Variable-topology Trans-Z-source inverter

Abstract

The invention discloses a variable-topology Trans-Z-source inverter, which comprises a first Trans-Z-source network, a second Trans-Z-source network, a first DC power source, a second DC power source, a first full-bridge inverter, a second full-bridge inverter, a first filtering inductor, a first AC power source, a ninth switch tube, a tenth switch tube, a ninth diode and a tenth diode. The first Trans-Z-source network is connected in parallel between the first full-bridge inverter and the first DC power source; the second Trans-Z-source network is connected in parallel between the second full-bridge inverter and the second DC power source; and the first DC power source and the second DC power source are connected through the ninth switch tube, the ninth diode, the tenth switch tube and the tenth diode. The Trans-Z-source inverter can eliminate dead zones, realizes single-stage boosting, realizes any multiple of boosting under the condition of small shoot-through duty ratio, can realize switching of two modals and realizes improvement of efficiency.

Description

technical field [0001] The invention belongs to the field of inverter technology, and relates to a variable topology Trans-Z source inverter. Background technique [0002] At present, the storage capacity of traditional fossil energy is gradually decreasing, and it will be exhausted in the near future, and traditional energy has serious pollution problems, so the research on new energy is of great significance. In the new energy industry, solar energy, wind energy and other industries are developing rapidly, and the development of new energy has to involve the DC-AC link, and the conversion device used in this link is the inverter. Therefore, the research on the inverter has attracted the attention of many experts and scholars at home and abroad, among which the topology is one of the research hotspots. The research on topology can not only improve the efficiency, but also reduce the cost, which has a great influence on the promotion of photovoltaic power generation system ...

AI Technical Summary

Problems solved by technology

[0003] However, there are more or less problems in the traditional voltage inverter, such as: the inverter bridge is not allowed to pass through the upper and lower bridges, so a dead zone has to be added in the modulation process. If the dead zone time is too short, the upper and lower bridges may be damaged due to external interference. The switch tube is burnt through through, and the dead time is too long, which will affect the power quality; the traditional inverter cannot realize the single-stage boost function, so it is necessary to add a boost module before the DC-AC, but this will increase the occupied space and increase the cost. Reduces efficiency and increases system control difficulty

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