High-frequency isolation type inverter for preventing three-phase load unbalance

A high-frequency inverter and three-phase load technology, which is applied in the direction of converting irreversible DC power input into AC power output, can solve the problem of not being able to provide a path for zero-sequence components, and achieve low cost, less capacitance, and energy saving The effect of switching devices

Active Publication Date: 2013-04-24
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are inherent difficulties in the structure of the three-phase bridge converter: since it has only two degrees of freedom, it cannot provide a path for the zero-sequence component

Method used

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  • High-frequency isolation type inverter for preventing three-phase load unbalance

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Embodiment Construction

[0018] The present invention is described in detail below in conjunction with accompanying drawing:

[0019] Such as figure 1 As shown in the figure, a high-frequency isolated inverter against unbalanced three-phase load includes a DC input circuit, a high-frequency inverter, a high-frequency isolation transformer with dual secondary side windings, a rectifier circuit, a DC filter, three Phase bridge inverter and AC filter, the DC input circuit is connected to the high-frequency inverter, the inverter voltage is transformed by the high-frequency isolation transformer of the dual-secondary side winding, and the two voltage outputs after transformation are The terminals are respectively connected to the input terminals of the rectification circuit, and the output terminals of each rectification circuit are connected to the DC filter, and the DC filter is connected to the three-phase bridge inverter, and the three-phase bridge inverter is connected to the The AC filters are conn...

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Abstract

The invention discloses a high-frequency isolation type inverter for preventing three-phase load unbalance. The high-frequency isolation type inverter comprises a direct current input circuit, a high-frequency inverter, a high-frequency isolation transformer with double secondary side windings, a magnetic amplifier rectifying circuit, a direct current filter, a three-phase bridge type inverter and an alternating current filter, wherein the direct current input circuit is connected with the high-frequency inverter; the inversion voltage is transformed through the high-frequency isolation transformer with double secondary side windings; the two voltage output ends subjected to voltage transformation are respectively connected with the input end of the magnetic amplifier rectifying circuit; the output end of each magnetic amplifier rectifying circuit is connected with the direct current filter; the direct current filter is connected with the three-phase bridge type inverter; the three-phase bridge type inverter is connected with the alternating current filter; capacitors of two direct current filters are connected with each other; and the joint of the two capacitors is connected with a point N of the alternating current filter.

Description

technical field [0001] The invention relates to a high-frequency isolation type inverter against unbalanced three-phase load. Background technique [0002] As the main device, DC-DC converters are widely used in photovoltaic inverter systems with high-frequency link structures, and realize maximum power tracking and boost conversion. The converter uses a high-frequency isolation transformer and the inverter side to realize energy transmission. At the same time, the power supply scheme of the dual-secondary side rectifiers in series meets the high voltage requirements of the DC side of the three-phase bridge inverter. Each rectifier can provide its output capacitor However, when the three-phase load of the inverter is seriously unbalanced, the current of the neutral line is relatively large, and the power requirements of the two rectification systems connected in series are different within the power frequency half-wave time, and the midpoint potential balance cannot be guara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
Inventor 张承慧杜春水王生飞陈阿莲
Owner SHANDONG UNIV
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