Design of topological structure of LCC-MMC hybrid direct current deicing device

• Main Authors: ZHU XUDONG, JU XIANG, LIAO JIRUI, TIAN YE, ZHANG SHAOWEI, NING XIAN'EN, HONG DINGDING, ZHANG WENYUAN, YUAN HUQIANG, YUAN YISHENG, YANG TAO, YAN KANG, HAN JIANWEI, LYU TAO
• Format: Patent
• Language: Chinese; English
• Published: 26.08.2022
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINEDOPTICAL AND ELECTRIC CABLES OR LINES; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention relates to a design of a topological structure of an LCC-MMC hybrid direct-current ice melting device, and belongs to the technical field of direct-current ice melting. Firstly, a hybrid direct current deicing device composed of a power grid commutation converter and a modular multi-level converter is provided, wherein the MMC converter adopts a full-bridge and half-bridge sub-module hybrid structure; secondly, according to different line lengths and icing working condition requirements, a switching scheme and a coordination control strategy of working modes of the direct-current ice melting device are designed, and meanwhile, a multiplexing function mode for improving the utilization rate of the device is designed; according to the invention, the topological structure of the hybrid ice melting technology is improved to solve the problems of minimum power limitation in the operation process of the LCC ice melting device, current interruption and relatively large harmonic proportion when small cu