Closed-Loop Arc Suppression for Distribution Network Ground Faults
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Solution Overview
Problem
Existing arc suppression methods for distribution network faults are limited in their applicability, as voltage-type methods are ineffective for low-resistance faults, while current-type methods are not suitable for high-resistance faults, leading to operational inefficiencies and potential safety hazards.
Innovation Solution
A closed-loop self-healing control-based fault arc suppression method that calculates the Pearson correlation coefficient between measured and virtual phase current transient changes to identify the target fault phase, and then adjusts the voltage and injects compensating current to bring the fault phase voltage and ground current to zero.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate voltage-type and current-type suppression methods are maintained, then each method can be optimized for its specific fault type, but system complexity increases and applicability is limited
Solution Approach 1:
The patent merges the functionality of separate voltage-type and current-type suppression methods into a single unified arc suppression control system. The system integrates both suppression approaches and uses Pearson correlation coefficient analysis to automatically select and apply the appropriate suppression method based on the detected fault characteristics, thereby reducing system complexity while maintaining suppression effectiveness for all fault types.
Solution Approach 2:
The patent implements a unified arc suppression control system that can adaptively handle both high-resistance and low-resistance faults through a single device. The system uses Pearson correlation coefficient calculation to identify fault characteristics and automatically adjusts its suppression strategy, making the device universally applicable to different fault types without requiring separate specialized equipment for each fault condition.
Data Source
AI summary
The invention relates to relay protection technology, specifically a method, system, and medium for fault arc suppression in distribution networks using closed-loop self-healing control. When a fault is detected in the distribution network, transient changes in the measured and virtual phase currents of each phase are obtained. The Pearson correlation coefficient between these changes is calculated to identify the target fault phase. The neutral point-to-ground voltage value is retrieved, and the target fault phase's voltage is adjusted to zero based on this value. The current from the fault phase, when its voltage is zeroed, is acquired. An injected current is then compensated at the neutral point to match this value, ensuring both the ground fault current and the fault phase voltage are reduced to zero. This method enhances the applicability of arc suppression for grounding faults in distribution networks.