Unlock instant, AI-driven research and patent intelligence for your innovation.
Multi-dimension and multi-level association rule based voltage sag predicting and analyzing method
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 technology of voltage sag and predictive analysis, applied in forecasting, instrumentation, data processing applications, etc., can solve problems such as industrial production loss
Active Publication Date: 2013-11-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF7 Cites 31 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
Actual monitoring was carried out on 550 power supply points, and the measurement results of industrial users showed that: on average, each user had 38 voltage sags per month per phase, that is, voltage sags occurred on average every day, causing serious losses to industrial production
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
[0036] The sample sag data source of this embodiment is to select 4052 voltage sag records from 2008 to 2012 in a provincial power quality monitoringsystem, and the sample includes 10 regions and 66 monitoring points. By setting different min_sup and min_conf, the corresponding strong association rules in the sag sample set can be mined, and the sag association rule base of the sample set can be constructed. Assuming several sets of prediction conditions, the possible dip prediction results can be obtained based on the rule base.
[0037] The implementation steps based on this sample are as follows:
[0038] 1. Select the mining dimension: the area where the monitoring point is located, the voltage level, the load type, the season of sag occurrence, the week of occurrence, the time period of occurrence, and the cause of sag;
[0040] 1) Monitoring points are stratified by 10 areas: 0, 1, 2, 3, 4, 5, 6, 7...
Embodiment 2
[0059] The sample data of this embodiment is the same as that of Embodiment 1. Select monitoring points, voltage levels, load types, and sag reasons as mining dimensions.
[0060] Based on this sample, the implementation steps of the voltage sag prediction analysis method based on multi-dimensional and multi-layer association rules are as follows:
[0061] 1. Select the mining dimension: the area where the monitoring point is located, the voltage level, the load type, and the cause of the sag;
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 provides a multi-dimension and multi-level association rule based voltage sag predicting and analyzing method, belonging to the technical field of power quality analysis methods. The method comprises the steps of selecting the sag association rule mining dimension; discretizing historical data; mining a sag association rule according to the minimum support and minimum confidence degree; building a voltage sag association rule knowledge base; and matching the association rule to obtain the prediction conclusion. The method has the beneficial effects that the historical voltage sag association rules are mined, the strong association rules obtained after mining form the knowledge base, and the grid operation conditions probably occurring in the future serve as the prediction conditions and are input into the rule base to be matched, so that the voltage sag conditions probably occurring in the future can be obtained. The method is a major supplement to the existing intelligent power qualitymonitoring system, and has very great practical significance.
Description
technical field [0001] The invention relates to a voltage sag prediction and analysis method based on multi-dimensional and multi-layer association rules, and belongs to the technical field of power quality analysis methods. Background technique [0002] Power quality problems include two aspects: steady-state power quality and transient power quality. With the gradual advancement of electricity marketization and the development of industrial automation and national economic informatization, on the one hand, the nonlinear load in the distribution network poses a serious threat to the power quality of the power grid; on the other hand, in the distribution network, such as computer The high sensitivity of power consumption equipment to system interference has put forward high reliability, high transient stability, and high controllability requirements for power quality. According to monitoring data, 80% or more of existing power quality problems are caused by voltage sags. T...
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 
