Grouped Battery Power Allocation for Fewer Charge-Discharge Switches
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Solution Overview
Problem
Existing power coordination control methods for multiple energy storage units, such as centralized control, face challenges in scalability, reliability, and flexibility, especially when dealing with the volatility and intermittency of renewable energy sources, leading to inefficient operation and reduced regulation ability of energy storage systems.
Innovation Solution
A grouped consensus power allocation method is proposed, where multiple battery energy storage units are grouped into charging and discharging groups and communicate through a distributed algorithm, allowing for autonomous cooperative control and adaptive power coordination without a central control center, using a weighted-consensus algorithm to ensure power constraints are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If centralized control mode is used for power coordination among multiple energy storage units, then control simplicity is improved, but system reliability and scalability deteriorate due to control center failure risks and communication bottlenecks
Solution Approach 1:
The patent divides the centralized control system into multiple distributed control agents, each responsible for local decision-making. Each energy storage unit is equipped with an independent control agent that can autonomously make control decisions based on local information and consensus with neighboring agents, eliminating the single point of failure in centralized control while maintaining coordinated operation across the system.
Solution Approach 2:
The control agents are designed to be self-sufficient, each possessing the capability to make control decisions independently without relying on a central control center. Each agent uses local state information and consensus algorithms to determine optimal control actions, enabling the system to maintain functionality even when individual agents or communication links fail.
2Ease of operation
If centralized control mode is used for power coordination among multiple energy storage units, then control simplicity is improved, but scalability and flexibility deteriorate due to large calculation amounts and communication bottlenecks
Solution Approach 1:
The control functionality is segmented and distributed across multiple independent agents rather than concentrated in a single control center. Each agent handles local computation and decision-making, allowing the system to scale by simply adding more agents without overloading a central processor. This distributed architecture enables flexible expansion while maintaining control simplicity through standardized agent behaviors.
3Ease of operation
If power allocation does not consider state differences among energy storage units, then control simplicity is improved, but operation economy and regulation ability deteriorate
Solution Approach 1:
The control agents are designed to incorporate local state information (such as SOC levels, capacity, and operational status) into their decision-making processes. Each agent adjusts its control strategy based on its own state and the states of neighboring agents, ensuring that power allocation considers individual unit characteristics. This enables differentiated control that optimizes operation economy and regulation ability while maintaining distributed control simplicity.
Data Source
AI summary
A grouped consensus power allocation method for multiple energy storage units is provided, including determining a grouped coordination control strategy of multiple battery energy storage units (BESUs) of a BESS (battery energy storage system), where the multiple BESUs are communicated through a communication topology and grouped into a charging group and a discharging group, performing power coordination control power coordination control between the charging group and the discharging group based on a distributed algorithm, determining whether a switching between the charging group and the discharging group is triggered during an operation process of the BESS, and switching when it is triggered. The method can reduce the number of charging/discharging state conversions of the BESUs, prolong the service life of energy storage, ensure that the power allocation results meet the power constraints of the BESUs, reduce low-power operation times of the BESUs, and improve the efficiency of energy storage operation.