A Medium-Voltage Three-Port Flexible Multi-State Switching Topology Based on Power Electronic Transformer

Abstract

The invention discloses a flexible medium-pressure three-port multi-state switch topology based on power electronic transformers. The topology comprises a first series-wound output level, a second series-wound output level, a third series-wound output level, a high-frequency isolation level X, and a high-frequency isolation level Y; each series-wound output level comprises three phases, and each phase is composed of N series-wound single-phase AC-DC converters; each high-frequency isolation level includes 3N two-port high-frequency transformers and 6N single-phase AC-DC converters. The first series-wound output level is linked with the third series-wound output level through the high-frequency isolation X, and the second series-wound output level is linked with the third series-wound output level through the high-frequency isolation Y. The flexible medium-pressure three-port multi-state switch topology based on the power electronic transformers can achieve the interconnection and power flow control of three medium-pressure alternating-current distribution lines, and replace or even surpass the functions of traditional mechanical interconnection switches. A simulation result verifies the validity of the topology, thereby providing the engineering application with a great reference price.

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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