An Island Detection Method Based on System Identification

A technology of island detection and system identification, applied in fault location and other directions, can solve the problems of high input cost and complicated operation, and achieve the effect of improving quality, avoiding harmonic pollution and reliable detection.

Active Publication Date: 2018-06-05
ZHEJIANG UNIV CITY COLLEGE
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Problems solved by technology

However, equipment with higher configuration is required, the operation is more complicated, and the investment cost is high.

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  • An Island Detection Method Based on System Identification
  • An Island Detection Method Based on System Identification
  • An Island Detection Method Based on System Identification

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Embodiment Construction

[0034] The following is a detailed description of an island detection method based on system identification provided by the present invention with reference to the drawings and embodiments.

[0035] The present invention is mainly applied to a distributed power generation system, in which a direct current source is incorporated into the power grid through an inverter system and provides electrical energy to local loads. The digital controller is used to control the current and voltage of the inverter system.

[0036] An island detection method based on system identification of the present invention includes the following steps:

[0037] S1. Obtain the voltage signal and output current signal at the PCC of the common coupling point between the power generation system of the distributed power generation system and the power grid;

[0038] S2. Remove the fundamental wave of the acquired voltage signal and current signal through a band stop filter to obtain the harmonic components U and I...

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Abstract

A distributed generation (DG) system and a micro power grid have great advantages in utilization of clean energy yet also face numerous problems. Detection of an island effect represents the key link in control over the DG system. The island effect refers to a situation when, due to such factors as a fault in the DG system or maintenance and the like, a large power grid is cut off or stops working, grid-connected equipment does not effectively detect a power failure state and disconnect DG equipment from the large power grid but still supplies energy to a local load. A conventional island detection technology can be divided into a passive detection method, an active detection method and a remote detection method. Compared to the prior art, the method provided by the invention has the following advantages: an island event is rapidly, accurately and reliably detected, the defect of a blind area existing by use of the passive method is effectively avoided, at the same time, injection of certain disturbance signals in a power network is unnecessary, the quality of output electric energy of the generation system is improved, and harmonic wave pollution is prevented.

Description

Technical field [0001] The invention relates to the field of distributed power generation systems, in particular to an island detection method based on system identification. Background technique [0002] In recent years, with the continuous development of industry and excessive reliance on fossil energy, problems such as environmental pollution and serious resource consumption have become increasingly prominent. Compared with fossil energy, solar energy, wind energy, hydrogen energy and other renewable energy can be restored and supplemented after consumption, and produce no or very few pollutants, so it is regarded as a type of clean energy. In the use of clean energy, the distributed generation system DG (Distributed Generation) plays an important role. DG refers to the realization of economical, efficient and reliable power generation through small-scale power generation facilities distributed near the load. Currently, most DGs use green energy such as wind, solar and water...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 李艳君柳诗涵王雪洁潘树文
Owner ZHEJIANG UNIV CITY COLLEGE
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