ESS Discharge Control Using State-of-Charge Ranking
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Solution Overview
Problem
Energy storage systems (ESS) face challenges in accurately managing power distribution due to varying states-of-charge across multiple energy storage units, leading to potential imbalances and failures in supplying energy to the grid, resulting in ineffective energy management and unreliable energy supply.
Innovation Solution
A processor-generated discharge control protocol accounts for the different states-of-charge of energy storage units, calculating individual discharge times and power levels to ensure the ESS can satisfy energy requests by ranking the units based on their capacity and state-of-charge, determining the optimal power levels and discharge times to maintain reliable energy supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the ESS distributes large amounts of energy across transmission lines using multiple energy storage units, then the power delivery capability is improved, but the state-of-charge imbalances between units worsen, leading to unreliable energy supply
Solution Approach 1:
The system segments the energy storage units into different operational groups based on their state-of-charge levels. Units with higher SOC are designated for discharge while units with lower SOC are designated for charge, creating segmented operational roles that prevent state-of-charge imbalances from compromising system reliability
Solution Approach 2:
The control system dynamically adjusts the operational status of each energy storage unit based on real-time state-of-charge measurements. Units transition between charging and discharging modes dynamically, allowing the system to adapt to changing conditions and maintain reliable energy supply while managing power distribution
2Ease of operation
If the ESS operates without state-of-charge dependent control, then the system operation is simpler, but the energy management accuracy deteriorates, resulting in ineffective energy management
Solution Approach 1:
The system implements feedback control by continuously monitoring the state-of-charge of each energy storage unit and using this information to adjust operational decisions. The control system receives SOC measurements, processes them through the determination logic, and adjusts charging/discharging commands accordingly, improving energy management accuracy while maintaining automated operation
Solution Approach 2:
The energy storage units automatically adjust their operational status based on their state-of-charge levels without requiring manual intervention. The system self-regulates by having units with high SOC automatically discharge and units with low SOC automatically charge, improving energy management accuracy while keeping the system operationally simple
Data Source
AI summary
The present disclosure provides systems and methods for providing power from an energy storage system (ESS). A method may include, for each of a plurality of energy storage units, calculating a length of time to complete discharge for the energy storage unit according to a rated power capacity of the energy storage unit and an amount of stored energy in the energy storage unit; determining a discharge control protocol for the plurality of energy storage units based on the calculated lengths of time to complete discharge, the discharge control protocol indicating a period of time to discharge power to an energy grid and an amount of power to discharge to the energy grid during the period of time; and discharging the plurality of energy storage units to the energy grid according to the discharge control protocol.