Voltage Curve Analysis for Power Distribution Area Identification
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Solution Overview
Problem
Current power distribution area differentiation methods in smart grids face inaccuracies due to signal crosstalk and inability to differentiate phases, leading to errors in archive data and line loss computation, especially in complex rural-urban areas, requiring inefficient and resource-intensive manual processes.
Innovation Solution
A method utilizing voltage characteristics to differentiate power distribution areas and phases by collecting and analyzing voltage curves, employing a similarity comparison using the Pearson correlation coefficient algorithm to accurately determine node affiliations within power distribution areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power distribution areas are differentiated by communication signal strength or repeating levels, then differentiation can be achieved, but misjudgment rate increases due to signal crosstalk
Solution Approach 1:
The patent changes the differentiation parameter from communication signal characteristics (strength, repeating levels) to voltage characteristics (voltage curve patterns). By using voltage parameters that are inherently tied to the physical power distribution network topology, the system achieves accurate power distribution area identification without suffering from signal crosstalk interference, thereby improving both measurement precision and reliability
2Measurement precision
If transformer power supply is cut off to check power distribution areas, then accurate differentiation can be achieved, but user convenience deteriorates and testing cycle prolongs
Solution Approach 1:
The patent replaces the mechanical approach of physically cutting off power supply to test power distribution areas with an electronic/software-based solution. By analyzing voltage curve characteristics collected during normal operation, the system can accurately identify power distribution areas without interrupting power supply, thus maintaining user convenience while achieving precise differentiation
Solution Approach 2:
The system enables automatic identification of power distribution areas through continuous monitoring and analysis of voltage characteristics during normal operation. This self-service approach eliminates the need for manual power outages and human intervention, allowing the system to automatically and accurately determine power distribution area boundaries without affecting users
3Measurement precision
If power distribution area differentiation apparatus is installed and tested for each ammeter or terminal, then differentiation accuracy improves, but workload and costs increase hugely
Solution Approach 1:
The patent creates a universal solution where a single power distribution area differentiation apparatus can identify and differentiate multiple power distribution areas simultaneously by analyzing voltage curves from multiple nodes. This multi-functional approach eliminates the need to install and test separate differentiation devices for each ammeter or terminal, dramatically reducing workload and costs while maintaining high identification accuracy
Data Source
AI summary
A method for differentiating power distribution areas and phases by using voltage characteristics, where the method includes performing similarity comparison on a voltage curve of a node to be determined and a voltage curve recorded by a concentrator to determine whether the node belongs to a current power distribution area. Using the method for identifying power distribution areas and phases according to voltage characteristics, the problem of inaccurate electric power measurement due to power distribution area archive errors, communication crosstalk, and others is effectively resolved, a collection success rate and meter reading stability of a power distribution area are improved, a line loss rate of a power distribution area is moderately reduced, correctness of ammeter archive information of an SG186 system is ensured, occurrences of power distribution area crossing of carrier communications and ammeter archive errors are eradicated, and delicacy management of a marketing system is realized.