Phase Drift Compensation for Sampled Power Signals
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Solution Overview
Problem
Phase drift in sampled signals of electrical power systems leads to misleading comparisons when data points are not aligned correctly, causing sampling errors rather than reflecting the operation of the power system.
Innovation Solution
A method for compensating phase drift by calculating a phase drift-compensated window based on the phase difference between a signal of interest and a representative window, allowing accurate comparison and analysis of the power system's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase drift compensation is not applied, then the comparison process is simple and fast, but the measurement precision deteriorates due to misaligned data points
Solution Approach 1:
The patent applies preliminary action by calculating the phase drift compensation factor before comparing data points from different cycles. The method determines the phase difference between corresponding data points in the first and second cycles, computes a compensation factor based on this phase difference, and then uses this pre-calculated factor to adjust subsequent comparisons. This preliminary computation of the compensation factor eliminates the need for complex real-time phase alignment during data comparison, thereby improving measurement precision while maintaining processing efficiency.
2Reliability
If data points are compared without phase compensation, then the processing speed is high, but the reliability of power system monitoring deteriorates due to sampling errors
Solution Approach 1:
The patent applies parameter changes by transforming the phase domain relationship between data points. Instead of comparing data points directly in their original phase positions, the method changes the phase parameter by calculating a compensation factor that adjusts the phase alignment. This parameter transformation allows for reliable comparison of data points from different cycles by compensating for phase drift, thereby improving monitoring reliability while adding only minimal processing time for the compensation calculation.
3Manufacturing precision
If phase drift is ignored, then the analysis process remains simple, but the manufacturing precision of signal representation deteriorates
Solution Approach 1:
The patent applies mechanics substitution by replacing the need for complex mechanical or computational phase alignment mechanisms with a mathematical compensation approach. Instead of using sophisticated systems to physically or computationally align phases in real-time, the method substitutes this with a calculated compensation factor derived from phase difference measurements. This mathematical substitution simplifies the overall system while achieving precise signal representation by compensating for phase drift effects in the data comparison process.
Data Source
AI summary
Methods for processing a signal of interest in an electrical power system are provided, as well as systems and computer program products for carrying out the methods. The methods include obtaining a representative window of data points from the signal of interest; obtaining a window of interest containing data points from the signal of interest; and comparing a phase drift compensated window to the representative window, wherein the compensated window is calculated in accordance with the window of interest and a phase drift that is present in the window of interest relative to the representative window.