Series-connection simultaneous-selection switching voltage type single-stage multiple-input low-frequency link inverter

Abstract

The invention relates to a series-connection simultaneous-selection switching voltage type single-stage multiple-input low-frequency link inverter, which is formed by connecting a plurality of not-common-ground input filters and one common output low-frequency isolation transformer filter circuit through a multi-input single-output high-frequency inverter circuit having series-connection simultaneous-selection power switches. The input ends of the multi-input single-output high-frequency inverter circuit are in one-to-one correspondence connection with output ends of the input filters respectively; and the output end of the multi-input single-output high-frequency inverter circuit is connected with the input end of the output low-frequency isolation transformer filter circuit. The inverterhas the advantages of multiple-input-source not common ground, simultaneous or time-sharing power supply, output and input low-frequency isolation, common output low-frequency isolation transformer filter circuit, simple circuit topology, single-stage power conversion, high conversion efficiency, small output voltage ripple and wide application prospect and the like, and lays a key technologicalfoundation for a large-capacity distributed power supply system for realizing multiple-new-energy combined power supply.

Description

technical field [0001] The invention relates to a series-selected switch voltage type single-stage multi-input low-frequency link inverter, which belongs to the power electronic conversion technology. Background technique [0002] The inverter is a static converter device that uses power semiconductor devices to convert an unstable and inferior DC power into a stable and high-quality AC power for AC loads or AC grid connection. Inverters with low-frequency electrical isolation or high-frequency electrical isolation between the output AC load or the AC grid and the input DC power supply are called low-frequency link and high-frequency link inverters, respectively. The electrical isolation components mainly play the following roles in the inverter: (1) realize the electrical isolation between the output and input of the inverter, and improve the safety, reliability and electromagnetic compatibility of the inverter operation; (2) realize The matching between the inverter outpu...

AI Technical Summary

Problems solved by technology

The distributed power generation system realizes multiple input sources simultaneously supplying power to loads and prioritizing the utilization of energy, which improves the stability and flexibility of the system, but there are defects such as two-stage power conversion, low power density, low conversion efficiency, and high cost. Its practicality is limited to a large extent

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