Forward five-level inverter

Abstract

The invention discloses a forward five-level inverter, comprising an input direct current power supply, a voltage dividing capacitor, a forward five-level conversion unit, a cycle converter, an output filter and an output alternating current load. Through change of the type of the cycle converter, a circuit topology family of a half-wave rectification forward five-level inverter and a full-wave rectification forward five-level inverter is obtained. The forward five-level inverter provided by the invention has the advantages of few power conversion stages, bidirectional power flow, good output filter front-end voltage spectral characteristic and the like, the conversion efficiency and the power density are improved, the size and the weight are reduced, the voltage stress of a switching device can be reduced, and high-frequency electrical isolation of the alternating current load from the direct current power supply is realized.

Description

technical field [0001] The invention belongs to the technical field of power electronic conversion, in particular to a forward five-level inverter. Background technique [0002] Direct-to-AC (DC-AC) conversion technology refers to a conversion technology that uses power semiconductor devices to convert DC power into constant-voltage and constant-frequency AC power, referred to as inverter technology, which is widely used in national defense, industrial and mining enterprises, Research institutes, university laboratories and daily life. With the development and application of new energy technology, the application of inverter technology in new energy is also increasing. [0003] So far, research on DC-AC converters by power electronics researchers at home and abroad has mainly focused on non-electrically isolated, low-frequency and high-frequency electrically isolated two-level DC-AC converters; for multi-level converters The research mainly focuses on multi-level DC-DC, DC...

AI Technical Summary

Problems solved by technology

It only reduces the voltage stress of the switching tube in the DC / DC converter with high-frequency electrical isolation, but does not really realize multi-level at the front end of the output filter inductor, and does not reduce the voltage stress of the switching tube of the Buck inverter bridge. , the output filter inductor and capacitor values ​​have not been reduced

Moreover, this multi-level topology is proposed on the basis of the unidirectional Buck-type high-frequency link inverter. Due to the inherent defects of the unidirectional Buck-type high-frequency link inverter, this series of high-frequency isolation types are mostly Level topology applications are limited

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