A common dc bus energy storage system with balanced output

By adjusting the overvoltage and undervoltage thresholds of the DC/DC in the common DC bus energy storage system, the problem of SOC imbalance between subsystems is solved, simultaneous charging and discharging is achieved, and the charging and discharging efficiency and stability of the system are improved.

CN119231592BActive Publication Date: 2025-10-17CONTEMPORARY NEBULA TECH ENERGY CO LTD
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Patent Information

Application Number
CN202411216943.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-17
Publication Date
2025-10-17
Estimated Expiration
2042-08-17

AI Technical Summary

Technical Problem

Due to the long distance between the subsystems in the common DC bus energy storage system, the line length differences and DC/DC voltage sampling errors make it impossible to achieve simultaneous charging and discharging, resulting in increasingly worse SOC imbalance and affecting charging and discharging efficiency.

Method used

By initializing the voltage sampling value in the energy storage system and adjusting the overvoltage threshold and undervoltage threshold of the DC/DC according to the voltage sampling value, the subsystem that charges/discharges first stops working, and the remaining subsystems continue to charge/discharge until all subsystems are balanced and restored to the initial voltage range, achieving simultaneous charging and discharging.

Benefits of technology

It effectively avoids SOC imbalance between subsystems, improves the utilization efficiency of the common DC bus energy storage system, and ensures stable operation of the system.

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Abstract

The present invention provides a common DC bus energy storage system with balanced output, including multiple energy storage subsystems, each of which is composed of an electrical cabinet, a DC / DC, an AC / DC, and an EMS system. Each EMS system is independent of each other and communicates complementary with each other. The subsystems are connected in parallel by sharing a DC bus. The DC bus of the entire energy storage system is sampled by the DC / DC of each subsystem, and the voltage of the DC bus is established and maintained by the DC / DC of each subsystem. Each subsystem can independently transmit power to the DC bus, and then output it to its respective load via the AC / DC to the power grid. The energy scheduling of the entire process is controlled by the EMS system. The present invention can effectively solve the problem that the SOC balance of each subsystem is getting worse and worse due to the inability of the energy storage system to charge and discharge at the same time.
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