Power Grid Oscillation Damping Ratio from Two Extreme Points
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Solution Overview
Problem
Existing methods for calculating the oscillation damping ratio of a power grid suffer from poor real-time performance and are unable to analyze the damping ratio when a complete oscillation waveform is not obtained.
Innovation Solution
A method that detects oscillation extreme points and direct current components, calculates the oscillation period and decay time constant, and uses these values to determine the oscillation damping ratio, enabling real-time calculation even with incomplete waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fitting method is used to calculate the oscillation damping ratio, then the calculation can be performed, but the real-time performance is poor and complete oscillation waveform is required
Solution Approach 1:
The patent extracts only the essential features needed for calculation - specifically the oscillation extreme points (amplitude and time) - rather than requiring the complete oscillation waveform. By taking out just the critical data points (maximum and minimum values and their corresponding times), the method achieves accurate damping ratio calculation without the time-consuming requirement of complete waveform data
Solution Approach 2:
The patent uses partial action by calculating the damping ratio using only two extreme points from the oscillation waveform rather than analyzing the entire waveform. This partial approach (using minimal necessary data points) achieves the calculation goal with reduced time loss while maintaining sufficient accuracy for practical purposes
2Reliability
If a fitting method is used to calculate the oscillation damping ratio, then the calculation can be performed, but it cannot calculate when a complete oscillation waveform is not obtained
Solution Approach 1:
The method extracts only the essential extreme points from the oscillation waveform - the maximum and minimum values and their corresponding times - to perform the damping ratio calculation. This extraction approach enables calculation availability even when complete waveform data is not obtained, as only critical data points are needed rather than the entire waveform
Solution Approach 2:
The patent employs partial action by using minimal data (just two extreme points) to achieve reliable damping ratio calculation. This reduces the data requirement complexity from needing complete waveforms to only requiring partial waveform information (extreme points), thereby improving calculation availability under various operating conditions
3Measurement precision
If conventional fitting methods are used, then complete waveforms are required for analysis, but this reduces the speed of calculation
Solution Approach 1:
The patent extracts only the critical extreme points (amplitude and time) from the oscillation waveform, eliminating the need to process complete waveform data. This extraction enables fast calculation by working with minimal essential data while maintaining sufficient analysis completeness for damping ratio determination
Solution Approach 2:
The method uses partial action by calculating damping ratio from just two extreme points rather than analyzing the complete waveform. This partial approach significantly increases calculation speed (productivity) while providing sufficiently complete analysis for practical damping ratio assessment in power system stability studies
Data Source
AI summary
The present invention disclosed a method for calculating an oscillation damping ratio of a power grid, and relates to the field of power system operation and control. When a power system oscillates, an oscillation period, two oscillation extreme points, and an oscillation direct current component start to be detected. Then an oscillation decay time constant is calculated according to the two oscillation extreme points and the oscillation direct current component. The oscillation damping ratio is calculated through the oscillation decay time constant and the oscillation period. Compared with a conventional fitting method, the conventional fitting method cannot calculate and analyze the oscillation damping ratio in a cast that a complete oscillation waveform is not obtained. The method proposed by the present inventive patent may complete the calculation of the oscillation damping ratio in a case of obtaining 2 pieces of data, so as to accelerate the speed of calculation.