Abstract
Direct-current (DC) grid based on high-voltage direct-current transmission based upon modular multilevel converter (MMC-HVDC) and overhead lines is an effective solution for the wide-area coordination, complementarity and reliable delivery of the large-scale renewable energy sources, and therefore is an important application direction of VSC-HVDC charactered by high voltage and large capacity in the future. Aiming at the challenges of the applicability of the existing modular multilevel converter (MMC) models, such as the low simulation efficiency and accuracy when do the fault characteristic analysis of overhead lines and coordination between the line protection and control systems in DC gird, a general modeling approach for the MMC AVM (AVM) is proposed. As a result, the MMC AVMs based on half bridge submodule (HBSM), full bridge submodule (FBSM), clamped-double submodule (CDSM), hybrid submodule (HSM) and so on can be quickly built without extra difficulties. At the same time, the problem of low simulation efficiency and accuracy which is not high enough for the large-scale MMCs in DC grid is effectively solved. Finally, the precision and applicability of the MMC AVMs constructed with the help of the general modeling method proposed in this paper is verified by PSCAD/EMTDC simulation.
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