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Research on the Model and Control Strategy of One Multi-Module-Converter Based VSC-HVDC

This paper presents a model and control strategy for one multi-module-converter based VSC-HVDC system. Each converter operates with a fairly low switching frequency, and thus it is applicable to select high-power low-switching-frequency and low-conduction-loss electronic devices such as IGCT or GTO in high-power applications. A mathematical model is developed for the overall multi-module-converter based VSC-HVDC system. A controller is also designed systematically for the HVDC system based on the developed system model. Performance of the overall HVDC system and effectiveness of the designed controller are evaluated based on digital time-domain simulations in the MATLAB software environment.