Energy Storage Deadband Control for Battery Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Energy storage systems face limitations in efficiently operating within the deadband of desired control values due to the scheduling operations based on power price variations, leading to unnecessary battery control operations and suboptimal energy management.
Innovation Solution
An energy storage system incorporating a battery management system (BMS) and a power condition system (PCS) that monitors battery state and calculates a deadband value based on power market adjustment rules to control charging and discharging operations, ensuring the battery maintains a state of charge within the desired control value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the energy storage system performs scheduling operations based on power price variations to maintain desired control values, then the system can reduce power usage costs by charging during low-price periods and discharging during high-price periods, but the system fails to use the deadband for desired control values and repeats unnecessary battery control operations
Solution Approach 1:
The patent applies dynamics by making the control target dynamic through the deadband mechanism. Instead of maintaining a fixed desired control value, the system dynamically adjusts the acceptable range (deadband) around the target value. The battery control operates only when the state of charge exits this dynamic range, adapting to changing conditions and avoiding rigid, unnecessary control actions.
Solution Approach 2:
The patent changes the control parameter from a single fixed value to a range defined by the deadband. By introducing the deadband parameter (upper and lower limits around the desired control value), the system transforms the control approach from precise point-maintenance to range-based operation, reducing unnecessary control operations while maintaining effective power price arbitrage.
2Adaptability or versatility
If the energy storage system continuously adjusts battery operations to maintain the desired control value, then the system can respond to power price changes effectively, but unnecessary repeated control operations occur because the deadband is not utilized
Solution Approach 1:
The deadband provides dynamic tolerance around the desired control value, allowing the system to adapt to power price changes while filtering out minor fluctuations that would trigger unnecessary control operations. The control system remains adaptable to significant price changes but ignores minor variations within the deadband range.
Solution Approach 2:
The system applies partial action by not responding to every deviation from the desired control value. Instead of correcting every minor fluctuation, the system only acts when the state of charge exits the deadband range, performing control operations only when necessary rather than continuously.
3Ease of operation
If the energy storage system uses scheduling operations based only on power price, then the system can simplify control logic, but the system fails to operate within the deadband and performs unnecessary repeated control operations
Solution Approach 1:
The deadband introduces a dynamic element to the otherwise simple price-based control logic. The control system remains relatively simple but gains the ability to filter unnecessary operations through the deadband mechanism, improving efficiency without significantly complicating the control structure.
Solution Approach 2:
The deadband acts as an intermediary layer between the simple price-based control signal and the battery control execution. It mediates by filtering out unnecessary control commands while allowing necessary ones through, improving efficiency without requiring complex control logic.
Data Source
AI summary
An energy storage system is provided. The energy storage system including a battery includes a battery management system (BMS) monitoring a battery state of the battery and controlling charging and discharging operations of the battery; and a power condition system (PCS) determining a desired control value of the battery, obtaining power market adjustment rule information on a power market including the energy storage system, calculating a deadband value for the desired control value based on the obtained power market adjustment rule information, and controlling the BMS controlling the charging and discharging operations of the battery based on the calculated deadband value for the desired control value and the monitored battery state.