Method and device for evaluating local inertia supporting capability of new energy delivery type AC / DC power system

By establishing a parameterized differential-algebraic equation model and a hybrid automata model, the problem of spatiotemporal heterogeneity of inertia in AC/DC power systems for new energy transmission was solved, enabling accurate identification and risk assessment of weak inertia regions and improving the accuracy and predictive ability of system stability assessment.

CN121906497APending Publication Date: 2026-04-21TSINGHUA UNIVERSITY +1
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Patent Information

Application Number
CN202511840427.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-08
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

Traditional methods cannot identify and assess the spatiotemporal heterogeneity of inertia in AC/DC power systems that transmit new energy sources to other regions, which leads to the inability to accurately identify areas with weak local inertia support capabilities, and consequently causes HVDC commutation failure or protection malfunction.

Method used

A parameterized differential-algebraic equation model of new energy power generation equipment including synchronous generator and converter interface is established. The inertia distribution matrix is ​​derived using the generalized energy framework. Combined with the hybrid automata model, the dynamic evolution trend of the inertia weak region is predicted, and the mapping relationship between inertia support capacity and commutation failure risk of high voltage DC converter station is evaluated.

Benefits of technology

It enables accurate identification and risk assessment of areas with weak local inertia support capacity, reveals the direct link between inertia distribution and DC stability, can predict future risk trends, and provides stability margin assessment.

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Abstract

The invention provides a method and device for evaluating the local inertia supporting capacity of a new energy delivery type AC / DC power system, and relates to the technical field of power system operation and control, and the method comprises the steps: building a parameterized differential-algebraic equation model; deriving an inertia distribution matrix of the power system by using a generalized energy framework, and calculating a local inertia supporting capability index of each network node based on the inertia distribution matrix; determining the network region of which the index value is lower than a preset index threshold value as an inertia weak region, and predicting the dynamic evolution trend of the inertia weak region based on a hybrid automaton model to obtain a prediction result; and establishing a mapping relation between the inertia supporting capability of the inertia weak area and the commutation failure risk of the high-voltage direct-current converter station, and evaluating the stability margin of the system. According to the method provided by the invention, the problem that the inertia space-time heterogeneity cannot be identified and evaluated by a traditional method can be solved, and accurate identification and risk evaluation of a region with weak local inertia supporting capability can be realized.
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