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Active island detection method of multi-distributed power supply tied-grid

A technology for distributed power supply and islanding detection, applied in power supply testing and other directions, can solve the problems of weakening the power disturbance effect, difficulty selecting disturbance synchronization, affecting the reliability of islanding detection, etc. The effect of the blind spot

Active Publication Date: 2013-04-24
TIANJIN UNIV
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Problems solved by technology

[0006] Traditional islanding detection methods based on power disturbances face problems such as difficulty in selecting disturbance quantities and disturbance synchronization when facing a system with multiple distributed power sources connected to the grid, which weakens the power disturbance effect and affects the reliability of islanding detection.

Method used

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  • Active island detection method of multi-distributed power supply tied-grid
  • Active island detection method of multi-distributed power supply tied-grid
  • Active island detection method of multi-distributed power supply tied-grid

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Embodiment Construction

[0031] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0032] In order to ensure the effectiveness and sensitivity of the islanding detection method when multiple distributed power sources are connected to the grid and improve the reliability of the islanding detection, an embodiment of the present invention proposes an active islanding detection method for multiple distributed power sources to be connected to the grid, see figure 1 and Figure 5 , the method includes the following steps:

[0033] 101: Detect the voltage frequency of the grid-connected point of the distributed power supply, and judge whether the detection condition is satisfied, if yes, perform step 105; if not, perform step 102;

[0034] After putting into the active islanding detection method based on reactive power disturbance, as lon...

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Abstract

The invention discloses an active island detection method of a multi-distributed power supply tied-grid, and relates to the field of power system relaying protection. Non-detection zones of a traditional passive island detection method are effectively solved through the island detection method based on reactive power disturbance; synchronous starting of multi-distributed power island detection is achieved by using judgment of a harmonic break variable. Island detection with mutual matching of multi-distributed power supplies is achieved, effectiveness and flexibility of the island detection method when the multi-distributed power supply tied-grid operates are guaranteed, and technical support is provided for safe and reliable operations of the multi-distributed power supply tied-grid.

Description

technical field [0001] The invention relates to the field of relay protection of electric power systems. Aiming at the problem of isolated island operation that may occur when distributed power sources are integrated into the power system, an active island detection method suitable for multi-distributed power sources connected to the grid is proposed. Background technique [0002] With the continuous development and application of new energy technologies, distributed power sources are widely connected to the power system, forming a large number of power supply networks with high penetration rate and bidirectional power flow. Once the grid stops supplying power due to misoperation, failure or natural factors, if the grid-connected distributed power supply cannot detect the interruption of the main grid in time and continue to operate, an island operation network that loses the main grid will be formed. [0003] The island operation of distributed power can be divided into pla...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/40
Inventor 李斌范须露宝海龙
Owner TIANJIN UNIV
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