A nine-level inverter

An inverter, nine-level technology, applied in electrical components, AC power input into DC power output, output power conversion devices, etc., can solve the problem of damage to output power quality, low efficiency, and reduce inverter work efficiency And other issues

Active Publication Date: 2016-05-25
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the parasitic capacitance of the DC power supply (such as solar panels) to the ground, there may be a problem of leakage current when the inverter is working.
The leakage current problem will not only damage the output power quality and reduce the working efficiency of the inverte

Method used

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  • A nine-level inverter
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Embodiment Construction

[0094] When the inverter is working, there may be a power frequency or high frequency jump voltage of the DC power supply relative to the output negative pole (equal potential with the ground), and due to the existence of the parasitic capacitance of the DC power supply (such as a solar panel) to the ground, it may cause There will be a leakage current problem. The leakage current problem will not only damage the output power quality and reduce the working efficiency of the inverter, but also cause harm to the human body and reduce the reliability of the inverter. For example, figure 1 It is an existing five-level inverter. When the inverter is working, there will be a power frequency jump at the DC power supply DC relative to the output negative pole, that is, at point C. It can also be said to be at the midpoint of the bus, that is, the capacitor There is a power frequency jump between the common terminal of C1 and capacitor C2, or the DC negative pole of the DC power suppl...

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Abstract

The invention provides a nine-level inverter, which comprises two direct current boosting circuits, eight switch tubes, two inductors, six capacitance units and four anti-countercurrent devices, wherein the public end of the fifth capacitance unit and the sixth capacitance unit is connected with the public end of the first capacitance unit and the second capacitance unit; the fifth capacitance unit and the sixth capacitance unit are output filter circuits of the inverter; the public end of the first capacitance unit and the second capacitance unit is the midpoint of a direct current bus. Known from above, in the inverter, the potential of the midpoint of the direct current bus (or the anode or cathode of a direct current power supply) is more than those of the midpoints of the output filter circuits, and the anode or cathode of the direct current bus is not subjected to a leaping voltage with work frequency or high frequency relative to the ground, so the problem of leak current is avoided. In addition, the efficiency is higher due to the nine-level output and the nine-level inverter is suitable for the application fields such as photovoltaic generating.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a nine-level inverter. Background technique [0002] Inverters are used to convert the DC voltage output by the DC power supply into AC voltage, and are widely used in photovoltaic, wind power generation and other fields. However, due to the existence of the parasitic capacitance of the DC power supply (such as a solar panel) to the ground, there may be a problem of leakage current when the inverter is working. The leakage current problem will not only damage the output power quality and reduce the working efficiency of the inverter, but also cause harm to the human body and reduce the reliability of the inverter. [0003] At present, in order to solve the problem of leakage current, inverters with topologies such as H5, H6, and HERIC have appeared, but these inverters are all three-level inverters, so the efficiency is low. Compared with the three-level inverter, the...

Claims

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Application Information

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IPC IPC(8): H02M7/483
Inventor 薛丽英张彦虎胡兵周灵兵
Owner SUNGROW POWER SUPPLY CO LTD
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