A nine-level inverter topology circuit

Abstract

The invention discloses a nine-level inverter topology circuit, which includes two T-type three-level circuits, two switch tubes, and an LC filter circuit; the input power terminals of the two T-type three-level circuits pass through two The two switch tubes are connected, and the LC filter circuit is connected to the center node of the inverter bridge arm of the two T-shaped three-level circuits. The ratio of the input power supply voltages of the two T-shaped three-level circuits is 1. Compared with the traditional multi-level inverter circuit, the nine-level inverter topology circuit of the present invention generates more levels per unit of switch tubes, that is, more levels are generated with fewer switch tubes, and it is convenient to generate multiple levels. The level sinusoidal pulse width modulation waveform simulates the AC output, the output harmonic content is greatly reduced, the volume of the output filter is reduced, the manufacturing cost and material waste of the inverter are greatly reduced, and the efficiency of the inverter is improved.

Description

Technical field [0001] The invention relates to a nine-level inverter topology circuit, which belongs to the technical field of power electronic inverters. Background technique [0002] The inverter is an indispensable power conversion unit in the industrialized society, and the multi-level inverter has always been an extremely important power electronic device, which has been deeply studied and widely used. The multi-level inverter has many advantages such as low output harmonic content, high output level quantity, low voltage or current stress of the device, high efficiency, modularity, good compatibility, etc., making it suitable for photovoltaic power generation, wind power generation, Source filtering, electric vehicles and other fields have been widely used, and it has significant advantages over two-level inverters in medium and high voltage power inverter applications. However, multi-level inverters also have some unavoidable shortcomings. In order to generate more multi...

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Problems solved by technology

However, multi-level inverters also have some unavoidable shortcomings. In order to generate more multi-level inverters, more power switching devices need to be used, which also leads to an increase in the cost of multi-level inverters, which also becomes a constraint The main factor for the development of multi-level inverters; therefore, scholars have proposed various multi-level inverter circuit topologies in the past few years, hoping to use fewer switch tubes to generate more levels

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