T-shaped active clamping type five-level three-phase inverter and grid-connected inversion power generation system

Abstract

The invention relates to a T-shaped active clamping type five-level three-phase inverter. The T-shaped active clamping type five-level three-phase inverter comprises three same T-shaped active clamping type five-level bridge arms, wherein each T-shaped active clamping type five-level bridge arm comprises a first circuit, a second circuit, a third circuit and a clamping capacitor, the first circuit comprises a first power electronic switch tube, a second power electronic switch tube, a third power electronic switch tube and a fourth power electronic switch tube which are connected in series, a first connection point, a second connection point and a third connection point are contained in the first circuit, the second circuit comprises a fifth power electronic switch tube and a sixth power electronic switch tube which are connected in series, the third circuit comprises a seventh power electronic switch tube and an eighth power electronic switch tube which are connected in series, the clamping capacitor is connected between the first connection point and the third connection point, and the second connection point is an output end. By the T-shaped active clamping type five-level three-phase inverter, the input voltage range of the inverter can be expanded, and the performance of the inverter is improved.

Description

technical field [0001] The invention relates to a grid-connected inverter power generation system based on renewable clean energy and a three-phase inverter used in the grid-connected inverter power generation system. Background technique [0002] In recent years, with the increasing severity of the global energy crisis and environmental problems, the development of renewable clean energy (such as solar power, wind power, biomass power generation, etc.) has become the focus of development in various countries. As the interface between renewable energy power generation and loads, the performance of the inverter directly affects the entire renewable energy power generation system. Compared with the two-level inverter, the multi-level inverter has the advantages of low voltage stress of power electronic devices, low total harmonic distortion rate of output waveform, small electromagnetic interference, and small loss. Therefore, multi-level inverters are widely used in renewabl...

AI Technical Summary

Problems solved by technology

With the development of photovoltaic power generation technology, there are currently high-voltage battery panels in the market, making the input voltage of photovoltaic inverters reach 1800V, while the input voltage of conventional T-type three-level three-phase inverters is less than 1000V, which cannot achieve 1800V input voltage

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