Method, device and medium for coordinating multi-mode operation of ac-dc hybrid microgrid

CN122118726APending Publication Date: 2026-05-29CRRC ZHUZHOU ELECTRIC LOCOMOTIVE RESEARCH INSTITUTE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CRRC ZHUZHOU ELECTRIC LOCOMOTIVE RESEARCH INSTITUTE CO LTD
Filing Date
2024-11-27
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies in AC/DC hybrid microgrid systems suffer from power instability and voltage and current transients during grid-connected and off-grid mode switching, and lack effective energy management strategies to cope with changes in power demand, affecting the system's power quality and operational safety.

Method used

By monitoring the microgrid's operating status in real time and dynamically adjusting the control strategies of the bidirectional AC/DC converter and the energy storage bidirectional DC/DC converter, the coordinated control of the photovoltaic-storage-charging integrated system is optimized through the adoption of power outer loop control and DC bus voltage monitoring, thereby achieving smooth mode switching and power flow adjustment.

Benefits of technology

It effectively reduces voltage and current transient impacts during mode switching, improves system stability and power quality, enhances dynamic response capability and energy utilization efficiency, and ensures efficient system operation in various modes.

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Abstract

The present application relates to a kind of AC-DC hybrid microgrid multi-mode operation coordination control method, equipment and medium.The method includes receiving operating mode switching instruction, control bidirectional AC / DC converter and energy storage bidirectional DC / DC converter adjustment power flow.If switch to off-grid mode, disconnect high-voltage AC power grid connection, build low-voltage AC and DC bus through energy storage;If switch to grid-connected mode, reconnect power grid after checking AC400V stability.During switching process, active and reactive power are adjusted according to real-time data of DC bus voltage and AC frequency.After switching, control strategy is adjusted according to microgrid state, and the method realizes smooth switching and adapts to operating demand.
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