Forced Oscillation Source Location via Synchrophasor Mode Angle Analysis
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Solution Overview
Problem
Modern power systems face challenges in identifying the source of forced oscillations, which are complex due to their interconnected and interactive nature with renewable energy resources, making it difficult to determine the location of the source of these oscillations, especially since they may terminate with disturbances, complicating corrective actions.
Innovation Solution
A method using phasor measurement units (PMUs) to receive synchrophasor measurements, determine dominant mode frequencies and mode angles, and perform least squares regression analysis to pinpoint the geographic source of forced oscillations by analyzing the mode angles and geographic locations of PMUs, enhancing the accuracy of source location determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If forced oscillations terminate immediately once disturbances are withdrawn, then the duration of the oscillation is short, but determining the location of the source becomes difficult
Solution Approach 1:
The system performs preliminary capture and storage of synchrophasor measurements during the forced oscillation event. By recording the oscillation characteristics (mode angles, frequencies) while they are still present, the system preserves the data needed for later source location determination, even after the oscillation terminates.
Solution Approach 2:
The patent uses synchrophasor measurements as an intermediary to indirectly detect the forced oscillation characteristics. Instead of directly measuring the oscillation source, the system measures voltage and current phasors at multiple PMU locations, which serve as intermediaries that contain information about the oscillation source that can be analyzed later.
2Measurement precision
If mode angles are used to determine source location, then measurement precision improves, but the complexity of data processing increases
Solution Approach 1:
The system extracts only the essential features from the synchrophasor measurements - specifically the mode angles and dominant frequencies of the forced oscillation. By taking out only these critical parameters needed for source location determination, the system reduces the complexity of data processing while maintaining high measurement precision.
Solution Approach 2:
The patent transforms the raw synchrophasor measurements into a different parameter space by calculating mode angles and dominant frequencies. This parameter transformation simplifies the source location problem, as the mode angle differences directly relate to the geometric relationship between PMU locations and the oscillation source.
Data Source
AI summary
A method includes performing by a processor: receiving a plurality of synchrophasor measurements of a power system signal associated with a time interval from a plurality of phasor measurement units (PMUs), respectively, each of the plurality of synchrophasor measurements including a phase angle, frequency value, and a timestamp associated with the synchrophasor measurement; determining, for each of the plurality of PMUs, a dominant mode frequency of a forced oscillation signal component of the power system signal based on the frequency value and the phase angle; determining, for each of the plurality of PMUs, a mode angle of the forced oscillation signal component at the dominant mode frequency; and determining a geographic forced oscillation source location for a source of the forced oscillation signal component based on the plurality of mode angles associated with each of the plurality of PMUs, respectively, and geographic locations of the plurality of PMUs.