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Islanding Detection Method Based on Positive Feedback of Voltage Harmonic Distortion Rate

A voltage harmonic distortion and islanding detection technology, applied in the fault location, single-network parallel feeding arrangement, etc., can solve the problems of destructive islanding detection method and poor identification ability.

Active Publication Date: 2011-12-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0007] In view of the shortcomings of the existing island detection method mentioned in the above background technology, such as destructiveness and poor recognition ability, the present invention proposes an island detection method based on positive feedback of voltage harmonic distortion rate

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  • Islanding Detection Method Based on Positive Feedback of Voltage Harmonic Distortion Rate
  • Islanding Detection Method Based on Positive Feedback of Voltage Harmonic Distortion Rate
  • Islanding Detection Method Based on Positive Feedback of Voltage Harmonic Distortion Rate

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Embodiment Construction

[0064] The preferred embodiments are described in detail below in conjunction with the drawings. It should be emphasized that the following description is only exemplary, and is not intended to limit the scope of the present invention and its application.

[0065] When the microgrid is connected to the grid, since the voltage and frequency of the microgrid are determined by the large grid, the voltage harmonic distortion rate positive feedback loop will not affect the inverter output current frequency, and the grid-connected controller can still operate normally and is running on the grid Under the circumstances, the voltage harmonic distortion rate H is very small, the positive feedback loop has little effect on the inverter output current, and the power quality will not be damaged. When islanding occurs, the inverter control mode does not change, and the microgrid voltage will interact with the inverter output current through a positive feedback loop, which will increase the vo...

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Abstract

The invention discloses an island detecting method based on positive feedback of voltage harmonic distortion in the technical field of a distributed power generating system. In the invention, based on the grid connection control principle of the distributed power generating system, a voltage harmonic distortion positive feedback circuit is additionally arranged, the curve of the voltage harmonic distortion H of a microgrid and the area S surrounded by time shafts are calculated by utilizing a sliding data window, and whether an island is caused is judged according to the magnitude of the areaS. The island detecting method has a simple principle, has no effect on damaging the power quality, can be used for detecting the island quickly and effectively in the worst condition defined in the IEEE Std.1547, is applicable to various types of open circuit conditions, is not interfered by pseudo islands, and has good engineering practicality.

Description

Technical field [0001] The invention belongs to the technical field of distributed power generation systems, and in particular relates to an islanding detection method based on positive feedback of voltage harmonic distortion rate. Background technique [0002] Islanding detection is one of the key issues for flexible control of microgrids. It refers to a miniature self-sufficient power supply network formed by the distributed generation system (DG) that is connected to the grid when the grid fails and is disconnected from the grid and formed with the surrounding loads. Because the distributed power generation system adopts different control modes in grid-connected operation and islanding operation, only the rapid and accurate detection of the islanding operation status can realize the smooth switching of the distributed power generation system control mode. Therefore, islanding detection is very important The practical significance of. [0003] Currently, islanding detection met...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38G01R31/08
Inventor 马静米超王玉慧叶东华许冬彭明法王增平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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