Permanent-magnet DC fan cluster system topological structure

Abstract

The invention provides a permanent-magnet DC fan cluster system topological structure, which comprises a plurality of permanent-magnet DC fan parallel branches, wherein each permanent-magnet DC fan parallel branch comprises a plurality of permanent magnet DC fan assemblies connected in parallel. The plurality of permanent-magnet DC fan parallel branches are connected in parallel to form a close-loop structure. Each permanent magnet DC fan assembly outputs a high-voltage direct current. The close-loop structure is provided with a high-voltage DC convergence point. For the defects of complex DC fan series-parallel control and difficult fault processing, magnetic-integration high-frequency transformers and high-frequency high-voltage rectifiers are utilized to solve the problems of high-voltage direct current generated by each DC fan, the multi-fan cluster system topological structure and fault tolerance, thereby preventing the problem of extra electrical insulation due to series connection of the DC fans, and overcoming the problem of fan power distribution and complex voltage stability control due to different wind speeds or fault.

Description

technical field [0001] The present invention relates to the technical field of DC fans, in particular to a cluster system topology structure of permanent magnet DC fans, specifically, a low-voltage multi-module multi-phase permanent magnet generator modular power conversion high-voltage DC fan and its high-voltage DC cluster system structure . Background technique [0002] DC transmission in offshore wind farms has more advantages than AC transmission, so various series-parallel structures of DC fans in offshore wind farms have been proposed. [0003] Existing offshore wind farms usually adopt a series structure of multiple DC fans, such as figure 1 shown. This structure usually has the following defects: [0004] 1. The series connection of DC fans makes the electrical withstand voltage of each DC fan increase in direct proportion to the number of fans in series, and puts forward higher requirements for the electrical insulation of generators and power converters. [00...

AI Technical Summary

Problems solved by technology

[0005] 2. Due to the uneven distribution of wind speed and the same limitation of the series branch current, the outlet voltage of each DC fan in the series branch needs to be adjusted to meet the total voltage balance and power transmission, which makes the control system complex and difficult, and there are wind phenomenon that reduces the utilization of wind resources

[0006] At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

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