Battery String Bypass Coordination for Distributed Converter Control
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Solution Overview
Problem
Large-scale power storage systems face excessive processing loads when controlled by a single controller, and cooperative control among storage battery strings is difficult to implement when multiple controllers are used.
Innovation Solution
A storage battery control device with multiple first control devices for each storage battery string and a second control device that sets charge and discharge power or current values, acquires information on string states, and transmits bypass control information to manage power converters and bypass circuits across the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single controller controls all power converters and bypass switch units, then cooperative control among storage battery strings is achieved, but the processing load on the controller becomes excessive
Solution Approach 1:
The control system is segmented into a central control device that manages bypass circuits and individual string control devices that manage power converters. This segmentation distributes the processing load while maintaining cooperative control through centralized bypass management.
Solution Approach 2:
The central control device acts as an intermediary that coordinates between multiple storage battery strings. It receives state information from all strings, makes bypass control decisions, and transmits control instructions to individual string controllers, enabling cooperative control without overwhelming any single controller.
2Productivity
If multiple controllers are provided for storage battery strings, then processing capacity is ensured, but cooperative control among storage battery strings becomes difficult
Solution Approach 1:
Multiple string control devices are merged under the coordination of a central control device. Each string controller maintains independent processing capacity while the central controller merges their state information and coordinates bypass control to achieve system-wide cooperative control.
Solution Approach 2:
The central control device receives feedback information on states of all storage battery strings from individual controllers. Based on this feedback, it generates coordinated bypass control instructions and transmits them back to the string controllers, enabling adaptive cooperative control.
3Adaptability or versatility
If a large number of bypass switch units are controlled, then system adaptability is improved, but the processing load increases excessively
Solution Approach 1:
Control of bypass switch units is segmented and distributed to individual string control devices, which execute bypass control locally based on instructions from the central controller. This reduces the processing load on any single device while maintaining system adaptability.
Solution Approach 2:
Each storage battery string controller independently manages its own bypass switch units based on local state information and central coordination instructions. This self-service approach distributes processing requirements while maintaining overall system adaptability.
Data Source
AI summary
A system controller acquires information on states of a plurality of storage battery strings, and based on the information, transmits bypass control information for controlling bypass switch units to string controllers. The plurality of string controllers control power converters of the corresponding storage battery strings according to charge and discharge power values or charge and discharge current values of the storage battery strings set by the system controller, and control the bypass switch units of the corresponding storage battery strings according to the bypass control information transmitted from the system controller.