Networked microgrid asymmetrical fault area detection device and diagnosis method

A technology of fault area and detection device, applied in the field of power grid system, can solve the problem of inability to diagnose faults in the main grid of the microgrid or in the liaison area, and achieve the effect of meeting the requirements of protection selectivity, ensuring continuous power supply, and reducing the scope of power outages

Inactive Publication Date: 2018-08-03
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiency in the prior art that the failure of the microgrid main network or contact area cannot be diagnosed, and to provide a networked microgrid asymmetrical fault area detection device that can accurately diagnose the location of the fault and diagnostic methods

Method used

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  • Networked microgrid asymmetrical fault area detection device and diagnosis method
  • Networked microgrid asymmetrical fault area detection device and diagnosis method
  • Networked microgrid asymmetrical fault area detection device and diagnosis method

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Experimental program
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Embodiment 1

[0054] Such as figure 1 The illustrated embodiment is a detection device for an asymmetrical fault area of ​​a networked microgrid. The microgrid 1 is connected to the main grid 332 through the contact area 2, and the contact area includes the first circuit breakers CB connected in series. A , contact transformer 21 and the second circuit breaker CB B The fault detection device includes a first impedance measurement element 3 connected to the main grid side bus data, a second impedance measurement element 4 connected to the micro grid side bus data, an access switch 5 installed at the micro grid common connection point, and The negative-sequence voltage starting element 7 connected to the microgrid side bus bar data; also includes a microprocessor 6, an alarm 9 and a display 10, and the microprocessor is connected with the alarm, the display, the first impedance measuring element, and the second impedance measuring element respectively It is electrically connected with the ne...

Embodiment 2

[0069] Embodiment 2 includes all structures and steps of Embodiment 1, such as figure 1 As shown, embodiment 2 also includes a memory 8 and a voltage transformer 11, the negative sequence voltage starting element is electrically connected to the microgrid side bus through the voltage transformer, and both the memory and the voltage transformer are electrically connected to the microprocessor.

[0070] Depend on Figure 10 Shown is a set of the most energetic IMF components used to capture the fault. A large number of simulation experiments show that this method can maximize the difference between fault and normal, which is very beneficial to fault detection.

[0071] In a broad sense, IMF is an evolution of Fourier transform, and this evolution that can describe energy amplitude changes and instantaneous frequency not only optimizes the effectiveness of time-frequency description, but also makes signal transformation fully applicable to nonlinear and analysis of non-stationa...

Embodiment 3

[0073] Embodiment 3 includes all structures and steps in Embodiment 1, and Embodiment 3 adopts the following steps to replace step 200 of Embodiment 1:

[0074] Step 210, calculate the real and imaginary parts of the impedance

[0075] The microprocessor reads the impedance value Z detected by the first impedance measuring element I and the impedance value Z detected by the second impedance measuring element II ; set Z I The real part of Re(Z I ),Z I The imaginary part of is Im(Z I ),(Z I +Z II ) is the real part of Re(Z I +Z II ),(Z I +Z II ) imaginary part is Im(Z I +Z II );

[0076] Step 220, using the rectangular coordinates of the impedance to judge the fault of the main network or the contact area

[0077] when and and and or Re(Z I )I )I +Z II )I +Z II ) < 0, the microprocessor will make a judgment that there is a fault in the main network or the contact area, the display will display information about the fault in the main network or the contact ...

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Abstract

The invention discloses a detection device and a diagnosis method for an asymmetrical fault area of ​​a networked micro-grid. The micro-grid is connected to the main network through a contact area, and the contact area includes a first circuit breaker CBA, a contact transformer and a second circuit breaker connected in series in sequence. Two circuit breakers CBB; the fault detection device includes a first impedance measurement element connected to the main grid side bus data, a second impedance measurement element connected to the micro grid side bus data, and installed at the access point of the micro grid public connection point The switch is a negative-sequence voltage start-up element connected to the microgrid side bus data; it also includes a microprocessor, an alarm and a display, and the microprocessor is connected to the alarm, the display, the first impedance measuring element, the second impedance measuring element and the The negative sequence voltage initiates the electrical connection of the elements. The invention has the characteristics of simple and fast diagnosis process, good reliability, strong anti-interference ability and strong operability.

Description

technical field [0001] The invention relates to the technical field of power grid systems, in particular to a networked micro-grid asymmetrical fault region detection device and a diagnosis method that can accurately diagnose the location of a fault. Background technique [0002] Due to the rapid development of electric energy and the needs of people's production and life, a new type of distributed power generation technology is also developing rapidly. Distributed power generation can make full use of the energy around it, and does not require large sites, small investment, and flexible power supply. However, due to the wide distribution range, a new type of microgrid needs to be established to solve its distribution problem. A micro-grid is a micro-grid composed of micro-power sources, loads, energy storage systems and control systems, which can be connected to the grid or run in isolation. The microgrid can not only complement the large power grid, optimize the allocatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 王颖潘明九孙黎滢周敬尧蔡慧陈卫民
Owner CHINA JILIANG UNIV
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