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Inversion device and power supply conversion method thereof

An inverter device and power conversion technology, which is applied in high-efficiency power electronic conversion, emergency protection circuit devices, output power conversion devices, etc., can solve the problems of current total harmonic distortion increase and inverter damage, etc., to reduce Effects of Current Total Harmonic Distortion

Active Publication Date: 2015-08-26
SPI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, the output terminal of the grid-connected inverter device will be connected to the grid. When the inverter device fails or is forced to shut down, the mains current will be fed back to the inverter device, which may cause damage to the inverter of the inverter device.
In order to avoid the above situation, the inverter operating in the boundary conduction mode (BCM for short) can be stopped near the zero crossing point. Although this method can effectively prevent the inverter from damage, but the harmonics generated by the stop of the inverter will increase the total harmonic distortion of the current

Method used

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  • Inversion device and power supply conversion method thereof
  • Inversion device and power supply conversion method thereof
  • Inversion device and power supply conversion method thereof

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Embodiment Construction

[0034] figure 1 A schematic diagram showing an inverter device used in a photovoltaic system according to an embodiment of the present invention. Please refer to figure 1 , the inverter device includes an inverter circuit 104, a detection unit 106 and a control unit 108, the inverter circuit 104 is coupled to the photovoltaic module 102, the control unit 108 is coupled to the inverter circuit 104 and the detection unit 106, and the detection unit 106 is coupled to the inverter circuit 104 output. The photovoltaic module 102 can be used to convert sunlight into DC power (including DC voltage VDC and DC current IDC), and the inverter circuit 104 can receive the DC power from the photovoltaic module 102 and convert it into AC power (including AC voltage VAC with alternating current IAC). Furthermore, a switch (not shown) in the inverter circuit 104 can be turned on or off under the control of the control unit 108 , so as to convert the DC power into the AC power. In this embo...

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Abstract

The present invention provides an inversion device and a power supply conversion method thereof. A control unit adjusts a pulse width adjustment signal used for controlling an inversion circuit to perform power supply conversion according to a current harmonic wave component detected by a detection unit, so as to generate a compensation current to be added to an AC current outputted by the inversion circuit.

Description

technical field [0001] The present invention relates to an electronic device, and in particular to an inverter device and a power conversion method thereof. Background technique [0002] An inverter (inverter) is a power conversion device, which usually converts DC input power into AC output power through the switching of power semiconductor elements. Generally, the output terminal of the grid-connected inverter device will be connected to the grid. When the inverter device fails or is forced to shut down, the mains current will be fed back to the inverter device, which may cause damage to the inverter of the inverter device. In order to avoid the above situation, the inverter operating in the boundary conduction mode (BCM for short) can be stopped near the zero crossing point. Although this method can effectively prevent the inverter from damage, but the harmonics generated by the stop of the inverter will increase the total harmonic distortion of the current. Contents o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/44H02M1/12
CPCH02H7/1225H02M1/12H02M1/36H02M7/48H02S50/00H02M1/0003H02M1/0048Y02B70/10Y02E10/56
Inventor 陈汉威游俊豪刘家桦
Owner SPI ELECTRONICS