Frequency Measurement Synchronization for Inaccurate Asset Clocks

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Solution Overview

Problem

Existing demand response systems face challenges in integrating smaller energy assets with less accurate clocks, as they struggle to meet the strict timing requirements for frequency and voltage measurements, which can significantly impact the accuracy of reported frequency values.

Innovation Solution

A method and system for determining a synchronization offset by receiving measurement data from multiple sources, calculating correlation measures for different time shift values, and selecting the time shift value that indicates the strongest correlation to correct the timing information in measurement data.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If smaller energy assets with less accurate clocks are integrated into demand response systems, then the quantity of energy assets and system flexibility increase, but the measurement precision and timing accuracy deteriorate

Engineering Contradiction:
Improvequantity of energy assetsVSAvoidtiming accuracy
Core Design Contradiction:
Quantity of substanceVSMeasurement precision

Solution Approach 1:

The patent introduces a synchronization offset as an intermediary parameter that mediates between the inaccurate local clocks of smaller energy assets and the centralized time reference. By calculating and applying this offset, the system enables integration of assets with less accurate clocks without compromising overall measurement precision, thus resolving the contradiction between increasing asset quantity and maintaining timing accuracy.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the timing parameter by introducing a synchronization offset that corrects the absolute time stamps from smaller energy assets. This parameter transformation allows the system to accept data from assets with less accurate clocks while maintaining the required timing precision for frequency measurements, thereby enabling greater asset integration without sacrificing measurement quality.

Inventive Principle:
Principle #35Parameter changes

2Measurement precision

If very accurate local clocks are installed on each asset to meet timing requirements, then the measurement precision improves, but the device complexity and cost increase

Engineering Contradiction:
Improvetiming accuracyVSAvoidclock accuracy requirements
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

Instead of requiring each asset to have inherently accurate clocks, the patent introduces a synchronization offset as a mediator that corrects timing errors post-measurement. This approach maintains measurement precision without imposing complex and expensive accurate clock requirements on individual assets, thereby reducing device complexity while preserving timing accuracy.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a corrected version of the time stamp by applying the synchronization offset, effectively producing an accurate time reference without requiring the original measurement device to have high clock accuracy. This copying approach allows precise timing to be achieved through data processing rather than through expensive hardware requirements.

Inventive Principle:
Principle #26Copying

3Ease of operation

If absolute time stamps from smaller energy assets are used directly, then the ease of operation and integration simplify, but the measurement precision and frequency accuracy deteriorate

Engineering Contradiction:
Improveintegration simplicityVSAvoidfrequency accuracy
Core Design Contradiction:
Ease of operationVSMeasurement precision

Solution Approach 1:

The synchronization offset serves as an intermediary correction mechanism that maintains the simplicity of integrating smaller energy assets while compensating for their timing inaccuracies. By applying this offset to the absolute time stamps, the system preserves ease of integration without sacrificing frequency measurement precision, thus resolving the contradiction between operational simplicity and measurement accuracy.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentUS20250192551A1Synchronization of frequency measurements in a demand response system
Publication Date: 2025.06.12 CENTRICA BUSINESS SOLUTIONS BELGIUM NV
  • US20250192551A1 patent drawing
  • US20250192551A1 patent drawing
  • US20250192551A1 patent drawing

AI summary

Disclosed is a method of determining a synchronization offset for measurement data relating to an electrical power supply network. First and second data sets of measurement data are received from a first source and a second source. Each data set includes measurements of an electrical parameter of the network measured at the respective source together with time information indicating measurement times of the measurements. Correlation measures are determined for each of a plurality of time shift values, indicating correlation between a first set of measurement values derived from the first data set and a second set of measurement values derived from the second data set, with one of the first and second sets of measurement values being derived under application of a time shift corresponding to the respective time shift value. One of the time shift values is selected in dependence on the correlation measures and used to provide a synchronization offset. The synchronization offset is used to correct time information in measurement data from one of the sources.