Catenary Power Analysis for Dual-Constraint Storage Sizing
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Solution Overview
Problem
In catenary-based transportation systems, determining the optimal configuration of power supply equipment to minimize costs while ensuring voltage equality across the system, particularly for sites distant from electric power substations, is challenging due to varying catenary voltages and complex power management requirements.
Innovation Solution
An analysis device and method that calculate the minimum number of parallel electricity storage devices needed based on maximum input/output electricity and operational conditions to ensure cost-effective power supply, integrating electricity storage units with other power supply systems, and adjusting the power-supplying contribution ratio to meet target cost values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of electricity storage devices arrayed in parallel is increased to meet target cost values, then the cost of power supply equipment increases, but the voltage equality and power supply reliability deteriorate
Solution Approach 1:
The invention divides the determination of electricity storage device configuration into two separate minimum parallel-array numbers: a first minimum parallel-array number based on maximum input electricity and allowable input electricity, and a second minimum parallel-array number based on energy balance during high-frequency operation periods. By segmenting the problem into these two independent calculations and selecting the greater value, the system ensures both voltage equality and power supply reliability without unnecessarily increasing the number of devices
Solution Approach 2:
The invention changes the approach from directly specifying the number of electricity storage devices to calculating two different minimum values based on different operational parameters (maximum input electricity vs. energy balance during high-frequency periods). The final configuration is determined by selecting the greater of these two calculated values, optimizing the balance between cost and performance
2Quantity of substance
If the number of electricity storage devices is reduced to lower costs, then the cost of power supply equipment decreases, but the ability to maintain voltage equality and supply power deteriorates
Solution Approach 1:
The invention segments the power supply requirement into two distinct scenarios: normal operation (governed by maximum input electricity) and high-frequency operation periods (governed by energy balance). By calculating separate minimum parallel-array numbers for each scenario and selecting the greater value, the system ensures adequate power supply capability while minimizing the number of devices required
Solution Approach 2:
The invention applies partial action by calculating two separate minimum values and using only the necessary portion (the greater value) to satisfy both operational requirements. This avoids the excessive action of designing for the worst-case scenario alone, thereby reducing the number of electricity storage devices while maintaining reliability
3Quantity of substance
If the configuration of power supply equipment is optimized for cost reduction, then the cost value decreases, but the precision of meeting target cost values and operational requirements deteriorates
Solution Approach 1:
The invention changes the configuration determination from a single-parameter approach to a dual-parameter calculation method. By computing two distinct minimum parallel-array numbers based on different operational parameters and selecting the greater value, the system achieves precise configuration that exactly meets target cost values while satisfying all operational requirements
Solution Approach 2:
The invention incorporates feedback by using the calculated minimum parallel-array numbers to determine the final configuration. The system feedbacks from operational requirements (maximum input electricity and energy balance) to the configuration decision, ensuring that the chosen number of devices precisely meets both cost and performance targets
Data Source
AI summary
In a catenary-based transportation system which is provided with integrated power supply equipment having an electricity storage unit which stores electricity regenerated by vehicles traveling by electricity received from a catenary and supplies electricity to the catenary and the other power supply system which is a power supply system different from the electricity storage unit concerned, the performance of a rectifier of the other power supply system is determined based on a power-supplying contribution ratio γ of the other power supply system so that the cost value of the integrated power supply equipment becomes lower than a target cost value.