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Carrier modulation method for correcting zero-sequence component injection

A zero-sequence component, carrier modulation technology, applied in output power conversion devices, AC power input into DC power output, electrical components and other directions, can solve problems affecting the safe and stable operation of the power system, AC side current waveform distortion, power grid injection It can improve power quality, suppress even-order harmonics, and suppress current distortion.

Active Publication Date: 2017-09-08
SHANDONG UNIV
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Problems solved by technology

[0003] However, no matter it is traditional sinusoidal pulse width modulation (SPWM), space vector pulse width modulation (SVPWM) modulation or zero-sequence component injection carrier modulation technology, when the DC voltage is asymmetrical, the current waveform on the AC side will be seriously distorted, giving A large number of harmonics are injected into the power grid, which affects the safe and stable operation of the power system

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] 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.

[0041] 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 carrier modulation method for correcting zero-sequence component injection. The modulation method proposed by the invention is simple and efficient, digitization is easily achieved, the sine degree of a current waveform of an AC-side power grid still can be maintained when a voltage of a bipolar DC bus based on a three-level converter is within a wide asymmetric range, the harmonic component of the power grid current is suppressed, the electric energy quality of the power grid is remarkably improved, high-efficiency and stable running of a bipolar DC bus structure based on the three-level converter is guaranteed, three bus voltage classes are flexibly and controllably generated, complicated and various load types are met, and the application occasions of the three-level transformer and the bipolar DC bus structure are greatly expanded.

Description

technical field [0001] The invention belongs to the field of power electronics, in particular to a carrier modulation method for correcting zero-sequence component injection. Background technique [0002] Three-phase T-type three-level converters have been widely used in photovoltaic power generation, micro-grid and other fields. Especially based on the inherent split capacitance of the three-level converter to generate a bipolar DC bus, it has the advantages of high energy density, simple structure, small size, and low cost, and is more suitable for high-voltage DC transmission, distributed power generation, and micro-grid. , AC and DC conversion places in the field of electric vehicle charging. In order to make the three-level converter with bipolar DC bus structure meet the complex and diverse load types and voltage levels, the research on the asymmetric modulation method of DC bus voltage has become a new trend of domestic and foreign academic hotspots and industrial ap...

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Application Information

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IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 张承慧丁文龙段彬邱涵刘家君
Owner SHANDONG UNIV
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