Battery Charge Scheduling for Renewable Output and Battery Life
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Solution Overview
Problem
The intermittent nature of renewable energy sources like solar and wind, combined with the degradation issues of lithium-based batteries when fully charged, poses challenges for grid interconnection, power quality, reliability, and energy storage, leading to inefficiencies and increased costs in energy management.
Innovation Solution
A method for coordinated control of renewable energy generation resources and energy storage devices using time-dependent forecasts and state of charge schedules to generate a time-varying charge/discharge control signal, ensuring optimal charging and discharging to meet SOC targets while adapting to production forecasts and market requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium-based batteries are charged to full capacity to maximize energy storage, then energy storage capacity is improved, but battery degradation accelerates
Solution Approach 1:
The patent implements dynamic state of charge (SOC) management that adjusts charging limits and discharge rates in real-time based on battery conditions, weather forecasts, and grid requirements. The system dynamically optimizes SOC targets and charging/discharging rates to balance energy storage capacity utilization with battery longevity, preventing both overcharging and excessive discharge cycles.
Solution Approach 2:
The system changes operational parameters including SOC thresholds, charging rates, and discharge rates based on predicted renewable energy generation and grid demand. By adjusting these parameters dynamically, the system maximizes energy storage when renewable generation is high while maintaining battery health through controlled charge/discharge operations.
2Productivity
If renewable energy generation increases to displace traditional base-load units, then environmental sustainability is improved, but grid stability and reliability deteriorate
Solution Approach 1:
The patent implements a feedback control system that continuously monitors renewable energy generation, battery state of charge, and grid conditions. The system uses weather forecasts and actual generation data to adjust battery charging/discharging operations in real-time, providing frequency regulation and voltage support to maintain grid stability as renewable penetration increases.
Solution Approach 2:
The battery energy storage system acts as an intermediary between intermittent renewable generation and the electrical grid. It absorbs excess renewable energy when generation exceeds demand and releases energy when generation is insufficient, smoothing out variations and providing stable power delivery to the grid.
3Reliability
If battery state of charge is maintained at high levels to ensure power availability, then power reliability is improved, but ability to absorb rapid power increases deteriorates
Solution Approach 1:
The system dynamically adjusts state of charge targets and charging rate limits based on predicted renewable generation profiles and grid conditions. When rapid power increases are forecasted, the system pre-charges the battery within safe limits; when the battery is already near full charge, the system adjusts operational parameters to accommodate the incoming power while maintaining grid reliability.
Data Source
AI summary
A method includes generating a time-varying charge/discharge control signal for an electrical storage device, wherein generating the time-varying charge/discharge control signal comprises identifying a prioritization order of a stack of simultaneously operating control modes, the stack of simultaneously operating control modes including a staging mode and at least two additional control modes, each control mode of the stack comprising a plurality of control signal candidate values; identifying an intersection of one or more control signal candidate values from the plurality of control signal candidate values of each control mode of the stack according to the prioritization order; and determining, based on the prioritization order, at least one time-varying charge/discharge control signal for the electrical energy storage device from the intersection of control signal candidate values.