Frequency-support-oriented parameter optimization and cooperative control method for virtual synchronous machine of rural island micro-grid

By constructing a standard dynamic model of a virtual synchronous machine and an integrated design for uncertainty, the problem of frequency instability caused by weak communication and dynamic load changes in rural isolated microgrids was solved, achieving frequency support and rapid coordinated control, and improving system stability and response capability.

CN121546738APending Publication Date: 2026-02-17GUIZHOU POWER GRID CO LTD
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Patent Information

Application Number
CN202511777917.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-28
Publication Date
2026-02-17

AI Technical Summary

Technical Problem

In rural isolated microgrids with a high proportion of renewable energy access, the weak communication infrastructure and the dynamic changes in load create a sharp contradiction. Existing technologies cannot eliminate cross-VSG communication dependence, nor can they achieve rapid coordination under protection constraints, leading to frequent frequency instability accidents.

Method used

By acquiring network and load parameters, a standard dynamic model of a virtual synchronous machine is constructed. Uncertainty integrated design is introduced, and a frequency-supported optimization and collaborative control model is established. A commercial solver is used to solve for the equipment power, thereby realizing distributed parameter optimization and collaborative control.

Benefits of technology

It effectively suppresses the problems of frequency offset and frequency change rate exceeding the limit, improves the dynamic response capability of islanded microgrids under load change conditions, meets relay protection requirements, and reduces deployment costs and implementation threshold.

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Abstract

The invention discloses a village island micro-grid virtual synchronous machine parameter optimization and cooperative control method oriented to frequency support, and relates to the technical field of electrical automation, and the method comprises the steps: obtaining village power distribution network parameters and load side parameters, and basic technical parameters of each virtual synchronous machine unit; constructing a standard dynamic model of the virtual synchronous machine based on the obtained parameters; introducing uncertainty integrated design on the basis of the standard dynamic model of the virtual synchronous machine, and performing equivalent aggregation on all the virtual synchronous machines to obtain a virtual synchronous machine uncertainty model; based on the uncertainty model of the virtual synchronous machine, establishing a cooperative control model by taking system frequency fluctuation minimization as a target; and solving the cooperative control model by using a commercial solver, and solving the power of each device. According to the invention, by constructing an optimization and cooperative control mechanism oriented to frequency support, the problem of over-limit of frequency deviation and frequency change rate is effectively suppressed, and the dynamic response capability of the island micro-grid under the condition of sudden load change is improved.
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