Weak power grid simulation method and system based on alternating current power grid simulation source

By using an AC power grid simulation source-based method and employing parameter presets and the SOGI-Q algorithm, a highly efficient and flexible weak power grid simulation was achieved, solving the problems of high hardware costs and low flexibility, and ensuring the accuracy and stability of power grid simulation.

CN120951560APending Publication Date: 2025-11-14HEFEI KEWELL POWER SYST CO LTD
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Patent Information

Application Number
CN202511066183.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-31
Publication Date
2025-11-14

AI Technical Summary

Technical Problem

Existing technologies require additional hardware investment when simulating weak power grids, resulting in high costs and low flexibility. Furthermore, real power grid testing may affect factory production.

Method used

A weak grid simulation method based on an AC power grid simulation source is adopted. By pre-setting weak grid parameters, the system capacity and grid angular frequency are solved, the line impedance is decomposed, the SOGI-Q discretization algorithm is used to solve the lead current, and the output voltage is obtained by combining the vector diagram to realize the simulation of the weak grid.

Benefits of technology

It reduces hardware investment costs, improves simulation flexibility, can accurately control grid voltage phase and suppress high-order harmonics, requires no physical RLC network, and is adaptable to different weak grid scenarios.

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Abstract

The invention discloses a weak power grid simulation method and system based on an alternating-current power grid simulation source, belongs to the technical field of weak power grids, and solves the problems of extra hardware investment, high cost and low flexibility in existing weak power grid simulation. Comprising the steps of presetting weak power grid parameters, solving system capacity and power grid angular frequency according to the weak power grid parameters, solving line impedance and decomposing impedance, obtaining an output voltage expression based on a vector diagram, solving lead current based on an SOGI-Q discretization algorithm, and solving output voltage in combination with the output voltage expression. According to the method, voltage drop caused by the fact that load current passes through line impedance and phase deviation caused by difference of power grid impedance angles are comprehensively considered, the port voltage is directly and dynamically calculated on the basis of an SOGI-Q discretization algorithm in combination with a vector diagram, the phase is accurately controlled, higher harmonics are restrained, and hardware dependence and hardware loss are reduced; the port voltage can be adjusted in real time along with the load current and the preset short circuit ratio, different weak power grid scenes can be adapted, and the flexibility is high.
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Citation Information

Patent Citations

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