Excitation Fault Detection in Parallel Generators
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Solution Overview
Problem
Existing electrical protection systems for devices connected in parallel, such as generators and synchronous condensers, face challenges in detecting excitation faults without requiring direct electrical connections between devices, especially when they are separated by large distances, leading to potential cascading failures across the power bus.
Innovation Solution
A method and system using a sensor connected to an electrical device to determine changes in terminal voltage and reactive power, allowing for the detection of excitation fault conditions without needing to monitor neighboring devices, and enabling the isolation of faulty devices from the parallel bus to prevent cascading failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protection devices are implemented to detect failures and prevent cascading failures across the power bus, then system reliability is improved, but device complexity increases
Solution Approach 1:
The electrical device monitors its own terminal voltage and reactive power parameters independently, performing self-diagnosis for excitation faults without requiring complex interconnections with other devices or centralized monitoring systems
Solution Approach 2:
The system detects excitation faults by monitoring changes in electrical parameters (terminal voltage and reactive power) rather than requiring complex physical inspections or multiple sensor installations, simplifying the protection mechanism
2Measurement precision
If direct electrical connections are established between devices for fault detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the fault detection functionality from the interconnection system and implements it locally at each device through independent monitoring of terminal voltage and reactive power, eliminating the need for direct electrical connections between devices for diagnostic purposes
Solution Approach 2:
The terminal voltage and reactive power serve as intermediary parameters that indirectly indicate excitation fault conditions without requiring direct physical or electrical contact between devices, enabling remote and independent monitoring
3Measurement precision
If complex interconnections are implemented between devices for monitoring, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The monitoring system is segmented into independent units at each electrical device, with each device autonomously monitoring its own terminal voltage and reactive power, eliminating the need for complex centralized interconnections and simplifying system operation and maintenance
Data Source
AI summary
System, methods, and computer-readable storage media that may be used to detect excitation faults for electrical devices, such as generators and/or condensers, connected in a parallel configuration are provided. A method includes determining a change in a terminal voltage of one of the electrical devices with respect to a steady state terminal voltage. The method further includes determining a change in a reactive power of the electrical device with respect to a steady state reactive power. The method further includes determining whether an excitation fault condition exists based on the determined changes in terminal voltage and reactive power.