External parallel time-sharing selection switch voltage-type monopole multi-input low-frequency link inverter

Abstract

The invention relates to an external parallel time-sharing selection switch voltage-type monopole multi-input low-frequency link inverter. A circuit structure is formed by connecting a plurality of input filters which are in common ground and a shared output low-frequency isolation transformation filtering circuit through a multi-input and single-output high-frequency inversion circuit of an external parallel time-sharing selection four-quadrant power switch, each input end of the multi-input and single-output high-frequency inversion circuit is connected with an output end of each input filter in one-to-one correspondence, and an output end of the multi-input and single-output high-frequency inversion circuit is connected with an input end of the output low-frequency isolation transformation filtering circuit. The inverter has the characteristics of divided power supply, simple circuit topology, monopole power conversion, high conversion efficiency, small output voltage ripple, wide application prospect and the like, multiple input sources are in common ground, an output and an input are in low-frequency isolation, the output low-frequency transformation filtering circuit is shared, and a key technology is laid for a large-capacity distributed power supply system for achieving combined power supply of various new energy sources.

Description

technical field [0001] The external parallel connection time-division selective switching voltage type single-stage multi-input low-frequency link 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 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) real...

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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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