Dynamic Protection Criterion Adjustment for Electrical Network Topology Changes
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Solution Overview
Problem
Existing protection devices in electrical networks mal-operate or lose protection due to changes in network topology, as their criteria are not dynamically adapted to real-time changes, leading to potential faults and vulnerabilities.
Innovation Solution
A protection apparatus with a controller that receives real-time information on topological changes and performs online determination of the impedance or admittance matrix to adapt protection criteria, ensuring dynamic and automatic adjustments to match the network's new structure, thereby preventing mal-operation and ensuring reliable protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protection criteria are based on previous topological structure, then protection devices can operate with fixed settings, but they mal-operate or lose protection when network topology changes
Solution Approach 1:
The protection criterion is transformed from a static, fixed value to a dynamic value that automatically adjusts with network topology changes. The controller continuously monitors topological structure and recalculates protection criteria in real-time, ensuring the protection device adapts to any network configuration changes while maintaining reliable operation.
Solution Approach 2:
A feedback mechanism is implemented where the controller receives real-time information about topological structure changes from the network, processes this information to determine updated protection criteria, and sends commands to adjust the protection device settings. This closed-loop feedback ensures the protection criterion continuously matches the actual network state.
2Reliability
If protection criterion is adapted dynamically to topological changes, then protection reliability is maintained, but system complexity increases due to real-time monitoring and calculation requirements
Solution Approach 1:
The controller is designed as a multi-functional device that simultaneously performs real-time topological structure monitoring, impedance/admittance matrix calculation, protection criterion determination, and communication with protection devices. By consolidating these functions into a single universal controller, the system achieves dynamic adaptation without proportionally increasing overall system complexity.
Solution Approach 2:
The protection system becomes self-adjusting through automatic detection of topological changes and self-recalculation of protection criteria without requiring external intervention. The controller autonomously monitors the network, detects changes, and updates protection settings, reducing the need for complex external monitoring and manual adjustment systems.
3Device complexity
If offline determination of protection criterion is used, then system complexity is reduced, but the protection criterion does not match real-time network variations leading to mal-operation
Solution Approach 1:
The controller pre-calculates and stores the impedance/admittance matrix for various anticipated topological configurations based on the network's one-line diagram. When a topology change is detected, the controller quickly retrieves and applies the pre-computed protection criterion corresponding to the new configuration, achieving real-time accuracy without complex on-the-fly calculations.
Solution Approach 2:
The protection criterion transitions from a static offline value to a dynamic value that updates in real-time according to actual network topology. The system continuously adapts the protection criterion to match current network conditions, ensuring high accuracy while using efficient calculation methods that manage computational complexity.
Data Source
AI summary
There is provided a protection apparatus for protecting an electrical network. The protection apparatus comprises: at least one protection device configured to protect the electrical network from a fault in response to a or a respective protection criterion being met; and a controller configured to: receive real-time information on a change in topological structure of the electrical network; perform an online determination of the real-time impedance or admittance matrix of the electrical network based on the change in topological structure of the electrical network; and adapt the or each protection criterion based on the real-time impedance or admittance matrix.