Determination method of power distribution network fault section and fault time
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A distribution network fault and fault time technology, applied in the direction of fault location, information technology support system, etc., to achieve the effect of simple calculation, reliable results and large amount of calculation
Inactive Publication Date: 2019-06-14
SHANDONG UNIV OF TECH
View PDF7 Cites 2 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0005] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method for judging the fault section and fault time of the distribution network, which can not only solve the problem of incomplete load characteristics, network topology, line concentration parameters, and line distribution parameters. Determination of the fault section under known conditions and the identification of the time when the fault occurs, and can meet the judgment results that meet the needs of practical applications
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0058] figure 1 It is a flow chart of a method for determining a distribution network fault section and fault time according to an exemplary embodiment. Such as figure 1 As shown, the embodiment of the present invention provides
[0059] A method for judging a distribution network fault section and fault time, the method comprising:
[0060] Build a dataset;
[0061] Calculate the evaluation index;
[0062] Set monitoring thresholds for fluctuations in evaluation indicators;
[0063] Determine the failure time and failure area based on the calculated evaluation index;
[0064] Determine the faulty phase.
[0065] In a possible implementation, the process of constructing the dataset includes:
[0066] Build a historical data set: use the data of the latest fault recovery of the measurement equipment at each measurement point to construct a historical data set, and calculate the maximum singular value σ of the covariance matrix of the historical data set through singular ...
Embodiment 2
[0089] figure 2 It is a flow chart of a method for determining a distribution network fault section and fault time according to another exemplary embodiment. Such as figure 2 As shown, the embodiment of the present invention provides
[0090] A method for judging a distribution network fault section and fault time, comprising:
[0091] Use historical measurement data and real-time online data to form historical data sets and online data sets respectively;
[0092] Solve the maximum singular value of the covariance matrix of the historical data set and the covariance matrix of the online data set respectively;
[0093] According to the ratio of the largest singular value, the distribution network fault section and fault time are judged.
[0094] In a possible implementation, the process of determining the distribution network fault section and fault time according to the ratio of the largest singular value includes:
[0095] First, real-time detection is performed on eac...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention discloses a determination method of power distribution network fault section and fault time. The determination method of the power distribution network fault section and the fault time comprises the steps that a data set is established; evaluation indexes are calculated; a monitoring threshold value for evaluating index fluctuation is arranged; the fault time and the fault area are determined based on the calculated evaluation indexes; and a fault phase is determined. Determination is conducted according to a history data set and a maximum singular value ratio of a covariance matrix of an online data set, real-time inspecting is conducted on all measuring points of the network, after the fault time is determined, the measured point data variation degree is determined according to the judgment results of all measured points of the fault time, the fault area is determined according to the fault generating time and variation degree rank, and the distance between the fault point and the measured point is determined through the variation degree, and the fault phase is judged through any measured point data in the fault area end. According to the determination method of thepower distribution network fault section and fault time, the determination method is suitable for all load levels, distribution regulation of distribution type electric supply and loads does not needto be obtained, the calculation amount is small, and principle and technical guarantee can be provided for a power distribution system with access to distribution type power or fault diagnoses for existing power distribution systems.
Description
technical field [0001] The invention relates to the technical field of distribution network protection including distributed power sources, in particular to a method for judging a distribution network fault section and fault time. Background technique [0002] The access of distributed power sources makes the distribution network change from a passive network to an active network, which changes the power flow direction of the distribution network and makes the fault characteristics change and make the existing relay protection of the existing distribution network prone to errors. It will have a non-negligible impact on the fault location, isolation and recovery of the distribution network. Accurate identification of the fault section is one of the important measures to effectively narrow the scope of fault location and ensure the reliable and stable operation of the system. Accurate determination of the time of fault occurrence provides guarantee for subsequent fault locatio...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more