DC power transmission system based on modularized multi-level converter unit

• Main Authors: WU JINLONG, ZHANG JUN, XING DENGJIANG, JIANG WEI, YANG MEIJUAN, WANG XIANWEI
• Format: Patent
• Language: English
• Published: 27.01.2016
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; SYSTEMS FOR STORING ELECTRIC ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention relates to a DC power transmission system based on a modularized multi-level converter unit. The system is formed by M by N MMCs and (M+1) buses, wherein every N MMCs form a unit layer, and M unit layers are formed in total. The N MMCs in each unit layer are connected in parallel between a positive bus and a negative bus. The M unit layers are connected in series successively, and each MMC in every unit layer is connected to the positive bus which is the negative bus connected with the MMCs in the previous unit layer. The intersecting redundant structure of the system solves the problem of poor fault-tolerant capability of the system.