Battery Storage Control Circuit Voltage Threshold Switching
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Solution Overview
Problem
Battery storage systems using natural energy converting units face instability due to fluctuations in output voltage, particularly during low sunlight conditions, cloudy weather, or at sunrise and sunset, which can lead to unstable operation of the control circuit.
Innovation Solution
A battery storage system with a host control circuit that manages power supply from a battery storage cell and commercial power system to ensure stable operation of the control circuit by setting specific voltage thresholds and margins, accumulating data to adjust these values based on output fluctuations, and prioritizing power sources based on state of charge and voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control circuit operates directly from the photovoltaic cell output, then the system structure is simple, but the control circuit becomes unstable when output voltage fluctuates below the sufficient level
Solution Approach 1:
The patent introduces a control circuit intermediary that includes a voltage detection unit and a switching unit. The voltage detection unit monitors the photovoltaic cell output voltage, and when it falls below a predetermined threshold, the switching unit automatically switches the power source from the photovoltaic cell to the battery storage cell, ensuring stable control circuit operation while maintaining relatively simple system structure
Solution Approach 2:
The patent implements preliminary voltage detection and automatic power source switching before the control circuit becomes unstable. The voltage detection unit continuously monitors the photovoltaic cell output, and the switching unit is pre-configured to switch to battery power when voltage drops below the threshold, preventing instability before it occurs
2Adaptability or versatility
If the output voltage threshold for control circuit operation is lowered to capture more sunlight conditions, then the system can operate during more conditions, but the control circuit becomes unstable during voltage fluctuations
Solution Approach 1:
The control circuit intermediary with voltage detection and automatic switching acts as a mediator that allows the system to adapt to various lighting conditions while maintaining stability. It enables operation during low-light conditions by switching to battery power when photovoltaic voltage is insufficient, thus expanding operating conditions without compromising control circuit stability
3Loss of energy
If the control circuit is always supplied with power from the photovoltaic cell, then the battery storage cell discharge is minimized, but the control circuit becomes unstable during low output voltage periods
Solution Approach 1:
The switching unit in the control circuit intermediary acts as an intelligent mediator that optimizes power source selection. It优先 uses photovoltaic cell power when voltage is sufficient (minimizing battery discharge) and automatically switches to battery storage cell power when photovoltaic voltage drops below the threshold (maintaining control circuit stability), thus balancing energy loss and reliability
Solution Approach 2:
The patent changes the power supply parameter dynamically based on photovoltaic cell output voltage conditions. When voltage is above the threshold, the system uses photovoltaic power; when voltage drops below the threshold, it switches to battery power. This parameter change strategy minimizes battery discharge during suitable conditions while ensuring stability when needed
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 solution enhances the stability of the battery storage system by preventing unstable operation of the control circuit during voltage fluctuations, reducing frequent power supply interruptions, and maintaining stable control of the battery storage cell and ACDC converter.
Implementation Method 1
a photovoltaic power generation module 11 configured to generate electrical power
Data Source
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AI summary
A battery storage system includes: an energy converting unit configured to generate electrical power; a power converter including a control circuit, and a circuit that is controlled by the control circuit to generate electrical power to be supplied from an output of the energy converting unit to a load and electrical power to be supplied to the control circuit; a power supply source including a battery storage cell and a commercial power system; and a host control circuit configured to perform control such that electrical power is supplied from the power supply source to the control circuit when an output of the energy converting unit is between a first value and a second value larger than the first value.