Dynamic Overcurrent Relay Coordination via Graph Traversal
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Solution Overview
Problem
Existing electric power distribution systems face challenges in scalable automatic coordination of overcurrent relays during network reconfigurations, which can lead to suboptimal protection settings and increased damage to utility equipment.
Innovation Solution
A method and system utilizing a network graph searching mechanism and heuristic protection setting module to automatically coordinate protection settings for geographically dispersed overcurrent relays, incorporating a graph traversal mechanism to determine optimal settings and apply directional protection, and rule-based modules for scalable and fast protection coordination across multiple network reconfigurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If primary and alternate protection setting groups are used for overcurrent relays during switching events, then coordination is provided for limited reconfigurations, but the system is not scalable to arbitrary numbers of network reconfigurations
Solution Approach 1:
The protection setting is changed from static pre-defined groups to dynamic calculation based on current network topology. The system continuously updates relay settings according to the present configuration of switches and sources, enabling adaptation to any number of reconfigurations without requiring additional pre-defined setting groups.
Solution Approach 2:
The relay protection parameters (time dial settings, pickup currents) are automatically recalculated and adjusted based on the current network topology. This parameter adaptation allows the system to handle arbitrary reconfigurations by changing settings in real-time rather than relying on fixed pre-defined groups.
2Reliability
If pre-defined setting groups are selected until no coordination issues occur, then coordination is achieved, but the protection speed is not optimized and damage to utility equipment increases
Solution Approach 1:
The system implements a feedback mechanism where the coordination result is evaluated and used to automatically adjust the protection settings. The coordinator calculates optimal settings based on the evaluated coordination status, ensuring both accuracy and speed by iteratively optimizing the time dial settings rather than relying on slow selection from pre-defined groups.
Solution Approach 2:
The optimal protection settings are calculated in advance based on the network topology before a fault occurs. This preliminary calculation of time dial settings ensures that when a fault happens, the coordination is already optimized for fastest protection, eliminating the need for slow post-fault adjustment or selection from pre-defined groups.
3Ease of operation
If manual coordination of overcurrent relays is performed, then protection settings can be adjusted, but the process is time-consuming and cannot keep pace with automatic network reconfiguration
Solution Approach 1:
The protection coordination system performs self-service by automatically calculating and adjusting its own settings without manual intervention. The coordinator module autonomously evaluates the network topology and computes optimal time dial settings for all relays, enabling the system to keep pace with automatic network reconfiguration while maintaining coordination flexibility.
Solution Approach 2:
The manual mechanical adjustment of relay settings is replaced by an automated computational system. The coordinator uses algorithms to calculate optimal time dial settings and automatically configures the relays, substituting the slow manual process with fast electronic computation and adjustment that can keep pace with automatic network reconfiguration.
Data Source
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AI summary
Methods and systems are provided for automatically coordinating protection settings for relays within an electrical power distribution network. A method includes using a graph traversal mechanism to analyze geographical-based equipment data that contains information about overcurrent relays within the electrical power distribution network. A customizable rule base is applied to protection guidelines. Protection settings are determined based upon the applied customizable rule base and the direction of fault current flow from each source. The determined protection settings are used for the overcurrent relays to control switches in the electrical power distribution network in response to a detected fault.