Equivalent three-region interconnected power system frequency full response model analysis method

By constructing a frequency full response model for an equivalent three-zone interconnected power system, the problem of insufficient consideration of spatiotemporal distribution characteristics and initial states of dynamic components in existing frequency response analytical methods is solved, enabling rapid and accurate characterization of the spatiotemporal evolution trajectory of frequency and frequency security analysis.

CN122118787APending Publication Date: 2026-05-29DALIAN UNIV OF TECH
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Patent Information

Application Number
CN202610568478.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-28
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing frequency response analytical methods are unable to reflect the spatiotemporal distribution characteristics of frequency when dealing with complex spatial and temporal dynamic characteristics, and fail to strictly consider the initial state of dynamic components at the moment of disturbance. This results in mathematical description gaps in the model at the point of change of operating conditions, making it difficult to achieve accurate trajectory capture of the entire response process.

Method used

An equivalent three-zone interconnected power system frequency full response model is constructed. By taking into account the initial state of dynamic components before disturbance in the single-unit frequency full response model, and simplifying the interconnected system network structure based on DC power flow, regional equivalent aggregation and order reduction processing are performed. Combined with the modal superposition method, the frequency full response model of the three-zone system is established.

Benefits of technology

It enables rapid and accurate characterization of the spatiotemporal evolution trajectory of frequencies in large-scale interconnected power grids, avoiding gaps in mathematical description. It is applicable to the security analysis of large disturbance frequencies in three-zone interconnected power systems, with fast calculation speed and clear physical meaning.

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Abstract

The invention discloses an equivalent three-region interconnected power system frequency full response model analysis method, and belongs to the field of power system frequency stability analysis and control. The method comprises the following steps: firstly, establishing a single-machine frequency full-response model to obtain a dynamic equation and parameter expression of the single-machine frequency full-response model; secondly, frequency space-time distribution characteristics and tie line power exchange influences are considered, an interconnection system network structure is simplified based on direct current power flow, area equivalent aggregation and order reduction processing is carried out on the basis of three-area division of a disturbance area and a non-disturbance area, and a three-area system equivalent frequency response model is established; and finally, constructing a three-region system frequency full response model, and solving to obtain an analytical expression of the frequency difference of each region. The method can accurately describe the system frequency full response process, reflects the frequency space-time distribution characteristics and the inter-region tie line power exchange influence, is suitable for large disturbance frequency safety analysis of the three-region interconnected power system, and has the advantages of being high in calculation speed, clear in physical significance and convenient for online rapid evaluation.
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