Charge/Discharge Management for Battery SoC Control
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Solution Overview
Problem
The service life of storage batteries, particularly lithium-ion batteries, is affected by unstable State of Charge (SoC), leading to unreasonable operation and performance degradation when used to stabilize power supply in power generation systems that rely on fluctuating natural energy sources like sunlight and wind.
Innovation Solution
A charge/discharge management device is integrated into power generation equipment, connecting power generation systems with storage battery systems to stabilize power supply by adjusting charge/discharge commands based on detected power fluctuations and storage battery information, ensuring the State of Charge (SoC) targets are maintained within optimal ranges to minimize degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the storage battery is charged and discharged frequently to stabilize power supply fluctuations, then the power supply stability is improved, but the service life of the storage battery deteriorates due to unstable SoC
Solution Approach 1:
The invention changes the control parameter from direct power stabilization to SoC-based control. By monitoring and controlling the SoC within a specific range (not allowing it to drop below a predetermined threshold), the system stabilizes power supply while preventing excessive charge/discharge cycles that would degrade the battery. This parameter change resolves the contradiction by finding an optimal operating window for SoC.
Solution Approach 2:
The invention implements a feedback control mechanism where the SoC is continuously monitored and used to adjust charge/discharge commands. When SoC approaches the lower threshold, the system reduces discharge or increases charge to maintain SoC within the safe range. This feedback loop ensures both power stability and battery protection simultaneously.
2Stability of the object's composition
If the storage battery capacity is increased to handle larger power fluctuations, then the power supply stabilization capability is improved, but the device complexity and cost increase
Solution Approach 1:
The invention makes the charge/discharge control dynamic by adjusting commands based on real-time SoC conditions rather than using a fixed capacity battery. The control strategy adapts to fluctuating power conditions by modulating charge/discharge rates, allowing a smaller battery to achieve the same stabilization effect that would otherwise require a much larger fixed-capacity battery.
Solution Approach 2:
By changing the control approach from capacity-based to SoC-based control, the invention optimizes the utilization of the existing battery capacity. Instead of oversizing the battery to handle all possible fluctuations, the system uses intelligent control to maximize the effectiveness of the available capacity, reducing the need for larger, more complex battery systems.
Data Source
AI summary
A charge/discharge management device is provided in power generation equipment including a power generation system in which generated power fluctuates and a storage battery system and connected to a power system. The power generation system includes a power meter that detects the generated power. The storage battery system includes a storage battery, a battery management unit that monitors a state of the storage battery, and a power conditioning system. The charge/discharge management device includes a charge/discharge command unit that determines charge/discharge commands for the power conditioning system on the basis of the generated power detected by the power meter and storage battery information supplied from the battery management unit, such that a system supply power change rate is within a fluctuation range of ±n %, and an SoC of the storage battery approaches an SoC target value.