Battery String Control Architecture for Scalable Power Allocation
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Solution Overview
Problem
Large-scale electricity storage systems with numerous storage battery strings and batteries require efficient power management to prevent control complexity and processing load.
Innovation Solution
A storage battery control device with multiple first control units for individual battery strings and a second control unit for system communication, managing power distribution and preventing processing overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of storage battery strings and batteries are provided in a large-scale electricity storage system, then the power management capability and storage capacity are improved, but the control complexity and processing load increase significantly
Solution Approach 1:
The control device is segmented into a hierarchical structure with a first control unit for each storage battery string and a second control unit for overall system coordination. This segmentation allows distributed control at the string level while maintaining centralized management, thereby managing complexity in large-scale systems with numerous batteries.
Solution Approach 2:
The first control units act as intermediaries between the individual storage battery strings and the second control unit. Each first control unit manages its respective string's auxiliary devices and communicates with the second control unit, which handles system-level charge/discharge coordination. This intermediary structure prevents processing overload by distributing control functions.
2Ease of operation
If individual control of each storage battery string is implemented, then the power management precision and control flexibility are improved, but the processing load of the control device increases
Solution Approach 1:
Control functions are segmented between first control units (handling individual string operations like auxiliary device control) and the second control unit (handling system-level charge/discharge power allocation). This segmentation enables flexible individual string control while distributing processing load to prevent overload.
Solution Approach 2:
The first control units handle only the specific auxiliary device control for their respective strings, while the second control unit handles the partial function of allocating charge/discharge power. This partial action approach ensures sufficient control flexibility without excessive processing load on any single control unit.
Data Source
AI summary
A storage battery control device includes a plurality of first control devices that are provided respectively for strings and configured to control a string auxiliary device, and a second control device configured to communicate with the plurality of first control devices and a host server outside an electricity storage system. The first control device is configured to acquire information on states of the strings and transmit the information to the second control device. The second control device is configured to calculate an instruction value of charge and discharge power assigned to each of strings based on an instruction value of charge and discharge power of the electricity storage system received from the host server and information on the states of the strings received from the plurality of first control devices, and transmit the instruction value of charge and discharge power to the first control devices.