Modularized medium voltage three-port flexible multi-state switch topology

Abstract

The invention discloses a modularized medium voltage three-port flexible multi-state switch topology. The topology of a flexible multi-state switch is composed of two voltage reduction input stages and one series connection output stage, wherein each voltage reduction input stages comprises one multi-winding voltage reduction transformer and 3N three-phase AC-DC converters; the series connection output stage comprises three phases, and each phase comprises N single-phase AC-DC converters; all AC-DC converters of the two voltage reduction input stages and the series connection output stage are in back-to-back connection on a direct current bus capacitor. The modularized medium voltage three-port flexible multi-state switch topology can achieve flow control over interconnection and power in the three medium voltage distribution lines, and can substitute and surpass a function of a traditional mechanical interconnection switch. A simulation result verifies the effectiveness of the topology, and good reference value is provided for engineering application.

Description

technical field [0001] The invention belongs to the field of flexible multi-state switches, and relates to a novel modular, medium-voltage, three-port flexible multi-state switch topology. Background technique [0002] In the future smart distribution network, the widespread access to distributed power sources will aggravate the uncertainty of system operation and bring about a series of problems, such as voltage crossing and line overloading. These problems prompt the real-time network reconfiguration and active power management of the distribution network. At present, the network reconfiguration of the distribution network mainly relies on traditional mechanical contact switches. Due to the limitations of switching loss and inrush current, traditional mechanical switches cannot be frequently disconnected, which limits the real-time performance of distribution network reconfiguration, making it difficult to Meet the needs of the future smart distribution network. [0003]...

AI Technical Summary

Problems solved by technology

Under different voltage levels, power levels, and port numbers, the specific topology that flexible multi-state switches can adopt and the pros and cons of different topologies are still a research blank.

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