Power cable stresses caused by transmission line faults in next generation VSC-MMC systems

The Journal of Engineering

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[1] Institute for High Voltage Technology, RWTH Aachen University, Aachen, Germany;

关键词: HVDC power transmission;    XLPE insulation;    HVDC power convertors;    power overhead lines;    power cable insulation;    fault diagnosis;    power transmission faults;    power transmission lines;    voltage-source convertors;    mixed cable;    overhead line transmission;    diverse fault characteristics;    dynamic fault behaviour;    future cable applications;    system topologies;    MMC setups;    extensive fault;    overhead line segments;    intersystem faults;    identified fault characteristics;    future HVDC systems;    power cable;    transmission line faults;    Modular Multilevel Voltage Source Converters;    cross-linked polyethylene cable transmission;    hybrid AC-DC corridors;    XLPE cable test standards;    complex fault characteristics;    next generation VSC-MMC systems;    power cable stresses;    monopolar configuration;    bipolar configurations;    current stresses;    extensive fault simulation studies;    electromagnetic transient program;    EMTP;    transient stresses;    travelling wave reflections;    high-frequency voltage oscillations;    DC cable stresses;    AC cable stresses;   

DOI  :  10.1049/joe.2018.8628

来源: publisher

【 摘 要 】

Until today, HVDC systems based on Modular Multilevel Voltage Source Converters (VSC-MMC) have exclusively been realised with cross-linked polyethylene (XLPE) cable transmission in monopolar configuration. The next generation of VSC-MMC systems may comprise bipolar configurations, mixed cable and overhead line transmission or hybrid AC/DC corridors. While diverse and more complex fault characteristics are expected in these systems, suitable XLPE cable test standards addressing these impacts are not yet available. Within this work, the dynamic fault behaviour of next generation VSC-MMC systems is analysed to evaluate voltage and current stresses imposed on future cable applications. For this purpose, several system topologies and MMC setups are modelled and extensive fault simulation studies are carried out in an electromagnetic transient program (EMTP). As the results indicate, future cable applications may be exposed to severe transient stresses exceeding existing test levels. In particular, travelling wave reflections at the transitions of cable and overhead line segments may cause high-frequency voltage oscillations with amplitudes of up to −2 pu. Moreover, intersystem faults in hybrid AC/DC corridors may lead to superimposed AC and DC cable stresses. The identified fault characteristics need to be taken into consideration to develop suitable cable test standards for future HVDC systems.

【 授权许可】

CC BY