A Space Vector Suppression Method for Common Mode Voltage of Three-level Photovoltaic Grid-connected Inverter

A technology of voltage space vector and common-mode voltage, which is applied to electrical components, output power conversion devices, and AC power input to DC power output. Amplitude, the effect of increasing the suppression effect

Active Publication Date: 2017-08-25
BEIJING JINGYI RENEWABLE ENERGY ENG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In view of this, an object of the present invention is to propose a space vector suppression method for the common-mode voltage of a three-level photovoltaic grid-connected inverter, to solve the problem in the prior art that the suppression of the leakage current is due to the lack of consideration of the common-mode voltage The effect of changing the frequency on the leakage current affects the suppression effect of the leakage current

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  • A Space Vector Suppression Method for Common Mode Voltage of Three-level Photovoltaic Grid-connected Inverter
  • A Space Vector Suppression Method for Common Mode Voltage of Three-level Photovoltaic Grid-connected Inverter
  • A Space Vector Suppression Method for Common Mode Voltage of Three-level Photovoltaic Grid-connected Inverter

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[0030] The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. These embodiments of the present invention may be referred to herein, individually or collectively, by the term "invention", which is for convenience only and is not intended to automatically limit the application if in fact more than one invention is disclosed The scope is any individual invention or inventive concept.

[0031] Now illustrate in conjunction with accompanying drawing, figure 1 Shown is a flow chart...

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Abstract

The invention provides a space vector suppression method for the common mode voltage of a three-level photovoltaic grid-connected inverter. The method includes the following steps: in the process of synthesizing the output voltage space vector of the inverter, selecting a common mode voltage with a mode length different from one another. Voltage space vectors greater than one-sixth of the input voltage value are synthesized as reference vectors; in the synthesis process of each reference vector, a zero vector is selected as the initial vector; the reference vector is used as the output voltage space vector of the inverter. In this method, a voltage space vector whose mode length is less than or equal to one sixth of the input voltage value is used to synthesize the reference vector, so that the variation amplitude of the common mode voltage is limited within the range of one sixth of the input voltage value. The frequency of change of common mode voltage is effectively reduced, and the leakage current of the inverter is greatly suppressed.

Description

technical field [0001] The invention belongs to the technical field of three-phase three-level inverters, and in particular relates to a space vector suppression method for the common-mode voltage of a three-level photovoltaic grid-connected inverter. Background technique [0002] In order to ensure the safety of use, the VDE 4105 standard has strict restrictions on the common mode current (leakage current) of photovoltaic (Photovoltaic, PV) grid-connected systems. The power frequency isolation transformer on the grid side can realize electrical isolation between PV and power grid, and suppress leakage current. However, power frequency transformers are large in size, heavy in weight, high in cost, and low in system efficiency. If a high-frequency transformer is used to realize the electrical isolation of PV and grid, the system volume, weight and cost can be reduced, but the power conversion is divided into several stages, and the system efficiency has not been significantly...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
Inventor 马亮张犁姜蓓蓓孙琳琳
Owner BEIJING JINGYI RENEWABLE ENERGY ENG
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