Energy Storage Dispatch Control for Degradation Management
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Solution Overview
Problem
Energy storage systems face inefficiency and degradation due to varying operating conditions, such as capacity fade in sodium metal halide batteries at low discharge rates and resistance rise effects at high voltage recharge rates, leading to reduced lifespan.
Innovation Solution
A method and system for controlling the dispatch operation of energy storage systems by receiving data on the present dispatch state, identifying candidate dispatch states, and selecting a dispatch state based on a performance model that considers operating parameters like temperature, voltage, and contactor life to optimize energy storage unit coupling and decoupling, thereby reducing degradation and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If energy storage units operate at low discharge rates, then power delivery is maintained, but capacity fade occurs leading to reduced lifespan
Solution Approach 1:
The system dynamically adjusts the dispatch state of energy storage units based on real-time operating conditions. The controller monitors operating parameters and selectively couples or decouples units from the system, transitioning between different dispatch states to optimize both power delivery and lifespan by avoiding harmful operating conditions
Solution Approach 2:
The system changes operational parameters by selecting different dispatch states that specify which energy storage units are coupled to the system. The performance model evaluates candidate dispatch states based on operating parameters to determine optimal configurations that balance power delivery requirements with lifespan preservation
2Speed
If energy storage units operate at high voltage recharge rates, then charging speed is improved, but resistance rise effects occur leading to degradation
Solution Approach 1:
The controller dynamically transitions the system between different dispatch states based on real-time conditions. When high voltage recharge rates are detected as harmful, the system selectively decouples affected energy storage units from the system, thereby protecting them from degradation while maintaining overall system functionality
Solution Approach 2:
The performance model continuously evaluates candidate dispatch states based on operating parameters including conditions that indicate harmful effects. The system uses this feedback to select dispatch states that avoid high voltage recharge rates when they would cause resistance rise and degradation, while still meeting charging requirements
3Productivity
If the system monitors and adjusts dispatch states based on performance models, then efficiency and lifespan are improved, but system complexity increases
Solution Approach 1:
The system divides the energy storage system into multiple independently controllable units with discrete dispatch states. Each unit can be selectively coupled or decoupled from the system, allowing granular control that simplifies the management of complexity while enabling efficient optimization of overall system performance
Solution Approach 2:
The performance model creates a virtual representation of the system's operating conditions and evaluates candidate dispatch states in this model before implementing changes. This allows complex optimization calculations to be performed on the model rather than requiring complex real-time control hardware
Data Source
AI summary
Systems and methods of controlling a dispatch operation of an energy storage system are provided. In particular, a degradation value of a present dispatch state of an energy storage system can be determined. The present dispatch state can specify one or more energy storage units presently coupled to the system. The degradation value can be determined based at least in part on one or more operating parameters, such as temperature, open circuit voltage, charge or discharge current, and/or contactor life. The degradation value can then be compared against one or more degradation values associated with one or more candidate dispatch states. A dispatch state can then be selected based on the comparison. One or more energy storage units can be selectively coupled to the energy storage system based at least in part on the selected dispatch state.