EV Charging Power Allocation Using User-Demand Priority
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Solution Overview
Problem
Existing power reception control methods do not account for user demands when distributing electric power among power storage elements, leading to inefficiencies in charging and discharging processes.
Innovation Solution
A power reception control method that calculates a degree of priority for each power storage element based on user demands, such as remaining time or target state of charge, to distribute differential electric power effectively and level the state of charge across elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electric power is shared equally among power storage elements without considering user demands, then the control system is simple, but the charging efficiency and user satisfaction deteriorate
Solution Approach 1:
The patent changes the control parameter from equal power distribution to priority-based power distribution. Each power storage element is assigned a priority value based on user demand (such as remaining time or target state of charge), and the differential electric power is allocated according to these priority values. This parameter change resolves the contradiction by introducing a simple priority metric that significantly improves charging efficiency without requiring complex control algorithms.
Solution Approach 2:
The patent applies local quality by treating each power storage element differently based on its specific user demand characteristics. Instead of uniform treatment, each element receives customized power allocation according to its priority value, which reflects local user needs. This allows the system to optimize charging for each element individually while maintaining overall system simplicity.
2Productivity
If electric power is distributed based on user demands with priority values, then charging efficiency improves, but the control system complexity increases
Solution Approach 1:
The patent introduces a priority value parameter that quantifies user demand (such as remaining time or target state of charge). This single parameter simplifies the control logic by reducing complex user demands to a comparable numerical value, allowing efficient power distribution through simple arithmetic operations rather than complex optimization algorithms.
Solution Approach 2:
The system allows each power storage element to effectively 'self-determine' its power allocation based on its priority value. The control device simply distributes power according to these pre-established priority values without needing complex real-time optimization, reducing control system complexity while maintaining charging efficiency.
3Productivity
If the state of charge varies significantly among power storage elements, then individual element performance is optimized, but overall system balance deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring the state of charge of each power storage element and adjusting the priority values accordingly. Elements with lower state of charge can be assigned higher priority to receive more power, while elements with higher state of charge receive less power. This feedback mechanism automatically balances the system while allowing individual elements to perform optimally.
Solution Approach 2:
The priority values are not static but dynamically adjusted based on the current state of charge and user demands. This dynamic adjustment allows the system to respond to changing conditions, optimizing individual element performance while maintaining overall system balance through flexible power distribution.
Data Source
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AI summary
A power reception control method for a power storage element controls element-receiving electric power received by the power storage element (EV) in an electric power system for supplying electric energy to a load group (11) including plural power storage elements (EV) via an electric power supply base point (10). The power reception control method acquires differential electric power by subtracting a current value of total transmitted electric power from a maximum value of the total transmitted electric power that is an available amount to be supplied to the entire load group (11) via the electric power supply base point (10), calculates a degree of priority of the power storage element (EV) in accordance with a numerical value indicating a demand of a user of the power storage element (EV), multiplies the differential electric power by the degree of priority of the power storage element (EV) to calculate element differential electric power, and adds the element differential electric power to the previous element-receiving electric power so as to update the element-receiving electric power.