Equivalent Electromagnetic Transient Simulation Model and Fast Recovery Control of Overhead VSC-HVDC Based on SB-MMC - 2017


Self-blocking modular multilevel converter (SB-MMC) is able to dam dc fault current with relatively lower number of power semiconductors and lower valve power loss compared to different dc fault tolerant MMC topologies. Operating principle, style, reliability, and redundancy analysis of SB-MMC have been studied whereas the equivalent modeling and application of SB-MMC at overhead VSC-HVDC haven't been fully investigated. Since operating principle of SB-MMC is totally different from 0.5-bridge MMC, the prevailing equivalent modeling method of 0.5-bridge MMC can't be directly applied to modeling of SB-MMC. As dc fault at overhead VSC-HVDC are usually temporary, a way to securely and quickly restart a VSC-HVDC after isolating dc fault conjointly wants detailed studies. To solve the on top of 2 challenges, an equivalent model (EM) and a quick recovery control of overhead VSC-HVDC based mostly on SB-MMC are proposed. Accuracy of the proposed model is verified by intensive simulations in PSCAD/EMTDC. The proposed quick recovery control additional exploits the control capability of SB-MMC and permits fast and secure recovery of overhead VSC-HVDC based mostly on SB-MMC. The proposed model and controllers conjointly offer steerage for the modeling and application of other MMC topologies that are in a position to dam dc fault current.

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