Photovoltaic Panel Parallel Control for Safe Fast Charging
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Solution Overview
Problem
The charging speed of mobile energy storage devices using photovoltaic modules is slower compared to alternating current charging, and increasing the number of photovoltaic panels in parallel to enhance charging speed can lead to overcurrent or overvoltage issues, potentially damaging the battery and triggering protection mechanisms.
Innovation Solution
A charging control method that determines the estimated maximum output power of a photovoltaic module based on the number of parallel panels and their rated output, then adjusts the number of operating panels to ensure the charging power does not exceed the safe limits of the energy storage device, thereby preventing overcurrent and overvoltage while maximizing charging speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more photovoltaic panels are connected in parallel to increase charging power, then charging speed is improved, but overcurrent or overvoltage protection is triggered causing charging interruption
Solution Approach 1:
The system dynamically adjusts the number of operating photovoltaic panels based on real-time conditions. The control method monitors the charging state and automatically switches between different panel configurations (full parallel connection vs. reduced parallel connection) to optimize charging speed while preventing protection triggers, making the system adaptable rather than static
Solution Approach 2:
The invention changes the operational parameters of the photovoltaic module by switching between two different parallel connection configurations. The first configuration uses all panels for maximum speed, while the second configuration reduces the number of parallel panels to safe levels when protection risks are detected, thereby adjusting the electrical parameters to avoid overcurrent/overvoltage conditions
2Productivity
If more photovoltaic panels are connected in parallel to increase charging power, then charging speed is improved, but battery damage risk increases
Solution Approach 1:
The system takes preliminary protective action by detecting potential overcurrent or overvoltage conditions before they cause battery damage. The control method proactively switches to a reduced parallel connection configuration when protection risks are anticipated, preventing harmful effects before they occur rather than reacting after damage happens
Solution Approach 2:
The system dynamically adjusts the number of operating photovoltaic panels based on real-time conditions. The control method monitors the charging state and automatically switches between different panel configurations (full parallel connection vs. reduced parallel connection) to optimize charging speed while preventing protection triggers, making the system adaptable rather than static
Solution Approach 3:
The invention changes the operational parameters of the photovoltaic module by switching between two different parallel connection configurations. The first configuration uses all panels for maximum speed, while the second configuration reduces the number of parallel panels to safe levels when protection risks are detected, thereby adjusting the electrical parameters to avoid overcurrent/overvoltage conditions
3Productivity
If more photovoltaic panels are connected in parallel to increase charging power, then charging speed is improved, but system complexity increases
Solution Approach 1:
The photovoltaic module is segmented into multiple independent panel groups that can be selectively activated. Instead of controlling each panel individually, the system divides panels into manageable groups (first plurality and second plurality) that can be switched as units, reducing control complexity while maintaining the ability to adjust charging power
Solution Approach 2:
The invention changes the operational parameters of the photovoltaic module by switching between two different parallel connection configurations. The first configuration uses all panels for maximum speed, while the second configuration reduces the number of parallel panels to safe levels when protection risks are detected, thereby adjusting the electrical parameters to avoid overcurrent/overvoltage conditions
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
The method effectively balances charging speed and safety by dynamically adjusting the number of operating photovoltaic panels, reducing the risk of damage to the energy storage device and ensuring continuous, efficient charging.
Implementation Method 1
a combination of a photovoltaic module and a mobile energy storage device is widely used in scenarios such as outdoors, remote areas, construction sites, and rescue sites without power supply because a battery level of the mobile energy storage device can continue to be replenished with solar energy outdoors
Data Source
AI summary
A charging control method is provided. The method includes: determining, according to a quantity of parallel photovoltaic panels and a rated maximum output power of each photovoltaic panel, an estimated maximum output power of a photovoltaic module; determining, when the estimated maximum output power is greater than a maximum charging power of a target device, a maximum absolute safe photovoltaic panel parallel quantity Z of the photovoltaic module; operating Z photovoltaic panels, determining an actual maximum output power of each photovoltaic panel in the Z photovoltaic panels, and determining an actual maximum safe photovoltaic panel parallel quantity Y of the photovoltaic module according to the actual maximum output power of each photovoltaic panel in the Z photovoltaic panels and the maximum charging power; and increasing a quantity of operating photovoltaic panels according to Z and Y.