Zeta type three-level AC-AC converter

A converter and three-level technology, applied in the direction of converting AC power input to AC power output, electrical components, output power conversion devices, etc., can solve the problems of weak capacity and reduced reliability with different loads, and achieve Improve conversion efficiency and power density, improve reliability, and prevent common-state turn-on and common-state turn-off effects

Inactive Publication Date: 2008-03-26
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The converter has simple topology, single-stage power conversion (low frequency AC LFAC-low frequency AC LFAC), bidirectional power flow, high input side power factor, good output filter front-end voltage spectrum characteristics, high conversion efficiency and power density, suitable for high voltage It has the advantages of large-capacity AC-AC conversion, etc., but it c

Method used

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  • Zeta type three-level AC-AC converter

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Embodiment Construction

[0012] In conjunction with Fig. 1, the Zeta type three-level AC-AC converter of the present invention is composed of an input filter, a multi-level converter and an output filter connected in sequence, and the converter alternately outputs two non-zero levels, and the two Output zero level between two non-zero levels to adjust the width of its output time, and the output three levels are filtered by the output filter to obtain a stable or adjustable same-frequency, high-quality sinusoidal AC voltage u o , that is, the input high-voltage AC power u i One end of the input filter inductor L 4 connected, the input filter inductor L 4 The other end of the input filter capacitor C 4 It is connected to the first ends of the two level mode branches of the multilevel converter, and the input filter inductor L 4 and input filter capacitor C 4 Constitute the input filter, the input filter for the input high-voltage AC power supply u i performing filtering; the two level modal branch...

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Abstract

This invention discloses a Zeta three-level AC-AC converter, which converts a DC Zeta topological single-way switch tube to a dual-way switch tube, adds a supply level mode branch and a dual switch tube isoalting it and adds a zero-level mode dual-switch tube in front of the output filter combined with a non-complementary control strategy, and input and output filters are added to the supply and output ends to make up of a circuir topological structure of stable and adjustable same frequency and high quality sine AC circuit, the power conversion series of this invention is less and dual power flow can be realized, the voltage spectrum character in front of the output filter is good, conversion efficiency and power density are increased, the step regulation can be realized and the volume and weight of the output filter can be reduced and the output waveform quality is increased.

Description

technical field [0001] The invention belongs to power electronic conversion technology, in particular to a Zeta type three-level AC-AC converter. Background technique [0002] AC-AC conversion technology is a conversion technology that uses power semiconductor devices to convert AC power of a certain frequency and amplitude into AC power of the same or another frequency and amplitude. It is widely used in National defense, industrial and mining enterprises, scientific research institutes, university laboratories and daily life. [0003] The traditional AC voltage regulation includes transformer voltage regulation, thyristor voltage regulation, AC chopper voltage regulation and transformation voltage regulation with rectification and inverter intermediate links. Summarize their characteristics. Although each has its own advantages, its defects are also obvious, and the volume is large. , heavy weight, high output harmonic distortion, high voltage borne by the switching tube,...

Claims

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Application Information

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IPC IPC(8): H02M5/257H02M1/12
Inventor 仲庆龙李磊
Owner NANJING UNIV OF SCI & TECH
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