A fault simulation calculation method and system of a network-constructed wind turbine access system

By employing a virtual synchronous machine control strategy and iterative calculation method for grid-connected inverter power supplies, the problem that traditional grid fault analysis cannot adapt to grid-connected wind turbine access is solved, achieving high-precision fault simulation calculation and supporting real-time simulation testing of new energy access systems.

CN121980722BActive Publication Date: 2026-06-09SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG UNIV
Filing Date
2026-04-07
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Traditional power grid fault analysis methods cannot effectively consider the nonlinear response of power electronic equipment and the dynamic characteristics of multi-source collaborative interaction after the integration of new energy sources, resulting in poor accuracy of calculation results. In particular, for grid-connected wind turbine systems, it is impossible to obtain accurate electrical quantity distribution.

Method used

A virtual synchronous machine-type grid-type inverter power supply control strategy is adopted, and an equivalent fault model of the grid-type inverter power supply is established. By constructing a composite sequence network equivalent model and iterative calculation method, the output power characteristics of the inverter power supply are analyzed, active and reactive power simulation calculation models are established, and the fault electrical quantities are solved by solving the simultaneous loop equations.

Benefits of technology

It enables rapid fault simulation of grid-connected renewable energy access systems, improves calculation accuracy, adapts to network results of multiple distributed generation (DG) access and different distribution networks, improves the theoretical framework for short-circuit current simulation calculation, provides theoretical support for fault analysis and protection design of active distribution networks, and ensures the safe and reliable operation of the power grid.

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Abstract

This invention discloses a fault simulation calculation method and system for grid-connected wind turbine systems, relating to the field of power system fault simulation modeling. The grid-connected wind turbine includes the wind turbine generator body and a grid-connected inverter. Based on the control strategy of the grid-connected inverter, an active and reactive power simulation calculation model is established, followed by an equivalent model for faults in the grid-connected inverter. Based on the fault equivalent model, and according to the distribution network structure, a composite sequence network equivalent model is established under the fault conditions of the distribution network containing the grid-connected inverter. Based on the composite sequence network equivalent model, a set of loop equations composed of a generalized matrix is ​​obtained. The loop equations and the fault equivalent model of the grid-connected inverter are combined, and based on the output power and current characteristics of the grid-connected inverter, and the constraints of the power-voltage relationship, an iterative calculation method is used to solve for the fault quantities. This solves the problem that traditional fault analysis and calculation methods based on synchronous power supplies cannot adapt to grid-connected wind turbine scenarios.
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