Resampling Power Signals for Consistent Synchrophasor Measurement
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Solution Overview
Problem
Existing systems face challenges in consistently measuring power quality parameters and synchrophasor measurements across various power systems operating at different frequencies, making it difficult to perform accurate and efficient analysis.
Innovation Solution
A method and system that utilize zero crossing detection to determine even angle positions and fundamental frequency, allowing for resampling of signals to produce an even angle signal, which is then used for power quality and synchrophasor analysis, sharing processing resources for both measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional measurement methods are used for power systems with variable frequencies, then the system can handle different frequency operations, but the measurement consistency and accuracy deteriorate
Solution Approach 1:
The patent transforms the variable frequency signal into a fixed sampling rate by detecting zero crossings and calculating the instantaneous frequency. The signal is then resampled at even angle positions based on the calculated fundamental frequency, converting a time-varying parameter problem into a fixed parameter measurement problem, thereby achieving consistent measurements across different operating frequencies
Solution Approach 2:
The patent introduces an intermediary processing stage that includes zero crossing detection, fundamental frequency calculation, and resampling. This intermediary transformation layer converts the original variable frequency signal into a standardized even angle signal, which then serves as the basis for consistent power quality and synchrophasor measurements regardless of the original frequency variations
2Measurement precision
If separate processing resources are allocated for power quality analysis and synchrophasor measurement, then measurement accuracy is maintained, but system complexity and hardware costs increase
Solution Approach 1:
The patent merges the signal processing functions for both power quality analysis and synchrophasor measurement into a single resampling pipeline. The even angle resampling algorithm serves both measurement types simultaneously, eliminating the need for separate processing resources while maintaining the accuracy requirements of both standards through shared computational infrastructure
Solution Approach 2:
The resampling algorithm developed in the patent is designed to be universally applicable to both power quality parameter measurement and synchrophasor measurement. The same even angle signal processing framework supports multiple measurement functions, allowing a single system to comply with both IEC 61000-4-30 and IEEE C37.118 standards without requiring dedicated hardware or software for each function
Data Source
AI summary
Performing power quality and synchrophasor analysis on a resampled signal. A first signal may be initially received which corresponds to a power system. The first signal may have a plurality of cycles and may have a frequency that varies over time. One or more parameters may be determined from the first signal. Based on the one or more parameters, the first signal may be resampled to produce an even angle signal. Various power quality measurements may be performed on the even angle signal. Similarly, further processing may be performed to perform synchrophasor measurements, e.g., to determine phasor, frequency, and/or rate of frequency change for the first signal. In some embodiments, the resampling processing elements (e.g., circuitry, programmable hardware elements, processors and memories, etc.) may be shared between the two analyses.