Legacy TWACS Meter Waveform Sampling to Reduce False Synchronization
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Solution Overview
Problem
Legacy electrical meters in TWACS systems lack an analog-to-digital converter, limiting their ability to directly observe powerline waveforms and resulting in unreliable signal detection and increased false synchronizations.
Innovation Solution
Reconfiguring the microprocessor, digital-to-analog converter, comparator, and ancillary circuitry within legacy TWACS meters to function as a rudimentary analog-to-digital converter, enabling direct observation of powerline waveforms through firmware changes without hardware modifications, allowing for sophisticated signal-based detection algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy meters use threshold-crossing algorithm for TWACS signal detection, then the meter structure remains simple and cost-effective, but the signal detection reliability deteriorates and false synchronizations increase
Solution Approach 1:
The patent combines the DAC, comparator, and microprocessor into an integrated ADC function, allowing legacy meters to perform direct waveform observation without adding separate ADC hardware. This merging approach maintains cost-effectiveness while enabling sophisticated signal processing algorithms that improve detection reliability and reduce false synchronizations.
Solution Approach 2:
The patent changes the operational parameters of existing components by reconfiguring the microprocessor to control the DAC and comparator in a new manner, effectively transforming the threshold-crossing algorithm into a direct waveform sampling system. This parameter change enables sophisticated signal processing without hardware modification.
2Reliability
If legacy meters are replaced with new meters containing ADC, then signal detection reliability improves, but the cost increases
Solution Approach 1:
The patent enables legacy meters to self-upgrade their functionality by reconfiguring existing components through firmware updates. The meter's own microprocessor and DAC are repurposed to create ADC functionality, eliminating the need for external hardware replacement and reducing utility costs while maintaining improved detection reliability.
Solution Approach 2:
The patent recovers unused or underutilized components in legacy meters (the DAC and comparator) and repurposes them to provide ADC functionality. This recovery of existing components avoids the cost of replacing meters while achieving the reliability improvements associated with direct waveform observation.
3Measurement precision
If threshold-crossing algorithm is used for signal detection, then the meter hardware remains simple, but measurement precision of powerline waveforms deteriorates
Solution Approach 1:
The patent replaces the indirect mechanical threshold-crossing detection method with a direct digital sampling approach using the reconfigured DAC-comparator-microprocessor system. This substitution enables precise waveform measurement by capturing actual voltage values at multiple points, transforming the measurement process from indirect inference to direct observation.
Data Source
AI summary
An electrical meter (M) installed at a facility (F) supplied electrical power by a utility's (U) electrical distribution system (EDS) utilizes a two-way automatic communications system (TWACS) for receiving messages from the utility sent over the electrical distribution system using the TWACS. An improvement to the meter comprises reconfiguring existing components installed in the meter to function as an analog-to-digital (ADC) converter so to facilitate processing of powerline waveforms (WF) propagated through the electrical distribution system by application of a signal based detection algorithm. This improves detection of signal elements comprising a message sent via the TWACS and by other means and incorporated in the electrical waveforms thereby reducing occurrence of a false synchronization with the message elements so a content of a message is readily ascertained by the meter.