An ac-dc hybrid distribution network partition autonomous and mutual aid operation method based on flexible multi-state switch

By using a three-dimensional dynamic zoning index system and dynamic virtual impedance decoupling control, combined with model-predicted fault recovery strategies, the problem of zoning control and fault recovery in AC/DC hybrid distribution networks with a high proportion of distributed power sources has been solved, achieving efficient and stable zoning autonomy and mutual assistance operation.

CN122553419APending Publication Date: 2026-08-11YICHANG POWER SUPPLY CO OF STATE GRID HUBEI ELECTRIC POWER CO LTD
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Patent Information

Application Number
CN202610706057.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-21
Publication Date
2026-08-11

AI Technical Summary

Technical Problem

In scenarios where a high proportion of distributed power sources are integrated into existing AC/DC hybrid distribution networks, the zone control and flexible multi-state switch (SOP) operation strategies suffer from limitations such as static zoning, severe power coupling, insufficient autonomy and mutual assistance, low fault recovery efficiency, and high communication dependence.

Method used

By adopting a three-dimensional dynamic zoning index system, dynamic virtual impedance decoupling control, and model prediction fault recovery strategy, and by dynamically adjusting the zoning boundaries through an improved Louvain community discovery algorithm, combined with dynamic virtual impedance and model prediction control, the autonomous and mutually supportive operation of the AC/DC hybrid distribution network is realized, reducing communication dependence.

Benefits of technology

It improves the system's adaptability and stability, increases the capacity utilization of SOPs, shortens fault recovery time, reduces communication dependence, protects data privacy, and enhances the system's operating efficiency and reliability.

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Abstract

This invention belongs to the field of AC / DC hybrid distribution network operation and control technology. A method for autonomous and mutual-assistance operation of AC / DC hybrid distribution networks based on flexible multi-state switches includes the following steps: Step S1: Calculate the comprehensive stability index of each node; Step S2: Monitor the comprehensive stability index in real time; Step S3: In the autonomous mode, the SOP within each zone adopts an AC / DC power decoupling control strategy based on dynamic virtual impedance; Step S4: When the power deficit of a zone exceeds a preset proportion of the zone's rated load and the duration exceeds a preset time threshold, the mutual-assistance mode is activated; Step S5: When a system fault occurs, a fault recovery strategy based on model predictive control is adopted; Step S6: Monitor the communication status between the global coordination unit and the control units of each zone in real time. This achieves safe, stable, efficient, and economical system operation, reduces communication dependence, and improves power supply reliability.
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