Power Grid Oscillation Recognition With Dynamic Data Windows
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Solution Overview
Problem
Existing methods for recognizing electrical oscillations in power supply systems often use a fixed number of values to calculate parameters, leading to incorrect calculations at the start of an oscillation, which can result in unnecessary countermeasures and destabilization of the system.
Innovation Solution
Adapting the number of successive values used to calculate parameters dynamically based on the sequence of the oscillation variable, using a data buffer with a variable length or size, and transforming values into the frequency domain for accurate characterization of oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed number of values is used to calculate oscillation parameters, then the calculation is simple and fast, but the parameter calculation is incorrect at the start of an oscillation
Solution Approach 1:
The patent applies the dynamics principle by making the number of values used for parameter calculation variable rather than fixed. The calculation window adapts dynamically based on the detected oscillation state: during oscillation events, only values from the oscillation period are used, while in steady states, a fixed number of values is used. This resolves the contradiction by allowing accurate parameter calculation during oscillations without permanently increasing system complexity.
Solution Approach 2:
The patent changes the parameter of the number of values used in calculation based on the operational state. By detecting oscillation characteristics and adjusting the calculation window size accordingly, the system uses fewer values during oscillations to avoid contamination from pre-oscillation data, while using a standard fixed number of values during normal operation. This parameter adaptation resolves the accuracy issue without maintaining constant complexity.
2Quantity of substance
If values from before oscillation start are included in parameter calculation, then more data is available for calculation, but incorrect parameters are calculated due to mixing oscillation and non-oscillation values
Solution Approach 1:
The patent extracts only the relevant values from the data stream for parameter calculation. By detecting the start and end of oscillation events, the system isolates and uses only the values that actually represent the oscillation state, excluding values from before oscillation begins and after it ends. This extraction principle resolves the contradiction by providing sufficient calculation data (all oscillation values) while preventing contamination from non-oscillation values.
Solution Approach 2:
The patent segments the data stream into distinct oscillation and non-oscillation periods. By identifying transition points where oscillations begin and end, the system creates separate calculation windows: one for oscillation values and another for normal operation values. This segmentation allows accurate parameter calculation during oscillations using only relevant data, while maintaining adequate data quantity for reliable statistics.
3Productivity
If a fixed calculation window is used, then the calculation process is simple, but timely recognition of oscillations is delayed
Solution Approach 1:
The patent implements dynamic adjustment of the calculation window size based on real-time oscillation detection. When an oscillation is detected, the window contracts to include only oscillation values, enabling immediate parameter calculation. When no oscillation is present, the window expands to a standard fixed size for normal operation. This dynamic behavior resolves the contradiction by enabling fast oscillation recognition without permanently sacrificing calculation simplicity.
Solution Approach 2:
The patent performs preliminary detection of oscillation start conditions before full parameter calculation begins. By monitoring for oscillation indicators and detecting the transition point in advance, the system can quickly switch to oscillation-specific calculation mode, reducing the time delay between oscillation onset and accurate parameter availability while maintaining simple fixed-window calculation during normal states.
Data Source
AI summary
A method for recognizing an electrical oscillation in an electrical power supply system, in which an electrical oscillation variable is determined for at least one measuring point in the power supply system. Parameters of an electrical oscillation are calculated on the basis of a time curve of the oscillation variable for the at least one measuring point, and the presence and type of an electrical oscillation is deduced using the parameters. To be able to provide correct parameters for assessing the oscillation in a timely fashion after the start of the oscillation, it is proposed that the number of those successive values of the oscillation variable from which the parameters of the electrical oscillation are calculated is adapted dynamically to the sequence of values of the oscillation variable.