Railroad Voltage Estimation via Tertiary Correlation
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Solution Overview
Problem
Accurately estimating the voltage in a power supply line for railroad vehicles is challenging due to regulation phenomena caused by fluctuations in secondary loads, which affect the tertiary voltage, making it difficult to calculate the primary voltage using the winding turns ratio.
Innovation Solution
A system comprising a voltage detector, current detector, and voltage calculator that uses correlation information to accurately estimate the primary voltage in the power supply line by detecting tertiary voltage and output current, even when tertiary voltage fluctuates, allowing for high-accuracy calculation of the primary voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the primary voltage is calculated using the winding turns ratio and detected tertiary voltage, then the voltage estimation method is simple, but the measurement precision deteriorates due to regulation phenomena and mutual induction effects
Solution Approach 1:
The patent introduces a correlation table as an intermediary between the tertiary voltage detection and primary voltage calculation. This table stores pre-established correlation data between tertiary voltage values and actual primary voltage values under various operating conditions. By using this intermediary lookup mechanism, the system avoids direct calculation using the winding turns ratio, thereby eliminating errors caused by regulation phenomena and mutual induction while maintaining computational simplicity.
2Adaptability or versatility
If the secondary load fluctuates, then the power converter can adapt to different operating conditions, but the tertiary voltage fluctuates due to mutual induction, making accurate voltage measurement difficult
Solution Approach 1:
The patent implements a feedback mechanism where the detected tertiary voltage is used to query the correlation table, which was pre-established based on various operating conditions including different secondary load levels. The system continuously monitors the tertiary voltage and uses the correlation information to determine the corresponding primary voltage, thereby compensating for fluctuations caused by mutual induction and maintaining accurate voltage measurement despite load variations.
3Measurement precision
If a direct primary voltage detector is installed, then the voltage measurement accuracy is high, but the device complexity and cost increase
Solution Approach 1:
Instead of directly measuring the primary voltage, the patent creates a computational copy of the primary voltage value by using the correlation table that maps tertiary voltage readings to corresponding primary voltage values. This indirect measurement approach replicates the accuracy of direct measurement without requiring physical contact with the high-voltage primary circuit, thereby reducing device complexity and safety risks while maintaining measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise estimation of the primary voltage in the power supply line, improving control methods for electric power supply to motors and reducing the need for direct primary voltage measurement, thus enhancing operational efficiency and accuracy.
Implementation Method 1
The transformer comprises a primary winding, a secondary winding, and a tertiary winding. The primary winding is configured to receive alternating primary voltage from a power supply line. The secondary winding is electromagnetically coupled to the primary winding and configured to output the output power. The tertiary winding is electromagnetically coupled to the primary winding
Implementation Method 2
The voltage detector is provided to the assembly and configured to detect a magnitude of the tertiary voltage
Implementation Method 3
The current detector is provided to the assembly and configured to detect a magnitude of the output current
Data Source
AI summary
A voltage estimating device for a power supply line according to one aspect of the present disclosure includes a voltage detector, a current detector, a voltage calculator. The voltage calculator calculates a magnitude of alternating primary voltage that a primary winding in a transformer receives from a power supply line based on a magnitude of tertiary voltage in the transformer detected by the voltage detector, a magnitude of output current in the transformer detected by the current detector, and correlation information. The correlation information indicates a correlation between a voltage ratio and the magnitude of the output current, and the voltage ratio represents a ratio of the magnitude of the primary voltage to the magnitude of the tertiary voltage.