Power Supply System Distribution Mode Control
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Solution Overview
Problem
Existing power supply systems that determine distribution ratios based solely on available charge and discharge energies may lead to suboptimal efficiency, resulting in excessively limited dischargeable or chargeable power, especially when electrical storage devices have different power supply characteristics.
Innovation Solution
A power supply system with an electronic control unit that sets a desired distribution mode based on the magnitude relations between rates of change in dischargeable and chargeable power relative to the charge state value of each electrical storage device, ensuring that power is distributed to optimize overall system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distribution ratios are determined based solely on the ratio of available charge energies or available discharge energies, then the control method is simple, but the dischargeable power or chargeable power of the overall power supply system becomes excessively limited
Solution Approach 1:
The patent changes the control parameter from simple energy ratio to a composite parameter that includes both energy ratio and rate of change of power. Specifically, the distribution ratio is determined based on (1) the ratio of available charge energies or available discharge energies, and (2) the magnitude relation between the rate of change of dischargeable power or chargeable power and the charge state value. This parameter expansion resolves the contradiction by enabling higher productivity while maintaining manageable control complexity through a systematic multi-parameter approach.
Solution Approach 2:
The patent introduces dynamic adjustment of distribution ratios by considering the rate of change of power with respect to charge state value. Instead of using a static energy-ratio-based distribution, the system dynamically adapts the distribution ratio based on how quickly power limits are approached. This dynamic control allows the system to maximize dischargeable/chargeable power while preventing excessive limitation, resolving the contradiction between productivity and control complexity.
2Productivity
If distribution ratios are determined based solely on the ratio of available charge energies or available discharge energies, then the control method is simple, but the efficiency of the overall power supply system does not become optimal
Solution Approach 1:
The patent expands the control parameter from simple energy ratio to include both energy ratio and the rate of change of power characteristics. By determining distribution ratios based on (1) available energy ratios and (2) the magnitude relation between power change rate and charge state value, the system achieves optimal efficiency while maintaining systematic control, resolving the contradiction between productivity and control complexity.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the charge state values and power limits of individual electrical storage devices, and adjusting the distribution ratio accordingly. The system uses the magnitude relation between the rate of change of power and charge state value as feedback to optimize efficiency dynamically, resolving the contradiction between achieving optimal system efficiency and maintaining manageable control complexity.
3Productivity
If the charge state value at which dischargeable power begins to be limited is not the same among all electrical storage devices, then individual device characteristics differ, but uniform distribution ratio determination based solely on available discharge energies excessively limits overall dischargeable power
Solution Approach 1:
The patent applies local quality by tailoring the distribution ratio determination to individual device characteristics. Instead of using a uniform energy-ratio-based approach, the system considers the specific rate of change of dischargeable power with respect to charge state value for each device. This allows the system to adapt to different device characteristics while maximizing overall dischargeable power, resolving the contradiction between productivity and adaptability.
Solution Approach 2:
The patent introduces dynamic adaptation to individual device characteristics by using the rate of change of power as a key parameter. The distribution ratio is dynamically adjusted based on how each device's power limit changes with charge state, allowing the system to accommodate different device characteristics without excessive limitation of overall dischargeable power, resolving the contradiction between productivity and adaptability.
Data Source
AI summary
A power supply system includes a plurality of electrical storage devices, a distributor configured to distribute electric power between the plurality of electrical storage devices in a desired distribution mode, and an electronic control unit. The electronic control unit configured to (i) set the desired distribution mode based on at least one of a magnitude relation between first rates of change in dischargeable power of the corresponding electrical storage device to a charge state value indicating a remaining level of charge of the corresponding electrical storage device, or a magnitude relation between second rates of change in chargeable power of the corresponding electrical storage device to the charge state value, and (ii) control the distributor such that electric power is distributed in the set distribution mode.