HVDC Data Transmission Redundancy and Buffering
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Solution Overview
Problem
Existing HVDC transmission systems experience delays of up to 10 seconds during defects or disturbances due to the need for comparison counter feedback, leading to increased transmission duration and reduced efficiency.
Innovation Solution
Implementing a method where transmitting units store data messages in a buffer and receiving units send repeat requests only when message counters do not match, eliminating the need for counter feedback and allowing data retransmission via all channels, thus enhancing transmission speed and reducing channel load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving unit feeds back the comparison counter to the transmitting unit for verification, then data transmission reliability is improved, but transmission time increases significantly (up to 10 seconds delay)
Solution Approach 1:
The patent extracts the counter feedback mechanism from the data transmission path. Instead of feeding back comparison counters with each data message, the system only transmits repeat requests when message counters do not match, eliminating unnecessary feedback traffic and reducing transmission time while maintaining reliability through selective verification.
Solution Approach 2:
The transmitting unit stores previously transmitted data messages in a buffer before transmission. When a repeat request is received, the unit can quickly retrieve and retransmit the required message without needing to regenerate or request confirmation for the entire data set, thereby reducing the time penalty associated with verification.
2Measurement precision
If the comparison counter is fed back with each data message, then transmission accuracy is improved, but the transmission duration for current data increases
Solution Approach 1:
The patent applies partial action by performing counter comparison only when necessary (i.e., when message counters do not match) rather than with every data message. This selective verification maintains transmission accuracy for critical cases while avoiding the performance penalty of universal feedback, thus reducing overall transmission duration.
Solution Approach 2:
The receiving unit independently calculates the comparison counter using the same incrementation rule as the transmitting unit, without requiring the transmitting unit to echo back the counter value. This self-service approach eliminates redundant feedback traffic while maintaining accuracy through independent verification at the receiving end.
3Reliability
If redundant connecting channels are used for data transmission, then system reliability is improved, but channel load increases
Solution Approach 1:
The patent extracts unnecessary feedback traffic (comparison counters) from the redundant channels, keeping only essential control messages (repeat requests). This reduction in feedback traffic decreases the load on redundant channels while preserving their reliability function, as the channels are used primarily for data transmission rather than verification traffic.
Data Source
AI summary
A method for securely transmitting data messages in an HVDCT system. Each transmitting unit is connected to each receiving unit via at least two connection channels. Each data message includes a message counter that uniquely characterizes the data message, and each transmitting unit transmits the data message to each receiving unit via all of the connection channels. Each receiving unit calculates a comparison counter and compares it with the message counter in the received data message. If the message counter and the comparison counter do not match, a repetition request is transmitted to the transmitting unit for the purpose of transmitting a message counter that corresponds to the comparison counter. After the repetition request has been received, the transmitting unit accesses a transmission buffer, and the data message whose message counter corresponds to the comparison counter of the repetition request is transmitted via all of the connection channels.