Series Battery Bus Voltage Reconfiguration Without DC-DC Converters
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Solution Overview
Problem
Current base station battery energy storage systems require costly DC-DC converters for voltage conversion, are high in construction and management costs, and have low efficiency due to the need for battery consistency.
Innovation Solution
A bus voltage modulation method for a series dynamic reconfiguration battery system that dynamically selects and combines battery modules based on their voltage values, using a software-defined technology to achieve desired bus voltage output through switch-on, switch-bypass, and voltage difference generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DC-DC converter blocks are used for voltage conversion, then voltage conversion capability is improved, but system cost and complexity increase
Solution Approach 1:
The patent extracts and removes the DC-DC converter blocks from the battery energy storage system. Instead of using active voltage conversion devices, the system directly connects battery strings in series to achieve voltage matching, eliminating complex power conversion equipment while maintaining voltage adaptability.
Solution Approach 2:
The patent replaces the electronic/mechanical DC-DC converter system with a software-controlled switching system. The voltage conversion function is achieved through software-defined dynamic reconfiguration of battery string connections rather than through physical power electronic converters.
2Adaptability or versatility
If DC-DC converter blocks are used for voltage conversion, then voltage conversion capability is improved, but construction and management costs increase
Solution Approach 1:
The patent removes expensive DC-DC converter blocks from the system architecture. By using direct series connection of battery strings controlled by software switching, the system eliminates the need for costly power electronic equipment, reducing both construction and ongoing management costs while maintaining voltage conversion capability.
Solution Approach 2:
The patent replaces expensive, complex DC-DC converters with simpler, lower-cost switching devices and control systems. The cost-effective approach uses standard battery management components rather than specialized power conversion equipment, significantly reducing system cost.
3Reliability
If battery consistency requirements are enforced, then voltage conversion reliability is improved, but battery utilization decreases
Solution Approach 1:
The patent implements dynamic reconfiguration of battery strings based on real-time voltage measurements. Instead of requiring all batteries to maintain strict consistency, the system dynamically adjusts which batteries are connected in series to achieve the target voltage, allowing batteries with varying states of charge to be effectively utilized while maintaining output reliability.
Solution Approach 2:
The patent changes the operating parameters of the battery system by allowing flexible voltage thresholds and dynamic reconfiguration. The system monitors battery voltages in real-time and adjusts the series connection configuration dynamically, enabling reliable operation without requiring strict battery consistency, thereby improving overall battery utilization.
4Adaptability or versatility
If DC-DC converter blocks are used, then voltage conversion capability is improved, but system efficiency decreases
Solution Approach 1:
The patent removes DC-DC converter blocks from the system, eliminating the energy losses associated with power electronic conversion. By using direct series connection of battery strings with solid-state switching, the system achieves voltage conversion with minimal energy loss, significantly improving overall system efficiency while maintaining voltage adaptability.
Data Source
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AI summary
The present disclosure discloses a bus voltage modulation method for a series dynamic reconfiguration battery system, and belongs to the technical field of energy storage for new energy power systems, comprising: numbering all battery modules as i, collecting a voltage value of each battery module, and arranging in a descending order according to magnitudes of the voltage values; selecting a battery module corresponding to the highest voltage value; determining whether the serial number i of the selected battery module is less than a total number N of series battery modules, if a determination result is YES, accumulating voltage values corresponding to the selected battery modules, and determining whether a voltage accumulation value of the battery modules is within a preset range; and performing an i++ operation according to the voltage accumulation value of the battery modules, and repeating the above content until an output bus voltage meets requirements for the preset range. A dynamic reconfiguration battery system based on a software-defined technology of the present disclosure can reconstruct and output a desired power bus voltage according to voltages of respective battery modules in real time to meet the requirements for the output power bus voltage.