Power Supply Frequency Sensing Using Waveform Derivatives
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Solution Overview
Problem
Existing power delivery systems face inefficiencies in frequency measurement, as they often require a complete power system cycle to determine frequency, which can be time-consuming and inadequate for fluctuating systems.
Innovation Solution
A method using waveform derivatives to calculate frequency in less than a complete power system cycle, allowing for more efficient and rapid frequency determination, enabling improved speed and accuracy in subsequent control operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional frequency measurement methods are used, then measurement accuracy is maintained, but measurement time increases (requiring a complete power system cycle)
Solution Approach 1:
The system performs preliminary actions by calculating the derivative of the voltage waveform and identifying peak points in advance. This allows the frequency measurement to be determined from pre-computed data points rather than requiring a complete cycle measurement, thus reducing measurement time while maintaining accuracy through careful selection of peak points that represent the waveform characteristics.
Solution Approach 2:
The invention extracts only the essential information needed for frequency measurement by identifying and using peak points from the voltage waveform and its derivative. Instead of analyzing the entire waveform cycle, the system extracts key characteristic points (peaks) that contain sufficient information to determine frequency, thereby reducing the time required while preserving measurement accuracy.
2Speed
If frequency measurement is performed in real-time for fluctuating systems, then system responsiveness is improved, but measurement complexity increases
Solution Approach 1:
The invention replaces complex mechanical or computational frequency measurement systems with a simplified mathematical approach using derivatives. By substituting the traditional cycle-counting method with derivative-based peak detection, the system achieves real-time responsiveness without increasing device complexity, as the derivative calculation is computationally efficient and can be implemented with standard processors.
3Productivity
If complete power system cycle measurement is used, then frequency determination accuracy is ensured, but control operation efficiency decreases
Solution Approach 1:
The system applies partial action by measuring only a portion of the power system cycle rather than waiting for a complete cycle. By using the derivative waveform and identifying peak points within a fraction of the cycle, the system obtains sufficient frequency information without requiring full cycle completion, thus improving control operation efficiency while maintaining adequate measurement precision for practical applications.
Data Source
AI summary
Systems and methods may be used to measure a frequency of a power delivery system and/or of a supply signal transmitted to a load. A system may record an input waveform, determine a frequency of the input waveform at a present time based at least in part on the input waveform and a derivative of the input waveform, and control an operation of a power delivery system based at least in part on the determined frequency.