Substation Signal Aggregation Server with Time Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional data transmission methods for substation monitoring control systems, particularly n-to-one signal transmission, lack a correlative relationship between signal generation times and arrival times at the server, leading to inappropriate generation time attachment for aggregate signals sent to the upper level control center due to time lags in existing IEC standards.
Innovation Solution
Implementing a data transmission method that includes waiting processing and time adjusting processing at the server to aggregate signals from multiple line terminals, where the server waits for a preset condition to elapse before attaching the earliest generation time as the generation time of the aggregate signal, ensuring consistency with actual event occurrence times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If n-to-one signal transmission is implemented according to conventional IEC standards, then multiple signals from line terminals are aggregated into a single aggregate signal for transmission to the upper level control center, but the generation time of the aggregate signal becomes inaccurate due to time lags between signal arrival and processing
Solution Approach 1:
The server performs preliminary actions by storing arrival times of constituent signals and calculating wait times before generating the aggregate signal. This preliminary processing ensures that when signals are aggregated, the generation time can be accurately determined by adding the pre-calculated wait time to the earliest arrival time, rather than using the current time which would be inaccurate.
Solution Approach 2:
The invention creates a copy of the time relationship by storing arrival times and calculating wait times separately before generating the aggregate signal. This copying approach allows the system to preserve the temporal relationships of individual signals and reconstruct accurate generation time information in the aggregate signal without being affected by transmission delays.
2Speed
If the server immediately transmits signals as they arrive from line terminals, then data transmission delay is minimized, but the generation time attached to aggregate signals does not reflect actual event occurrence times
Solution Approach 1:
The server performs preliminary calculations of wait times and stores arrival times before generating aggregate signals. This allows the system to maintain fast transmission by not delaying signal processing, while still accurately determining generation times through pre-computed values that reflect actual event timing rather than transmission timing.
Solution Approach 2:
The invention introduces wait time as an intermediary parameter that mediates between the arrival time of constituent signals and the generation time of the aggregate signal. This intermediary allows the system to decouple the transmission speed from the timing accuracy, enabling fast transmission while preserving event timing information through the wait time calculation.
3Measurement precision
If the server waits for all constituent signals to arrive before generating the aggregate signal, then generation time accuracy is improved, but data transmission delay increases
Solution Approach 1:
The server performs partial waiting by calculating a predetermined wait time based on the earliest arrival time and signal types, rather than waiting for all signals to arrive. This partial action approach achieves sufficient generation time accuracy by accounting for expected signal arrival patterns, while avoiding the excessive delay that would result from waiting for all signals regardless of actual needs.
Solution Approach 2:
The invention changes the parameter from waiting for all signals to waiting for a predetermined time period calculated based on the earliest arrival time. This parameter change allows the system to optimize between accuracy and delay by adjusting the wait time duration based on signal characteristics and arrival patterns, rather than using a fixed waiting approach.
Data Source
AI summary
According to one embodiment, a server 11 performs aggregate signal processing for n-to-one signal transmission. The processing includes waiting processing and time adjusting processing. In the waiting processing, from a time point where a first constitutional element signal constituting a specific aggregate signal bound for the upper level control center reaches the server until a wait time that is based on a preset condition elapses, the server waits for another constitutional element signal of the specific aggregate signal to arrive (S202-S208). In the time adjusting processing, the server extracts an earliest generation time from generation times attached respectively to constitutional element signals arriving during the waiting processing, and attaches the extracted time as a generation time of the specific aggregate signal (S210).