Leader-free distributed control method and system for multi-power-generation-unit cluster microgrid

By adopting a leaderless distributed control method in a multi-bus DC microgrid system, the communication and secondary voltage stabilization compensation terms of the bus-side controller are used to solve the problems of large communication burden and poor flexibility in the prior art, and the effects of current sharing and voltage stabilization are achieved.

CN120357476APending Publication Date: 2025-07-22SHANDONG UNIV
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Patent Information

Application Number
CN202510702041.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-28
Publication Date
2025-07-22

AI Technical Summary

Technical Problem

The existing multi-bus DC microgrid system has the problem of large communication burden and poor flexibility in distributed control, especially when the leader node fails, the current proportional sharing and voltage stability cannot be achieved.

Method used

The leaderless distributed control method is adopted to calculate the dynamic expected voltage value and sag terms in real time through communication between bus-side controllers, and combine the secondary voltage stabilization compensation terms to realize the accumulation and input of the bus voltage reference value to ensure the voltage tracking reference value.

Benefits of technology

The current sharing and global voltage stability between the busbars and the power generation units within the busbars are realized, and the flexibility of the system and power distribution efficiency are improved.

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Abstract

The invention provides a leader-free distributed control method and system for a multi-power-generation-unit cluster microgrid, and the method comprises the steps: enabling different bus-side controllers to communicate with each other, enabling each bus-side controller to obtain the information of an adjacent bus-side controller, and calculating the dynamic expected voltage value of each bus in real time; for each power generation unit in the cluster of the bus, calculating a droop item in real time according to the ideal proportion of the power generation unit; according to the calculated droop item, the controller at the converter of the power generation unit obtains the information of the controller of the adjacent converter, and a secondary voltage stabilization compensation item is estimated in real time through a dynamic average consistency algorithm; and on the basis of the calculated dynamic expected voltage value, the droop item and the secondary voltage stabilization compensation item, accumulating and summing the dynamic expected voltage value, the droop item and the secondary voltage stabilization compensation item to obtain a bus voltage reference value, and inputting the obtained bus voltage reference value into a voltage and current double-loop control link, so that the bus voltage tracks the bus voltage reference value.
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