Power Grid Disturbance Detection Using Magnetic Field Sensors
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Solution Overview
Problem
Existing methods for monitoring power grid disturbances often require measuring frequency changes over several cycles and filter out higher frequencies, making them inefficient for quick disturbance evaluation in electric power transmission networks.
Innovation Solution
The method involves monitoring magnetic and voltage fields using sensors, determining changes in these fields without filtering higher frequencies, and using digital sampling and mathematical transformations like Fourier or Laplace to quickly identify disturbances, allowing for precise location and forecasting of power demands and commodity costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency changes are measured over several cycles and high frequency components are filtered out, then measurement reliability is improved, but response speed and disturbance evaluation efficiency deteriorate
Solution Approach 1:
The patent replaces traditional mechanical/electronic filtering methods with signal processing algorithms. Instead of using physical filters to remove high frequency components, the invention uses digital signal processing techniques to analyze frequency changes, enabling both high reliability and fast response without the trade-off imposed by physical filtering systems
Solution Approach 2:
The invention changes the measurement approach by not requiring complete frequency cycle measurements. Instead of measuring entire frequency cycles over multiple periods, the system detects disturbances by analyzing changes in frequency parameters directly, allowing for rapid disturbance evaluation without waiting for complete cycle information
2Measurement precision
If complete frequency cycle measurement is required, then measurement precision is improved, but time consumption and disturbance evaluation speed worsen
Solution Approach 1:
The system performs preliminary setup by establishing baseline frequency characteristics and measurement thresholds before actual disturbance detection begins. This preliminary configuration allows the system to quickly evaluate disturbances without needing to collect complete frequency cycle data during the actual measurement process, significantly reducing time consumption while maintaining precision
Solution Approach 2:
The invention uses partial frequency information rather than requiring complete frequency cycles for measurement. By analyzing available frequency data fragments and using signal processing to reconstruct or evaluate disturbances from partial information, the system achieves both measurement precision and fast response without the time penalty of waiting for complete cycles
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables rapid evaluation and localization of disturbances in the power grid, reducing the need for multiple cycle frequency measurements and providing real-time data for improved power grid stability and forecasting.
Implementation Method 1
monitoring a magnetic field at a first magnetic field sensor, determining a first change in value of a feature associated with the magnetic field at the first magnetic field sensor
Data Source
AI summary
An apparatus (10) and method for monitoring power transmission, disturbances and forecasts in a power grid is disclosed. The apparatus (10) comprises a plurality of magnetic field sensors (30) or voltage sensors (50) for measuring a change in the magnetic field (35) or voltage over time at the electric power transmission line (20).