PROJECT TITLE :

Optimized Design of Full-Bridge Modular Multilevel Converter With Low Energy Storage Requirements for HVDC Transmission Systems - 2017

ABSTRACT:

Modular multilevel converter (MMC) is a well-proved circuit topology in voltage-supply converter-based high voltage direct current (VSC-HVdc) transmission systems. As is known, the conventional [*fr1]-bridge submodule (HBSM)-based mostly MMC-HVdc is not suitable for overhead line transmission applications. In addition, high energy storage requirements, i.e., giant capacitance is inevitable. The standard design of the complete-bridge submodule (FBSM)-primarily based MMC typically will not utilize the negative voltage state of FBSM in normal operation. Considering the same dc voltage as with the HBSM case and utilizing the negative voltage state of the FBSM, this paper presents the planning method of the facility transmission capability of a single FBSM. Meanwhile, an optimized energy storage capacitance design technique of the FBSM is proposed. With this technique, the capacitance of FBSM can be reduced considerably. The correctness and effectiveness of the proposed technique is verified by the simulation of a ±a hundred and sixty kV VSC-HVdc MMC and also the comparison results of the dc short fault blocking and ride through capability are also provided.