DC Power Supply Controller Battery Segmentation Strategy
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Solution Overview
Problem
In standalone DC power supplying systems not connected to commercial power, the control device risks falling into an inoperable state when the storage battery voltage falls to a lower limit voltage at night, leading to potential system restart failures and inefficient use of battery discharging capability.
Innovation Solution
A DC power supplying system with a controller that prioritizes maintaining the SOC of a specified storage battery higher than others, using bidirectional converters to manage power distribution, ensuring the specified battery operates the controller and stops other batteries from supplying power when their SOC reaches a lower limit, thereby extending the system's operational time and preventing over-discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control device operates continuously using storage battery power during nighttime, then the independent operation function is maintained, but the storage battery voltage falls to a lower limit causing the control device to become inoperable
Solution Approach 1:
The patent divides the storage battery system into multiple batteries (first storage battery and second storage battery). The control device operates on the first storage battery while the second storage battery supplies power to the load. This segmentation allows the control device to switch to the second battery when the first battery voltage drops, preventing inoperability while maintaining continuous operation.
Solution Approach 2:
The system performs preliminary charging of the second storage battery during daytime when solar power is available. This preliminary action ensures that when nighttime arrives and the first battery voltage drops, the second battery is already charged and ready to take over power supply to the load, preventing control device inoperability.
2Duration of action of moving object
If all storage batteries are used for power supply during nighttime, then the operating time is extended, but the controller may fall into an inoperable state when voltage drops
Solution Approach 1:
The patent segments the power supply function between the first storage battery (for controller operation) and the second storage battery (for load power supply). This segmentation extends the overall system operating time by utilizing the second battery's capacity while maintaining controller operability through the first battery's dedicated power supply.
Solution Approach 2:
The control device acts as an intermediary that manages power distribution between the two storage batteries and the load. It monitors the voltage of the first storage battery and switches power sources appropriately, ensuring that the controller remains operational while extending system operating time through coordinated battery usage.
3Quantity of substance
If the storage battery is discharged to the discharging limit voltage, then the power capacity is fully utilized, but the system cannot operate independently when voltage falls below the operating limit
Solution Approach 1:
The patent segments the power capacity utilization between two storage batteries. The second battery can be discharged to its limit for load power supply, while the first battery maintains voltage above the operating limit for controller operation. This segmentation allows full power capacity utilization without compromising independent operation capability.
Solution Approach 2:
The system performs preliminary charging of the second storage battery during daytime using solar power. This preliminary action enables the second battery to be fully discharged during nighttime for load power supply without affecting the first battery's ability to maintain controller operation, thus fully utilizing power capacity while ensuring independent operation capability.
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
This configuration effectively extends the time the controller remains operational and ensures efficient use of battery power, preventing over-discharge and maintaining system functionality by prioritizing the specified battery's power for controller operation and using other batteries for DC bus supply until they reach a lower limit.
Implementation Method 1
a solar cell, a storage battery, a power converter
Implementation Method 2
DC power stored in storage batteries is converted to power to be used in place of the grid power
Data Source
AI summary
An energy management system (controller) operates on a charging voltage Vba of a specified storage battery out of storage batteries to control power converting operations by bidirectional DC/DC converters. The energy management system controls the power converting operations of the respective bidirectional DC/DC converters so that the SOC of the specified storage battery is always higher than the SOCs of the other storage batteries, executes supplying of power from the other storage batteries to the DC bus with priority over supplying of power from the specified storage battery to the DC bus, and causes the corresponding bidirectional converters to stop the supplying of power from the other storage batteries the DC bus when the SOCs of the storage batteries have fallen below a lower limit value set in advance due to the supplying of power to the DC bus.