Battery Droop Curve Control for SOC Equalization
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Solution Overview
Problem
Power supply systems face inefficiencies in charging and discharging batteries due to varying state of charge (SOC) levels among batteries, which can lead to unstable energy supply and reduced battery lifespan if not managed properly.
Innovation Solution
A power supply system that sets a system droop curve for multiple batteries based on their SOC levels, with a charging control unit controlling charging and discharging operations to maintain frequency stability and equalize SOC levels, using either preset data or current system frequency to determine the droop curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If batteries with varying SOC levels are charged/discharged without unified droop curve management, then individual battery operation flexibility is maintained, but system frequency stability deteriorates and charging/discharging efficiency is reduced
Solution Approach 1:
The system dynamically adjusts the droop curve parameters based on the SOC levels of individual batteries. The system control unit modifies the droop characteristics (slope and reference frequency) according to real-time SOC information, allowing each battery to operate at optimal efficiency points while collectively maintaining system frequency stability. This parameter adaptation resolves the contradiction by enabling both efficient individual operation and stable system performance.
2Reliability
If a unified droop curve is set for all batteries, then system frequency stability is improved, but differences in individual battery SOC levels lead to suboptimal charging/discharging efficiency
Solution Approach 1:
The droop curve is transformed from a static unified setting to a dynamic adaptive mechanism. The system control unit continuously monitors SOC levels and adjusts the droop curve characteristics in real-time, creating a dynamic balance between system stability requirements and individual battery efficiency needs. This dynamic approach allows the same droop curve structure to serve different batteries at different operational states optimally.
3Duration of action of stationary object
If SOC levels are not equalized among batteries, then individual battery operation autonomy is maintained, but battery lifespan is reduced due to unstable energy supply
Solution Approach 1:
The system implements a feedback mechanism where the system control unit continuously obtains SOC level information from each battery and uses this feedback to adjust the droop curve settings. This closed-loop control ensures that batteries with lower SOC levels receive appropriate charging priority while preventing overcharging, thereby equalizing SOC levels over time and extending battery lifespan without requiring complex manual management interventions.
Data Source
AI summary
Disclosed is a power supply system. A power supply system according to an embodiment includes a system control unit configured to set a first system droop curve for a plurality of batteries and a charging control unit configured to control charging/discharging of the plurality of batteries on the basis of the first system droop curve.