Time-Zone SOC Control for Railway Regenerative Power
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Solution Overview
Problem
Conventional electricity storage control systems in railway systems do not effectively manage regenerative power storage and usage across different time zones, leading to inefficiencies and increased power consumption during peak hours.
Innovation Solution
An electricity storage control device that sets a target state of charge (SOC) for each time zone, controlling charging and discharging of the electricity storage device based on predicted energy demand, voltage of the feeder line, and characteristics of the storage device, allowing surplus regenerative power to be stored and utilized during peak hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional electricity storage control is performed in the same manner regardless of time zone, then the control system is simple to operate, but peak time power consumption cannot be reduced
Solution Approach 1:
The control device dynamically adjusts charging and discharging control based on time zones and predicted power loads. Instead of using a fixed control strategy, the system adapts its operation to match varying power demand patterns throughout the day, enabling peak time power consumption reduction while maintaining operational simplicity through automated dynamic adjustment.
2Loss of energy
If regenerative power is stored in the electricity storage device, then energy waste is reduced, but the storage device lifespan may be affected by excessive charging cycles
Solution Approach 1:
The control device changes operational parameters by adjusting charging and discharging strategies based on time zones and power load predictions. This allows the system to optimize energy utilization by storing regenerative power during appropriate periods while avoiding excessive charging cycles that would degrade the storage device, thus reducing energy waste without compromising lifespan.
Solution Approach 2:
The system uses feedback from power load predictions and time zone information to intelligently control charging and discharging operations. This feedback mechanism enables the control device to make informed decisions about when to charge or discharge, balancing the need to utilize regenerative power against the need to preserve storage device lifespan.
3Use of energy by moving object
If the electricity storage device charges and discharges frequently to meet peak demand, then peak time power consumption is reduced, but the storage device lifespan decreases
Solution Approach 1:
The control device performs preliminary actions by predicting future power loads and planning charging/discharging schedules in advance based on time zones. This allows the system to prepare energy storage strategies ahead of peak demand periods, reducing the need for frequent reactive charging cycles that would otherwise be required to meet sudden power demands, thereby preserving storage device lifespan.
Data Source
AI summary
According to one embodiment, an electricity storage control device includes a setting unit, and a control unit. The setting unit sets, for each time zone, a target state of charge (SOC) of electric energy to be stored in an electricity storage device in the time zone. The control unit controls at least charging or discharging of the electricity storage device based on the set target SOC for each time zone, a SOC detected from the electricity storage device, and a voltage of a supply destination of electric power from the electricity storage device.