A multi-dc bus low-voltage flexible dc networking device and a control method thereof

CN114977258BActive Publication Date: 2026-06-05SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHEAST UNIV
Filing Date
2022-05-24
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

When new sources of load are connected to the existing power distribution network, there are random fluctuations in voltage and power flow, new energy sources cannot be absorbed in a timely manner, DC characteristics affect system efficiency, medium-voltage DC power distribution system equipment costs are high, and control methods are limited.

Method used

The system employs a multi-DC bus low-voltage flexible DC grid device, including two three-phase multi-winding transformers and multiple AC/DC and DC/DC converters. Through control methods, it achieves DC voltage droop control and fault protection, forming a pseudo-bipolar low-voltage DC bus. Photovoltaic and energy storage modules are connected through DC/DC converters, enabling flexible regulation and rapid fault recovery.

Benefits of technology

It enables convenient access and local consumption of new energy sources, reduces equipment wear, improves system operating efficiency, enhances system flexibility and reliability, and quickly recovers from non-busbar short-circuit faults.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of multi DC bus low voltage flexible DC networking device and its control method, it is related to low voltage DC power distribution technical field, multi DC bus low voltage flexible DC networking device includes 2 multi-winding transformer, multiple AC / DC converters and DC / DC converters, 2 multi-winding transformer high voltage side is connected two sides AC feeder respectively, and low voltage side multi-winding is set different voltage grade according to DC bus demand, and is connected each AC / DC converter, and AC / DC converter DC output side one-to-one corresponding series connection constitutes multiple DC bus, photovoltaic, energy storage, DC load is accessed each DC bus by DC / DC converter, and energy storage is according to voltage information hysteresis comparison signal and SOC state determines droop control coefficient to carry out DC voltage droop control, when short-circuit fault occurs in system DC side, control system can select corresponding fault recovery strategy according to different fault position.
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