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Simple detection method for micro-grid island

A technology of island detection and micro-grid, which is applied in the direction of single-network parallel feeding arrangement, measuring electricity, measuring devices, etc., can solve problems such as large blind areas and difficult implementation, and achieve the effect of no detection blind area and fast detection speed

Inactive Publication Date: 2017-06-13
CHONGQING UNIV
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Problems solved by technology

[0006] In view of this, the object of the present invention is a simple microgrid island detection method to solve the problem that the traditional passive island detection has a large blind area, and the traditional scrambling active detection method is difficult to implement

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] The simple microgrid island detection method in this embodiment includes the following steps:

[0019] 1) Detect the voltage amplitude and frequency at the PCC point, if it exceeds the set threshold, it is judged that islanding occurs, otherwise go to step 2);

[0020] 2) Control the energy storage inverter in the microgrid and inject a constant reactive power Q with a small amplitude into the grid h ;

[0021] 3) Detecting the current on the grid side, if the detected current is zero, it is judged that the islanding occurs; if the detected current is not zero, it is judged that the islanding does not occur.

[0022] as attached figure 1 In the typical micro-grid system shown, the common control strategy for the energy storage inverter grid-connected operation is active / reactive power control (i.e. P / Q control), as shown in the attached figu...

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Abstract

The invention discloses a simple detection method for a micro-grid island. The simple detection method comprises the following steps: 1) detecting a voltage amplitude value and frequency on a PCC (Point of Common Coupling), if the voltage amplitude value and the frequency exceed a set threshold value, judging that the island happens, and otherwise, entering 2); 2) controlling an energy storage inverter in the micro-grid, injecting constant reactive power Qh with the smaller amplitude value into the micro-grid; 3) detecting current on a grid side, judging that the island happens if a detection result shows that the current is zero, and judging that the island does not happen if the detection result shows that the current is not zero. According to the simple detection method for the micro-grid island, the energy storage inverter in the micro-grid is controlled, the reactive power with the smaller amplitude value is injected into the grid, grid connected current is detected, and whether the island state happens or not can be quickly and accurately detected through the current detected by the grid side. The method has the advantages of simpleness, easiness in realization, high detection speed and no detection dead zone, and grid quality can not be affected.

Description

technical field [0001] The invention relates to the technical fields of distributed power generation and microgrid, in particular to a detection method for microgrid islands. Background technique [0002] The island operation of the microgrid refers to the state in which the microgrid separates from the large grid and forms a self-sustaining island to supply power to local loads in the grid after the large grid loses power due to failure or other reasons. The unplanned island operation of the microgrid will bring a series of problems to the safe and stable operation of the power system. For example, it affects the normal operation of power equipment and local loads, or even damages them, and endangers the lives of power maintenance personnel. Therefore, it is of great significance to study the islanding detection technology in the microgrid. [0003] The existing islanding detection methods are mainly divided into three categories: passive detection method, active detectio...

Claims

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Application Information

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IPC IPC(8): H02J3/38G01R31/00
CPCG01R31/00H02J3/38H02J3/388
Inventor 陈家伟李想
Owner CHONGQING UNIV
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