Adaptive Current Limiting for Weak-Grid Power Supply Stability
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Solution Overview
Problem
Power systems in remote locations experience excessive voltage drops due to long distances from power transformers, leading to input undervoltage and repeated restarts, which can cause malfunctions and power failures.
Innovation Solution
A power supply method that adaptively adjusts the current limit value of the power system based on input voltage, allowing it to supply power while avoiding undervoltage by determining whether the power grid is weak and adjusting the current limit value accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between the power system and power transformer is increased to serve remote loads, then the coverage area is improved, but the voltage drop increases causing input undervoltage and repeated restarts
Solution Approach 1:
The patent implements dynamic adjustment of the current limit value based on real-time input voltage monitoring. The power system automatically increases the current limit when input voltage drops due to long transmission distance, allowing higher output current to compensate for voltage drop and maintain stable power delivery to remote loads without repeated restarts.
Solution Approach 2:
The patent changes the operational parameter (current limit value) of the power system based on the transmission distance and input voltage conditions. By adjusting this parameter dynamically, the system adapts to long-distance transmission scenarios while maintaining reliable power supply and avoiding undervoltage lockout.
2Power
If the current limit value is manually increased to supply sufficient power to loads, then the power supply capability is improved, but the input voltage drops below undervoltage point causing repeated restarts
Solution Approach 1:
The patent implements a feedback mechanism where the power system continuously monitors its input voltage and automatically adjusts the current limit value in response. When input voltage drops, the system increases the current limit to maintain power output, and when voltage recovers, it reduces the limit back to normal, creating a closed-loop control that prevents repeated restarts while ensuring adequate power supply.
Solution Approach 2:
The power system performs self-adjustment of its current limit parameter without external intervention. The system automatically detects undervoltage conditions and modifies its own operational parameters to maintain stable operation, eliminating the need for manual configuration and enabling adaptive response to changing load and grid conditions.
3Reliability
If the current limit value is manually decreased to avoid undervoltage, then the power supply stability is improved, but the power supply capability becomes insufficient causing power failures under heavy load
Solution Approach 1:
The patent transforms the static current limit configuration into a dynamic parameter that automatically adapts to operating conditions. The system maintains power supply stability by adjusting the current limit in real-time based on input voltage, ensuring both stability and adequate power capability are achieved simultaneously rather than requiring a fixed compromise.
Data Source
AI summary
Embodiments of this application provide a power supply method and apparatus, an electronic device, and a readable storage medium. The method includes: determining whether a current power grid is a weak power grid; if the current power grid is a weak power grid, determining a target current limit value based on an actual input voltage of a power system; and supplying power to a load based on the target current limit value. The power system may adaptively adjust a current limit value of the power system based on an input voltage, so as to supply power to the load while avoiding undervoltage in the power system.