External parallel time-sharing option switch voltage-type single-stage multi-input non-isolation inverter

Abstract

The invention relates to an external parallel time-sharing option switch voltage-type single-stage multi-input non-isolation inverter, which is formed by connecting a plurality of common-ground inputfilters and one common output filter circuit through a multi-input single-output high-frequency inverter circuit having external parallel time-sharing option four-quadrant 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 filter circuit. The inverter has the advantages of multiple-input-source common ground and time-sharing power supply, output and input non-isolation, sharing the output filter circuit, simple circuit topology, single-stage power conversion, high conversion efficiency, small output voltage ripple and wideapplication prospect and the like, and lays a key technological foundation for a large-capacity distributed power supply system for realizing multiple-new-energy combined power supply.

Description

technical field [0001] The external parallel connection time-division selective switching voltage type single-stage multi-input non-isolated inverter involved in the present invention 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 or without electrical isolation between the output AC load or the AC grid and the input DC power supply are called isolated and non-isolated inverters, respectively. Non-isolated inverters have the characteristics of simple circuit structure, high reliability, large output capacity, and low cost. application value. [0003] New energy sources such as solar energy, wind energy, tidal energy, and geothermal energy (also known as green energy) have the advantages of clean, pollution-free, cheap, reli...

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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