DC Feeder Voltage Computing for Railway Power Efficiency
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Solution Overview
Problem
Conventional methods for reducing power consumption in DC-electrified sections of electric railway systems are ineffective, especially when train operation is difficult to control, leading to inefficient use of regenerative power.
Innovation Solution
A DC feeder voltage computing device that computes optimal substation voltage settings based on model information and run history data to minimize power consumption, using a system that includes a model information storing unit, a run history information storing unit, and a voltage setting value computing unit to control substation voltages and manage regenerative power effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If train operation control (speed, acceleration, deceleration) is used to reduce power consumption, then power consumption can be reduced in some cases, but it becomes ineffective when train operation is difficult to control
Solution Approach 1:
The invention changes the control parameter from train operation parameters (speed, acceleration, deceleration) to substation voltage. By adjusting the voltage supplied to the DC-electrified section, the system can reduce power consumption without requiring changes to train operation, thereby maintaining effectiveness across all operational conditions including those where train control is difficult.
2Use of energy by moving object
If substation voltage is controlled to optimize power consumption, then energy-saving efficiency improves, but system complexity increases due to additional computing and control requirements
Solution Approach 1:
The system performs preliminary computation of optimal voltage settings using run history information and model data before actual operation. This pre-computation approach allows the complex optimization calculations to be done in advance, reducing the real-time control burden while maintaining high energy-saving efficiency during actual operation.
Solution Approach 2:
The invention uses run history information as a simplified copy or representation of actual operational patterns. By analyzing historical data and creating computational models based on these copies, the system can perform optimization without requiring complex real-time measurements and control, thereby reducing system complexity while maintaining effectiveness.
3Measurement precision
If real-time train data is used for voltage control, then control accuracy improves, but response time decreases due to control delays
Solution Approach 1:
The system performs voltage optimization computations in advance using historical run data and model information, generating optimal voltage settings before they are needed for actual operation. This preliminary action eliminates control delays by having the control strategy ready beforehand, while still achieving accurate control based on comprehensive analysis of operational patterns.
Solution Approach 2:
The invention introduces run history information and computational models as intermediaries between actual train operations and voltage control. Instead of directly using real-time train data which causes delays, the system uses processed historical information as an intermediary that captures essential patterns without requiring real-time data transmission and processing, thereby reducing response time while maintaining control accuracy.
Data Source
AI summary
A DC feeder voltage computing device includes a model information storing unit, a run history information storing unit, and a voltage setting value computing unit. The model information storing unit stores model information. The run history information storing unit stores, on a per train basis, run history information that indicates locations and power situations of a plurality of trains that run in a DC-electrified section on or before a preceding day. The voltage setting value computing unit computes, on the basis of the model information and the run history information, a voltage setting value for controlling a substation voltage to cause an amount of power consumption in the DC-electrified section to satisfy a preset condition.