A High-frequency Isolated Inverter Against Unbalanced Three-phase Load

A high-frequency inverter, three-phase load technology, which is applied in the direction of converting irreversible DC power input to AC power output, can solve the problem of inability to provide a path for zero-sequence components, and achieve low cost, saving switching devices, and less The effect of capacitance

Active Publication Date: 2016-01-13
SHANDONG UNIV
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  • Summary
  • 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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  • A High-frequency Isolated Inverter Against Unbalanced Three-phase Load

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Embodiment Construction

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

[0019] like 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 connect...

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Abstract

The invention specifically discloses a high-frequency isolated inverter that resists unbalanced three-phase loads, including a DC input circuit, a high-frequency inverter, a high-frequency isolation transformer with dual secondary side windings, a magnetic amplifier rectifier circuit, a DC filter, three-phase bridge inverter and AC filter, the DC input circuit is connected with the high-frequency inverter, the inverter voltage is transformed by the high-frequency isolation transformer of the double-secondary side winding, and the transformed The two voltage output terminals are respectively connected to the input terminals of the magnetic amplifier rectifier circuit, and the output terminals of each magnetic amplifier rectifier circuit are connected to a DC filter, and the DC filter is connected to a three-phase bridge inverter. The three-phase bridge inverter is connected with the AC filter, the capacitors of the two DC filters are connected, and the connection point of the two capacitors is connected with the N point of the AC 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 Patents(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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