Power grid fault detection method based on change point detection technology
A technology for change point detection and power grid faults, which is applied in the direction of detecting faults by conductor type, measuring electricity, fault location, etc., and can solve problems such as fault diagnosis accuracy in comprehensive utilization of fault information
Active Publication Date: 2019-02-22
HOHAI UNIV +1
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Problems solved by technology
In order to realize the collection and utilization of these data, the construction of power grid fault information system has been carried out in recent years, and some achievements have been achieved, but the comprehensive utilization of fault information and the accuracy of fault diagnosis are still not ideal
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[0022] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.
[0023] Aspects of the invention are described in this disclosure with reference to the accompanying drawings, which show a number of illustrated embodiments. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of numerous ways, since the concepts and embodiments disclosed herein are not limited to any implementation. In addition, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.
[0024] to combine figure 1 , figure 2 As shown, according to an embodiment of the present invention, a grid fault detecti...
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The invention provides a power grid fault detection method based on a change point detection technology. The method comprises the following steps: firstly, collecting real-time data of state variables of a power grid through multiple data sources, preprocessing the real-time data, and selecting measured data of the state variables of nodes to build time sequences; secondly, analyzing the time sequences by use of a change point detection technology based on RuLSIF, calculating the isolated value based on density ratio for the preprocessed data, and getting the change point detection value of state variable change related to each node of the power grid; thirdly, comparing the change point detection values according to set evaluation indicators, and evaluating the location or orientation of a fault; and finally, collecting the three-phase current and voltage of each node, getting the positive-sequence, negative-sequence and zero-sequence fault components during failure by use of a symmetrical component method, and judging the type of the fault through a sequence component phase selection method. According to the invention, the spatial and temporal change characteristics of the state variables of the power grid after failure are detected with the aid of the change point detection technology, and thus, the faulty node, the affected scope and the unaffected position can be judged.
Description
technical field [0001] The invention relates to the technical field of power system fault diagnosis, in particular to a power grid fault detection method based on change point detection technology. Background technique [0002] With the acceleration of intensive development of large coal power, large nuclear power, and large renewable energy bases, as well as the rapid development of large-scale, long-distance, high-voltage direct current transmission technology, my country's UHV power grid will form a "five vertical and six horizontal" structure , the power grid is more closely connected. The operation mode and dynamic behavior of the power grid are complex and changeable, and the interdependence and coupling between regional power grids are becoming stronger and stronger. The characteristics of the power grid will shift from a regional dominant mode to an overall mode, and the operating characteristics and dispatching control of the power grid will become very complicated. ...
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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 董惠婷王建山黄晓明楼伯良余一平黄弘扬孙维真金宇清鞠平陈新琪魏路平卢嘉华吴跨宇陆承宇赵一琰卢岑岑邓晖华文熊鸿韬张静沈赋沈亚玲孙卫娟张浩陈京
Owner HOHAI UNIV