Transient stability analysis method for grid-connected system

By establishing a model of a heterogeneous new energy grid-connected system and calculating the stable manifold, the problem of the inability of existing technologies to accurately describe the global stability of the system under high new energy penetration conditions is solved. This enables precise characterization and visualization analysis of the transient stability domain, thereby improving the system's safety and stability analysis capabilities.

CN121036010APending Publication Date: 2025-11-28国网陕西省电力有限公司 +1
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Patent Information

Application Number
CN202511338578.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-18
Publication Date
2025-11-28

AI Technical Summary

Technical Problem

Existing transient stability analysis methods cannot accurately describe the global stability region of a system under conditions of high new energy penetration, are difficult to characterize the nonlinear effects and parameter sensitivity of the stability domain, and lack comparative analysis of different control strategies.

Method used

A mathematical model of a heterogeneous new energy grid-connected system is established. The stable manifold is calculated by numerical integration or numerical extension. Combined with Jacobian matrix eigenvalue analysis and scalar functions, the boundary of the transient stability domain is characterized, thereby achieving a global and accurate characterization of the system stability.

Benefits of technology

It achieves a global and accurate characterization of the transient stability domain, enhances the interpretability of system stability, and provides an effective analytical tool for the safe and stable operation of high-penetration renewable energy grid-connected systems.

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Abstract

The invention provides a transient stability analysis method for a grid-connected system. The method comprises the following steps: establishing a mathematical model of a heterogeneous new energy grid-connected system comprising a network construction type new energy unit, a network following type new energy unit, a synchronous generator and a receiving end power grid, and defining a state variable set of the system; solving a stable equilibrium point and an unstable equilibrium point of the system according to the operation condition of the system; and by taking the unstable equilibrium point as a starting point, calculating by adopting a numerical integration method or a numerical continuation method to obtain a stable manifold starting from the unstable equilibrium point. The method provided by the invention realizes global and accurate depiction of the transient stability domain, overcomes the defects that a traditional small signal linearization method can only analyze local stability and a traditional energy function method depends on an artificial construction function and is limited in applicability, fundamentally changes an analysis normal form of the transient stability domain, and improves the analysis accuracy of the transient stability domain. And a more effective analysis tool is provided for safe and stable operation of the high-permeability new energy grid-connected system.
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