Battery Rack Power Distribution for SOC-Balanced Energy Storage
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Solution Overview
Problem
Existing energy storage systems face challenges in controlling individual battery racks in DC-coupled systems, particularly in distributing power based on the state of charge (SOC) and health (SOH), leading to inefficiencies and reduced system stability due to differences in battery characteristics.
Innovation Solution
A power distribution method that collects information on each battery rack and DC/DC converter, sets power commands based on type, state, and capacity, and performs charge/discharge control to stabilize SOC levels across racks, recalculating commands when limits are exceeded to ensure efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a central DC/DC converter is applied to a DC-coupled battery system, then power conversion between DC battery system and AC grid is enabled, but individual battery racks cannot be controlled properly
Solution Approach 1:
The patent divides the centralized DC/DC converter into multiple distributed DC/DC converters, with each converter connected to a specific battery rack. This segmentation enables independent control of each battery rack while maintaining the DC-coupled system architecture, resolving the contradiction between centralized power conversion and individual rack controllability.
Solution Approach 2:
The patent introduces a hierarchical control structure with two dimensions: the power conversion dimension (DC/DC converters for each rack) and the control dimension (controller receiving SOC signals and distributing power commands). This dimensional separation allows independent optimization of both power conversion efficiency and individual rack control capability.
2Productivity
If power is distributed without considering SOC differences, then system operation is simplified, but SOC deviations between battery racks increase
Solution Approach 1:
The patent implements a feedback mechanism where the controller receives SOC (State of Charge) signals from each battery rack, processes this information, and generates appropriate power distribution commands. This closed-loop feedback ensures that power distribution considers the actual charge states of individual racks, preventing excessive SOC deviations while maintaining efficient system operation.
Solution Approach 2:
The patent employs dynamic power distribution that adjusts power commands in real-time based on changing SOC conditions. The controller continuously monitors SOC levels and modifies power distribution strategies accordingly, enabling the system to adapt to varying operational conditions and maintain stability without sacrificing efficiency.
3Device complexity
If battery racks with different types and SOH ranges are operated uniformly, then control complexity is reduced, but battery lifespan and performance are compromised
Solution Approach 1:
The patent applies local quality by tailoring power distribution commands to the specific characteristics of each battery rack. The controller considers individual rack properties such as type and SOH (State of Health) ranges when generating power commands, allowing each rack to operate within its optimal performance envelope rather than applying uniform control to all racks.
Solution Approach 2:
The patent dynamically adjusts operational parameters (power commands) based on battery rack characteristics including type and SOH range. By changing these parameters according to individual rack conditions, the system optimizes both lifespan and performance without requiring overly complex control mechanisms, achieving a balance between simplicity and effectiveness.
Data Source
AI summary
Please amend the Abstract of the Disclosure with the attached Abstract. A power distribution method in an energy storage system including a plurality of battery racks and a plurality of DC/DC converters connected to each corresponding battery rack may include collecting information about each battery rack and information about each DC/DC converter; setting a power command for each battery rack according to a type and a state of each battery rack; and performing charge/discharge control for each battery rack according to the set power command for each battery rack.