Railway Vehicle Battery Power Conversion for Service Continuity
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Solution Overview
Problem
Railway equipment stops operating when electric power is not supplied from external sources, such as overhead lines, leading to service disruptions and safety concerns during maintenance in rail yards.
Innovation Solution
An electric power conversion device comprising an inverter that converts DC power to AC power, a battery for storing DC power, and a converter that charges the battery, allowing the battery to supply power to the inverter when external power is unavailable, ensuring continuous operation of railway equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric power is supplied from external sources (overhead lines), then railway equipment operates normally, but service disruptions occur when power supply is interrupted
Solution Approach 1:
The battery is charged in advance during normal operation when external power is available. This preliminary energy storage enables the system to maintain operation during power interruptions without service disruption
Solution Approach 2:
The battery acts as an intermediary energy storage device between the external power source and the railway equipment. It buffers power supply interruptions by providing alternative power during outages, ensuring continuous operation
2Reliability
If overhead lines are installed in rail yards, then power supply is available, but construction and installation costs increase
Solution Approach 1:
The battery-powered system enables the railway vehicle to serve itself with stored energy during maintenance operations in rail yards. The vehicle can operate independently without requiring external overhead line infrastructure, reducing construction costs
3Reliability
If third rails are installed on the ground, then power supply is available, but safety risks for maintenance personnel increase
Solution Approach 1:
The battery-powered system allows the railway vehicle to operate autonomously using onboard energy storage. This eliminates the need for ground-level third rails that pose electrical shock risks to maintenance personnel, significantly improving safety
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 continuous power supply to railway equipment, including electric motors and cabin systems, even during power failures or pantograph bounces, maintaining service levels and enhancing safety by eliminating the need for overhead lines and third rails in rail yards.
Implementation Method 1
an inverter which converts DC power into AC power and supplies the AC power to electric equipment of a railway vehicle
Implementation Method 2
a battery capable of storing DC power
Implementation Method 3
a converter which converts the AC power into DC power and charges the battery
Data Source
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AI summary
According to one embodiment, an electric power conversion device includes an inverter which converts DC power into AC power and supplies the AC power to electric equipment of a railway vehicle, a battery capable of storing DC power, and a converter which converts the AC power into DC power and charges the battery. The battery supplies electric power to the inverter when the electric power is not supplied to the inverter from an external power source.