A Dynamic Blind Spot Index Prediction Method for Distributed Photovoltaic Island Detection

A distributed photovoltaic and island detection technology, applied in the field of distributed photovoltaics, can solve problems such as damage to electrical equipment, threats to the safety of power grid maintenance personnel, and influence on the protection switch action program of the power distribution system, so as to improve reliability and economy, Reasonable level of dynamic blind zone index, avoiding the effect of island detection blind zone phenomenon

Inactive Publication Date: 2017-11-14
STATE GRID CORP OF CHINA +3
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Problems solved by technology

After the island is generated, it will threaten the safety of grid maintenance personnel, affect the protection switch action procedure of the power distribution system, and may cause damage to electrical equipment when reclosing

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  • A Dynamic Blind Spot Index Prediction Method for Distributed Photovoltaic Island Detection
  • A Dynamic Blind Spot Index Prediction Method for Distributed Photovoltaic Island Detection
  • A Dynamic Blind Spot Index Prediction Method for Distributed Photovoltaic Island Detection

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[0028] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples. Those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms are also within the scope of the claims listed in this application.

[0029] Such as figure 1 As shown, the embodiment of the present invention provides a distributed photovoltaic island detection dynamic blind area index prediction method, the steps are as follows:

[0030] Step 1: Establish the time series of the distributed photovoltaic island detection dynamic blind zone index evolution system:

[0031] Measure the 9th harmonic, fundamental voltage frequency, and light intensity of the three-phase voltage at the grid-connected point at fixed time intervals, and divide the difference between the maximum value of the ...

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Abstract

The invention provides a distributed photovoltaic island detection dynamic blind area index prediction method. The method comprises the step of: establishing a time sequence of a distributed photovoltaic island detection dynamic blind area index evolution system; processing time sequence measured data by a non-linear pure-body method; carrying out reflection operation on a target function value of a top point; further carrying out distributed photovoltaic island detection dynamic blind area index prediction and calculation; and obtaining a distributed photovoltaic island detection dynamic blind area index predicted value. By adopting the method, a distributed photovoltaic island detection dynamic blind area index is predicted and calculated according to the monitored parameters, a blind area detection algorithm is adjusted in real time according to a calculation result, an island detection blind area phenomenon is effectively avoided, and the reliability and the economic performance of a photovoltaic power generation system is substantially improved.

Description

technical field [0001] The invention belongs to the field of distributed photovoltaic technologies, and in particular relates to a method for predicting dynamic blind spot index of distributed photovoltaic island detection. Background technique [0002] Islanding detection and anti-islanding protection are protection functions that photovoltaic grid-connected systems must have. The so-called islanding means that when the main grid is in a state of power failure due to failure or maintenance, the distributed generation system may continue to work and communicate with the local The load connection is in independent operation. After the island is generated, it will threaten the safety of grid maintenance personnel, affect the protection switch action procedure of the power distribution system, and may cause damage to electrical equipment when reclosing. Many power generation devices in a distributed photovoltaic power generation system form a complex system. When the distribut...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S50/00G01R31/08G06F19/00
CPCY02E10/50
Inventor 张海宁赵国新李春来杨立滨腾云杨军卢芸
Owner STATE GRID CORP OF CHINA
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