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Island phenomenon detection method and device and computer readable storage medium

A technology of islanding phenomenon and detection method, applied in the electric power field, can solve the problems of low detection accuracy of islanding phenomenon, achieve the effect of improving grid-connected stability, improving reliability and safety, and reducing disturbance

Active Publication Date: 2019-11-22
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology

[0005] This application provides a method, device and computer-readable storage medium for detecting the islanding phenomenon, which can solve the problem of low detection accuracy of the islanding phenomenon in the related art

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  • Island phenomenon detection method and device and computer readable storage medium
  • Island phenomenon detection method and device and computer readable storage medium
  • Island phenomenon detection method and device and computer readable storage medium

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Embodiment Construction

[0042] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manner of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0043] Before explaining the embodiment of the present application in detail, the system architecture of the embodiment of the present application will be described first.

[0044] figure 1 It is a schematic structural diagram of a grid-connected inverter control system provided in the embodiment of the present application. Such as figure 1 As shown, the grid-connected inverter control system includes a grid-connected inverter, a data sampling unit, a data calculation unit, a control unit and a drive unit. The grid-connected inverter control system can be used in scenarios where grid-connected inverters are used to supply power to the grid, such as large-scale centralized power station scenarios, small and medium-sized distribut...

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Abstract

The invention discloses an island phenomenon detection method and device and a computer readable storage medium, and belongs to the technical field of electric power. The method comprises the following steps: determining a harmonic amplitude growth rate and a frequency growth rate of alternating current output by an alternating current port of a grid-connected inverter; determining an island disturbance coefficient corresponding to the harmonic amplitude growth rate, wherein the harmonic amplitude growth rate and the island disturbance coefficient are in a monotonically increasing relationship; determining island injection amount according to island disturbance coefficients corresponding to the frequency growth rate and the harmonic amplitude growth rate; controlling the grid-connected inverter to output reactive power or reactive current through the alternating current port according to the island injection amount; and carrying out island phenomenon detection according to the frequency of the alternating current output by the alternating current port. According to the invention, whether an island phenomenon occurs can be accurately detected, when the island phenomenon does not occur, the disturbance to a power grid is reduced, the grid-connected stability is improved, when the island phenomenon occurs, the island phenomenon can be rapidly detected, and the detection time is short.

Description

technical field [0001] The present application relates to the field of electric power technology, and in particular to an islanding phenomenon detection method, device and computer-readable storage medium. Background technique [0002] The grid-connected inverter is an important part of the new energy power generation system. It converts the direct current generated by photovoltaic cells, wind turbines and other power generation devices in the new energy power generation system into alternating current and then feeds it to the grid. New energy power generation systems are prone to island phenomenon during operation. The island phenomenon refers to an electrical phenomenon in which the grid-connected inverter continues to supply power to local loads when the power grid is cut off due to faults, maintenance and other problems, and the new energy power generation system is separated from the grid. [0003] The island phenomenon is easy to cause harm to the equipment in the new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02J3/38
CPCG01R31/088H02J3/388H02J3/007H02J3/01
Inventor 于心宇辛凯李俊杰
Owner HUAWEI DIGITAL POWER TECH CO LTD
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