutral-point-clamped (3LNPC) converters, modular multi-level converters (MMCs) with up to 401 levels, and four-quadrant (4Q) DC-DC converters in PSCAD/EMTDC. This paper proposes the scheme to combine the piecewise linearized tangential curve fitting of IGBT and diode characteristics with the Th´evenin equivalence based MMC modeling scheme to increase the accuracy, which can also present the power losses of the IGBT modules. Dynamic analyses, including AC and DC faults, are conducted presenting the results from various converter stations.