HVDC Sensor System with Per-Measurement Validity Indicators
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Solution Overview
Problem
In high voltage direct current (HVDC) networks, conventional sensor systems discard entire serial data units due to bit errors, leading to the loss of useful sensor information, especially in time-sensitive situations, as they do not account for individual data quality and require retransmission, which is unacceptable for HVDC applications.
Innovation Solution
A sensor system with multiple sensor devices generating serial data units that include validity indicators, allowing for the evaluation of individual sensor measurement quality, enabling the retrieval of useful information from error-affected data units, and optionally generating modified serial data units that include valid measurements or error indicators to reduce data loss, with a sensor management unit managing data forwarding and error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional error-detecting codes are used to detect errors in serial data units, then error detection capability is improved, but the entire serial data unit must be discarded when an error is detected, leading to loss of useful sensor information
Solution Approach 1:
The patent segments the error detection mechanism by providing separate error-detecting codes for each individual sensor measurement within the serial data unit, rather than a single error-detecting code for the entire data unit. This allows selective validation of individual measurements while preserving others that are error-free.
Solution Approach 2:
The patent applies local quality by making the error detection granularity match the data granularity - each sensor measurement has its own validity indicator and error-detecting code, enabling precise identification of which specific measurement is erroneous while preserving the integrity of other measurements.
2Reliability
If the entire serial data unit is discarded due to bit errors, then data integrity is maintained, but retransmission is required which increases latency and reduces system performance
Solution Approach 1:
The patent implements selective discarding and recovering by discarding only the erroneous individual sensor measurements while recovering and preserving the valid measurements within the same serial data unit, eliminating the need for complete retransmission.
Solution Approach 2:
The patent applies partial action by performing error detection and validation on an individual measurement basis rather than treating the entire serial data unit as a single entity, allowing partial acceptance of the data unit when only some measurements are erroneous.
3Loss of information
If individual validity indicators are provided for each sensor measurement, then useful information can be retrieved from error-affected data units, but the complexity of data processing increases
Solution Approach 1:
The patent segments the validity indication mechanism into individual validity indicators for each sensor measurement, enabling granular tracking of data quality without requiring complex overall validation logic.
Solution Approach 2:
Each sensor measurement includes its own validity indicator and error-detecting code, making the data self-describing and enabling the receiving system to autonomously determine which measurements are valid without requiring complex external validation processes.
Data Source
AI summary
There is provided a sensor system for use in a high voltage direct current network. The sensor system comprises a plurality of sensor devices, each sensor device configured to obtain a respective sensor measurement, wherein the plurality of sensor devices are configured to generate a serial data unit for transmission to a recipient system, the serial data unit configured to include the plurality of sensor measurements (S1, S2, Sn), the serial data unit further configured to include a plurality of validity indicators (FCS1, FCS2, FCSn), each validity indicator (FCS1, FCS2, FCSn) configured to provide an individual validity status of a respective one of the plurality of sensor measurements (S1, S2, Sn).