Wide Area Protection Reliability Assessment Model
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Solution Overview
Problem
Current wide area protection systems lack a comprehensive reliability analysis model, with research only focusing on communication network reliability, failing to account for overall system reliability.
Innovation Solution
A method for reliability assessment involving acquiring information acceptance rates, calculating initiation, fault area positioning, and fault element recognition accuracies, and multiplying these to obtain the decision accuracy of the wide area protection system, incorporating a device with acquiring and calculation units to perform these steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional relay protection systems are used, then the system structure is simple, but the system cannot handle complex network architectures and flexible operation modes, leading to incorrect actions
Solution Approach 1:
The wide area protection system is segmented into multiple functional modules: information acquisition modules at different substations, communication network components, and a central processing module. This segmentation allows the system to handle complex network architectures by dividing the protection function across multiple distributed elements while maintaining overall system coordination.
Solution Approach 2:
A wide area monitoring center serves as an intermediary between distributed substation protection devices and the central control system. This intermediary collects information from multiple substations, performs comprehensive analysis, and coordinates protection actions, enabling the system to manage complex network relationships while maintaining centralized control.
2Adaptability or versatility
If wide area protection system is implemented, then the system can handle complex networks and flexible operation modes, but the system becomes dependent on wide area information flow and communication networks
Solution Approach 1:
The system performs preliminary information collection and processing at distributed substation levels before transmitting to the central monitoring center. Local preprocessing of protection information reduces communication dependencies and ensures that critical protection functions can operate even if communication is temporarily degraded.
Solution Approach 2:
The system dynamically adjusts protection parameters and decision-making thresholds based on the quality and completeness of received wide area information. When information flow is degraded, the system adapts by modifying its decision criteria to maintain reliable operation under varying communication conditions.
3Reliability
If comprehensive reliability analysis model is developed, then the system can assess overall reliability including mechanical failures, but the analysis complexity and computational requirements increase
Solution Approach 1:
The reliability analysis model is segmented into distinct components: communication network reliability assessment, protection algorithm reliability evaluation, and mechanical device reliability analysis. Each component is modeled separately with appropriate methods, and results are integrated to provide comprehensive system reliability assessment, reducing overall model complexity.
Solution Approach 2:
The reliability analysis framework is designed as a universal model that can assess multiple system components (communication networks, protection algorithms, mechanical devices) using a unified methodology. This multi-functional approach allows comprehensive reliability evaluation while maintaining consistent analysis procedures across different system elements.
Data Source
AI summary
The disclosure provides a method and device for reliability assessment of a wide area protection system, solving the technical problem that a reliability research result of a current wide area protection system is only limited to reliability research of a communication network thereof, but a reliability analysis model for an overall system does not exist. The method provided by the disclosure includes: S1, acquiring an information acceptance rate d of a wide area monitoring center of a wide area protection system; S2, obtaining the accuracy psf(d) of wide area protection initiation, the accuracy pfz(d) of fault area positioning and the accuracy pfc(d) of fault element recognition according to the information acceptance rate d; and S3, multiplying the accuracy psf(d) of wide area protection initiation, the accuracy pfz(d) of fault area positioning and the accuracy pfc(d) of fault element recognition to obtain the decision accuracy Pdmp of the wide area protection system.