Virtual AC power transmission network construction method and system for power grid MTDC

By building a virtual node center star topology and optimizing virtual impedance parameters, the power regulation lag problem of multi-terminal DC transmission system in dynamic scenarios is solved, fast response and efficient power distribution are achieved, system stability and reliability are improved, loss calculations are simplified, and loss calculations are employed, and good scalability is achieved.

CN120511705APending Publication Date: 2025-08-19HUAZHONG UNIV OF SCI & TECH +1
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Patent Information

Application Number
CN202510953311.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-10
Publication Date
2025-08-19

AI Technical Summary

Technical Problem

In dynamic scenarios, existing multi-terminal DC transmission systems have power outage problems caused by power regulation lag and communication interruption. Especially when new energy output suddenly changes or load changes suddenly, the MMC-MTDC system under the traditional master-slave control architecture is difficult to respond quickly.

Method used

Build a virtual node center star (VNCS) topology, optimize virtual impedance parameters by introducing virtual node o and virtual line reactance xio, realize efficient coordination and dynamic allocation of multi-terminal power, use the allocation coefficient kj to dynamically optimize the remaining capacity, build an ideal transformer to match voltage, and form a virtual AC transmission network.

Benefits of technology

Implement power adaptive adjustment of multi-end flexible straight systems within the millisecond time scale, quickly respond to dynamic scenarios, improve system stability and reliability, simplify loss calculation, reduce equipment loss and maintenance costs, and have good scalability.

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Abstract

The invention provides a virtual AC power transmission network construction method and system for a power grid MTDC, and the method comprises the steps: generating N physical nodes according to a common coupling point PCC of an N-end modular multilevel converter MMC, constructing a virtual node o, determining a voltage amplitude and a phase angle of the virtual node o according to the operation state of the physical nodes, each physical node forms a power relation through the virtual node o; connecting each physical node with the virtual node o through a virtual line reactance xio so as to construct a power transmission relation between each physical node and the virtual node o and realize dynamic power distribution and mutual aid among the physical nodes; an ideal transformer with the transformation ratio kio is constructed to achieve voltage matching of the MMC at each end, and the transformation ratio kio is the ratio of the reference voltage of the MMC at the i-th end to the reference voltage of the MMC at the N-th end. According to the method, virtual node center star topology construction is realized.
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