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Non-isolated photovoltaic inverter common mode resonant loop current and leakage current suppression method

A photovoltaic inverter and resonant ring technology, applied in photovoltaic power generation, high-efficiency power electronic conversion, conversion of AC power input to DC power output, etc., can solve the problems of destroying system stability, increasing system leakage current, and current oscillation, etc. Achieve the effect of good output current waveform quality, output current oscillation suppression, and current suppression effects

Active Publication Date: 2018-09-25
SHANDONG UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common mode resonant loop current causes a series of problems such as inverter side current oscillation, system leakage current increase, system current protection malfunction, etc., which destroys the stability of the system

Method used

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  • Non-isolated photovoltaic inverter common mode resonant loop current and leakage current suppression method

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0038] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...

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Abstract

The invention discloses a non-isolated photovoltaic inverter common mode resonant loop current and leakage current suppression method. A three-phase I-type three-level inverter and an improved LCL filter circuit are included, the capacitor common end of the improved LCL filter circuit is directly connected to a neutral point of a DC-side filter capacitor, the common mode loop of the three-phase I-type three-level inverter is changed, and system leakage current is suppressed. A common mode loop closed loop control algorithm is put forward, a PI controller is added in the common mode loop, and suppression on the common mode resonant loop current is realized. The cost can be saved, the system conversion efficiency is improved, and the practical value is high.

Description

technical field [0001] The invention relates to a non-isolated photovoltaic inverter common-mode resonant loop current and leakage current suppression method. Background technique [0002] In recent years, the rapid growth of photovoltaic power generation has played a huge role in solving the world's energy shortage and environmental pollution problems. In the photovoltaic power generation system, the photovoltaic inverter is the core component, which converts direct current into alternating current. The I-shaped three-phase three-level photovoltaic inverter topology is widely used in medium and high voltage high-power photovoltaic systems. The I-shaped three-level topology has the advantages of lower switching loss, better output waveform quality, and higher energy density and efficiency, making it gradually become the mainstream of the market, attracting the attention of researchers from various countries and widely used in the industry. [0003] However, the parasitic c...

Claims

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Application Information

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IPC IPC(8): H02M1/12H02M7/5387H02M7/483
CPCH02M1/12H02M7/483H02M7/5387H02M1/0038H02M1/123Y02B70/10Y02E10/56
Inventor 张承慧李晓艳邢相洋秦昌伟张洪亮
Owner SHANDONG UNIV
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