High-frequency AC/AC converter with AC link

A high-frequency AC and converter technology, which is applied in the direction of converting AC power input to AC power output, conversion equipment that can be converted to DC without intermediate conversion, and output power conversion devices. It can solve the problem of complex circuit topology and conversion efficiency. Low, grid harmonic pollution and other issues

Inactive Publication Date: 2002-05-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Because the traditional AC-DC-AC high-frequency link AC / DC / AC converter has three-stage power conversion (low-frequency AC / DC / high-frequency AC / low-frequency AC), unidirectional power flow, complex circuit topology, volume and Due to the shortcomings of heavy weight, low conversion efficiency, and serious harmonic pollution of the power grid, it is imminent to seek AC-AC high-frequency link AC / AC converters (high-frequency AC link AC / AC converters) with excellent comprehensive performance.

Method used

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  • High-frequency AC/AC converter with AC link
  • High-frequency AC/AC converter with AC link
  • High-frequency AC/AC converter with AC link

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Embodiment Construction

[0014] The circuit structure of the voltage source high-frequency AC link AC / AC converter based on the forward converter is composed of an input cycloconverter, a high-frequency transformer, an output cycloconverter, and input and output filter circuits, such as figure 1 shown. Both the input cycloconverter and the output cycloconverter in the circuit structure are composed of four-quadrant high-frequency power switches, which can withstand bidirectional voltage stress and bidirectional current stress. When the power grid transmits power to the load, the input cycloconverter modulates the low-frequency AC into high-frequency AC pulses (inversion mode), and the output cycloconverter demodulates the high-frequency AC pulses into low-frequency AC pulses (rectification mode), The low-frequency sinusoidal AC voltage is obtained after being filtered by the output filter circuit. The input filter circuit can easily make the grid-side current waveform good and the power factor high; ...

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Abstract

An A / A inverter in high frequency AC link belongs to eletric power and electronic inverting technique which includes input cycle inverter, high frequency transformer or high frequency energy accumulation transformer, output cycle inverter as well as input and output filtering circuits. It can invert one kind frequency of AC electricity to another kind current electricity with the same frequency (or diffeent frequency) so that it has the advantages of circuit topology in simple power invertion in two stages, power circuit in double direction, modification of current wave shape at net side and power factor as well as the critical technique established for electronic transformer, sine AC stabilizer and variable frequency power source.

Description

technical field [0001] The high-frequency alternating current link AC / AC (AC / AC) converter involved in the present invention belongs to the power electronic conversion technology. Background technique [0002] A power electronic converter with a high-frequency electrical isolation function between the output load and the input grid is usually called a high-frequency electrical isolation power electronic converter or a high-frequency link power electronic converter. Power electronics researchers have achieved remarkable results in the research of high-frequency link DC / DC converters, high-frequency link AC / DC converters, and high-frequency link DC / AC inverters, resulting in huge changes in power electronic converters. Changes: 1) The electrically isolated DC / DC converter has become lighter; 2) The AC / DC rectifier power supply has developed from the traditional power frequency variable voltage phase-controlled rectifier circuit structure to a high frequency link switching rect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/00H02M5/04
Inventor 陈道炼
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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