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Non-isolated modularization three-level parallel inverter and control method thereof and control system thereof

A technology of three-level inverter and control method, which is applied in the direction of electrical components, photovoltaic power generation, circuit devices, etc., can solve the problems of increasing system loss and volume, reducing system efficiency, etc., and achieves cost saving, high practical value, and improved The effect of conversion efficiency and safety stability

Inactive Publication Date: 2019-02-01
SHANDONG UNIV
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  • Application Information

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Problems solved by technology

However, the use of auxiliary devices will increase the loss and volume of the system and reduce the efficiency of the system

Method used

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  • Non-isolated modularization three-level parallel inverter and control method thereof and control system thereof
  • Non-isolated modularization three-level parallel inverter and control method thereof and control system thereof
  • Non-isolated modularization three-level parallel inverter and control method thereof and control system thereof

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[0058] It should be pointed out that the following detailed descriptions are all illustrative and are intended to provide further explanations for the application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0059] It should be noted that the terms used here are only for describing specific implementations, and are not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate There are features, steps, operations, devices, components, and / or combinations thereof.

[0060] The invention relates to a method for suppressing common mod...

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Abstract

The present invention discloses a non-isolated modularization three-level parallel inverter and a control method thereof and a control system thereof so as to achieve inhibition of a common mode resonance current, a ring current and a leak current. According to the non-isolated modularization three-level parallel inverter, a main control is arranged to I-shaped three-level inverter modularizationparallel, a filter is an improved LCL filter which changes a common mode loop structure to achieve inhibition of the high-frequency ring current and the leakage current. In order to inhibit the commonmode resonance caused by the improved LCL filter, the common mode loop is provided with an active controller to achieve inhibition of the common mode resonance current. The non-isolated modularization three-level parallel inverter further achieve the low-frequency ring current inhibition, the balance control of a neutral-point voltage at a direct current side and current tracking and the resonance inhibition of a difference module loop.

Description

Technical field [0001] The invention belongs to the field of power electronic control, and relates to a non-isolated modular three-level parallel inverter, a control method and a system. Background technique [0002] In order to solve the energy crisis and environmental pollution problems, new energy power generation has received more and more attention. In the new energy power generation, photovoltaic power generation has the advantages of low carbon, environmental protection and low cost, becoming one of the only energy sources in the world in the future and has been vigorously developed. With the increase of photovoltaic power levels, the I-shaped three-level inverter modular parallel system is widely used by providing high-quality large current. However, the modular parallel connection of inverters will cause circulating current. At the same time, in a non-isolated photovoltaic system, leakage current is unavoidable due to the existence of parasitic capacitance. Circulatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5395H02J3/38
CPCH02J3/383H02M7/5395Y02E10/56
Inventor 张承慧李晓艳邢相洋秦昌伟
Owner SHANDONG UNIV
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