Station Auxiliary Power Source Dynamic Voltage Threshold
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Solution Overview
Problem
Existing systems for managing regenerative electric power in railway systems often lead to accumulation or unnecessary consumption of power, as they rely on fixed voltage thresholds, which can result in cross currents and inefficient use of regenerative energy.
Innovation Solution
A station auxiliary power source apparatus that calculates multiple average overhead cable voltage values over different time periods to dynamically determine a threshold for starting power conversion, allowing for accurate timing of regenerative energy consumption by station loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed charging start voltage is set, then the system can简单地 determine when to charge, but cross currents occur when voltage rises naturally without regenerative power available
Solution Approach 1:
The charging start voltage is changed from a fixed value to a dynamic value that adapts to actual operating conditions. The system calculates the average overhead cable voltage over a predetermined time period and sets the charging start voltage based on this dynamic average, allowing the threshold to adjust naturally with system conditions and preventing cross currents caused by rigid fixed thresholds.
Solution Approach 2:
The system continuously monitors the overhead cable voltage and uses this feedback to dynamically adjust the charging start voltage threshold. By calculating the average voltage over time and using it to set the threshold, the system creates a feedback mechanism that adapts to actual power availability and demand conditions, preventing erroneous charging operations.
2Reliability
If regenerative electric power is accumulated in power storage apparatus, then power can be supplied when no vehicles are running, but power is unnecessarily consumed when vehicles are actively exchanging power
Solution Approach 1:
The system dynamically determines the charging start voltage based on the average overhead cable voltage, enabling it to adapt to different operational phases. During active vehicle operation when voltage fluctuates with power exchange, the dynamic threshold prevents unnecessary charging. When vehicles stop running and voltage stabilizes at higher levels, the same mechanism enables appropriate charging to ensure power availability.
Solution Approach 2:
The charging start voltage parameter is changed from a fixed value to a dynamically calculated value based on average voltage. This parameter change allows the system to distinguish between voltage rises due to active power exchange (where charging should be avoided) and voltage levels indicating genuine power surplus (where charging is appropriate), thereby optimizing energy utilization.
3Loss of energy
If average voltage calculation is used to prevent cross currents, then energy waste is reduced, but the system cannot accurately distinguish between voltage rises from regeneration and voltage rises from no-load conditions
Solution Approach 1:
The system performs preliminary action by calculating the average overhead cable voltage over a predetermined time period before using it as the charging start voltage threshold. This preliminary averaging process filters out short-term fluctuations and establishes a baseline that helps distinguish between genuine power surplus conditions and transient voltage variations, improving the accuracy of charging decisions.
Data Source
AI summary
The present invention relates to a station auxiliary power source apparatus that converts power supplied from an overhead cable to generate power to be supplied to a load in a station. The station auxiliary power source apparatus includes a first average calculation unit that calculates the average value of the overhead cable voltage for every predetermined time period; a second average calculation unit that calculates, two or more times, an average value of the overhead cable voltage that is larger than a first average value of the average value among the overhead cable voltages; a third average calculation unit that calculates an average value of the overhead cable voltage per day; and a comparator that selects any one of a second average value of the average value and a third average value of the average value and sets the selected value as the threshold value.