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Method and device for detecting islanding effect

An islanding effect and corresponding technology, applied in the field of power supply, can solve the problems of inability to detect, misjudgment, etc., to shorten the detection time, improve the detection efficiency, and improve the detection accuracy.

Active Publication Date: 2014-03-26
EAST GRP CO LTD
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to propose a method and device for detecting the islanding effect, so as to solve the problems of misjudgment and inability to detect the existing methods for detecting the islanding effect

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  • Method and device for detecting islanding effect
  • Method and device for detecting islanding effect

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Embodiment Construction

[0024] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0025] figure 1 It is a flowchart of a method for detecting an islanding effect provided by an embodiment of the present invention. Such as figure 1 As shown, the method for detecting the islanding effect includes: Step 11 to Step 13.

[0026] In step 11, the impedance of multiple harmonics is obtained according to the voltage value and current value output by the AC output terminal of the current inverter of the grid under test, as a basis for whether the islanding effect occurs in the grid under test.

[0027] For example, according to the voltage value and current value output by the AC output terminal of the current inverter of the grid under test, the impedance of the 2nd harmonic to the impedance of the 11th harmonic is obtained, a total of 10 impedances. For another example, according to t...

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Abstract

The invention discloses a method and a device for detecting an islanding effect. The method comprises the steps: acquiring impedances of multiple harmonics according to voltage and current values currently output from an alternating-current output terminal of an inverter of a detected power grid; judging whether the detected power grid is subjected to the islanding effect or not currently according to the degree of association between each harmonic impedance in the impedances of the multiple harmonics and a corresponding harmonic impedance range in a preset first harmonic group, wherein the preset first harmonic group corresponds to the multiple harmonics and is multiple harmonics, which are generated by an output terminal when the detected power grid is subjected to the islanding effect. According to the method, whether the power grid is subjected to the islanding effect or not is not required to be judged through the variation of voltage and frequency, so that the problems of misjudgment and undetectability in the existing islanding effect detection methods are solved, and the accuracy of islanding effect detection is improved.

Description

technical field [0001] The invention relates to power supply technology, in particular to a method and device for detecting islanding effect. Background technique [0002] In grid-connected power generation systems such as photovoltaic power generation, wind power generation, and fuel cell power generation, when the grid power supply is tripped due to a fault accident or power outage maintenance, it cannot detect the power outage state immediately and cut itself off from the mains network, resulting in a The grid-connected power generation system of the distributed power station and the surrounding loads form a self-sufficient power supply island, that is, the island effect. [0003] Once the island is generated, it will endanger the safety of the maintenance personnel on the grid transmission line, affect the action program of the protection switch on the power distribution system, and impact the grid protection device, etc. Therefore, it is necessary to be able to detect t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 苏建徽孙博徐海波汪海宁
Owner EAST GRP CO LTD
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