Transient stability boundary determination method and device of network construction type converter system and medium

By constructing a nonlinear autonomous system model and the theory of singularities at infinity, the problem of accurately quantifying the transient stability boundary in grid-connected systems of grid-connected converters is solved, thereby improving the stability assessment and security of the power grid under large disturbances.

CN120933931APending Publication Date: 2025-11-11NORTH CHINA ELECTRIC POWER UNIV
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Patent Information

Application Number
CN202511092508.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-05
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

Existing technologies lack accurate quantitative methods for determining transient stability boundaries in grid-connected converter systems, leading to insufficient stability assessment of power systems under large disturbances and affecting the safe operation of the power grid.

Method used

Based on the nonlinear autonomous system model of a grid-type new energy generator group, a locally stable manifold is constructed through Taylor expansion and local linearization. The transient stability boundary of the system is verified by combining the singularity theory at infinity. Numerical integration and the control variable method are used to optimize the parameters and generate a parameter optimization map.

Benefits of technology

It enables accurate quantification of the stability boundary of grid-connected converter systems under large disturbances, thereby improving the safety, stability, and fault assessment capabilities of the power grid.

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Abstract

The invention provides a transient stability boundary determination method and device of a network-forming converter system and a medium, and belongs to the technical field of transient stability boundary determination. The method comprises the following steps: constructing a nonlinear autonomous system model of a network construction type new energy generator group; solving all I-class unstable equilibrium points of the nonlinear autonomous system model; constructing a local stable manifold along the stable feature vector direction of the I-type unstable equilibrium point; constructing a global stable manifold of the I-type unstable equilibrium point; and combining global stability manifolds of all I-type unstable equilibrium points to form a transient stability boundary of the system, and verifying a closed state at an infinity position based on an infinity singular point theory. According to the method, through the constructed nonlinear autonomous system model, influence factors of a stability boundary and a stability domain after the system is subjected to large disturbance are researched based on a nonlinear stability manifold theory, and forms of a saddle point boundary line and a trajectory of the system at infinity are researched, so that the transient synchronization stability of the system is improved.
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