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Cascaded H bridge inverter and fault handling method thereof

A fault handling method and inverter technology, applied in the field of power electronics, can solve problems such as loss of power generation, insufficient redundancy of the number of cascaded H-bridges, etc., and achieve the effect of avoiding major losses and preventing normal and stable work

Active Publication Date: 2016-06-29
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a cascaded H-bridge inverter and its fault handling method to solve the problem of power generation loss caused by insufficient redundancy of the cascaded number of H-bridges in the prior art

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  • Cascaded H bridge inverter and fault handling method thereof
  • Cascaded H bridge inverter and fault handling method thereof
  • Cascaded H bridge inverter and fault handling method thereof

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Embodiment Construction

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] The invention provides a fault handling method for cascaded H-bridge inverters to solve the problem of power generation loss caused by insufficient redundancy of cascaded H-bridges in the prior art.

[0047] Specifically, the fault handling method of the cascaded H-bridge inverter is applied to the cascaded H-bridge inverter, the cascaded H-bridge inverter is connected to N solar panels, and the cascaded H-bridge The inverter includes: N capacitors, N H...

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Abstract

The invention provides a cascaded H bridge inverter and a fault handling method thereof. The fault handing method comprises the steps that a controller detects the output voltages or output powers of N solar cell panels; when the output voltage of the certain solar cell panel is less than a preset voltage or the output power of the same is less than a preset power, the controller controls a corresponding switching device to disconnect, and changes the corresponding direct current side capacitor voltage set value; and then the controller controls the corresponding H bridge module to invert by using the direct current side capacitor voltage set value as the input value, thus the total output modulated voltage of the cascaded H bridge inverter meets a preset condition, the system cannot operate normally and stably is avoided, it ensures that the undamaged solar cell panel can deliver energy to the power grid, and the heavy loss of the generated energy is avoided.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, relates to a cascaded H-bridge inverter and a fault handling method thereof. Background technique [0002] In recent years, cascaded multilevel topology has been widely used for its excellent performance. Among all cascaded multilevel topologies, the cascaded H-bridge topology is favored due to its modular structure, simple layout, fewer components required to achieve the same number of levels, and high system reliability. [0003] The system structure of the current cascaded H-bridge inverter is as follows: figure 1 As shown, under normal working conditions, the solar module is connected in parallel with the DC side of the cascaded H-bridge inverter, and the energy on the DC side is transferred to the grid through the cascaded H-bridge inverter. However, when the solar panel is seriously blocked or fails, the voltage at both ends of the solar panel will drop si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M7/493H02J3/38
CPCH02M7/5387H02M1/007H02J3/381H02J3/48H02J2300/26H02M7/49H02J2300/24Y02E10/56H02M1/0077H02M1/325H02H3/093
Inventor 徐君顾亦磊
Owner SUNGROW POWER SUPPLY CO LTD
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