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A Hybrid Island Detection Method Based on Active and Passive Combination

An island detection and hybrid technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as the impact of power quality in the power grid, and achieve the effect of improving blind spots, reducing impact, and small possibility.

Active Publication Date: 2018-05-04
SOUTHEAST UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

Compared with the passive method, the active method can greatly reduce or even eliminate the dead zone, but it will have an impact on the power quality of the grid

Method used

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  • A Hybrid Island Detection Method Based on Active and Passive Combination
  • A Hybrid Island Detection Method Based on Active and Passive Combination
  • A Hybrid Island Detection Method Based on Active and Passive Combination

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Embodiment Construction

[0033] Below in conjunction with the accompanying drawings and specific embodiments, the present invention will be further clarified. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. Modifications of equivalent forms all fall within the scope defined by the appended claims of this application.

[0034] like figure 1 As shown, the distributed power generation system in this embodiment can be regarded as a constant current source. In order to achieve the maximum output power and minimize the internal losses of the system, the distributed generation system operates in a unity power factor mode. When the power grid is disconnected, the distributed generation system will continue to supply power to the RLC. Since the constant current mode is adopted, the output current value of the DG is unchanged. The output power of the DG is P+jQ, the power supplied by the grid is ΔP+jΔQ, and t...

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Abstract

The invention discloses a hybrid island detection method combining active and passive methods. The invention calculates the output active power P of the DG system by collecting data, and the active power P+ΔP and reactive power ΔQ consumed by the load are selected and detected by the passive blind zone criterion. In the method, within the blind zone criterion, the SFS detection method without blind zone is adopted; outside the blind zone, the over / under voltage and over / under frequency device detection method is adopted, which can improve the shortcomings of the passive method with large blind zone, and realize the detection without blind zone; and Since the possibility that the local load is in the passive blind zone is small in actual operation, the influence of the detection method on the power quality can be greatly reduced.

Description

technical field [0001] The invention relates to a hybrid island detection method combining active and passive combination, belonging to the field of island protection for grid-connected distributed power generation systems. Background technique [0002] "Island" refers to the existence of distributed generation (DG) (connected to the power grid and transmits power) after the public power grid stops supplying power, so that some lines in the power grid blackout area remain live, forming an island of self-sufficient power supply. Unplanned island operation may cause serious damage to users and distribution equipment. Therefore, when photovoltaic power generation and other distributed generation systems are connected to the public grid, island detection is an essential and important function. There are two main types of island detection methods at home and abroad: the local island detection method and the remote communication-based island detection method. The method based on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 蒋平高蕾吴熙冯双
Owner SOUTHEAST UNIV
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