Method for constructing small-signal model of wind-solar-thermal integrated power generation system

WO2026130125A1PCT designated stage Publication Date: 2026-06-25ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID QINGHAI ELECTRIC POWER COMPANY +2

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Patent Information

Authority / Receiving Office: WO · WO
Patent Type: Applications
Current Assignee / Owner: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID QINGHAI ELECTRIC POWER COMPANY
Filing Date: 2025-12-04
Publication Date: 2026-06-25

AI Technical Summary

Technical Problem

Existing technologies lack stability analysis of integrated wind and solar thermal power generation systems, especially the problem of reduced grid strength caused by electromagnetic oscillations inside solar thermal power plants and the negative damping characteristics of wind power bases.

Method used

A small-signal model of a wind-solar-thermal integrated power generation system is constructed, including frequency domain small-signal models of solar thermal generators, permanent magnet direct-drive wind turbines, equivalent current sources, and equivalent power grids. Bode plot analysis is used to determine the system stability.

Benefits of technology

It effectively reflects the dynamics of wind power and solar thermal integrated power generation systems, simplifies the grid connection stability analysis of large-scale wind power and solar thermal integrated power generation systems, solves the electromagnetic oscillation problem, and improves the accuracy of system stability judgment.

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Abstract

A method for constructing a small-signal model of a wind-solar-thermal integrated power generation system. The method comprises: constructing a time-domain small-signal model of a solar thermal power generation unit, and on the basis of the time-domain small-signal model of the solar thermal power generation unit, establishing a frequency-domain small-signal model of the solar thermal power generation unit (S11); constructing a time-domain small-signal model of a permanent magnet direct-drive wind turbine generator unit, and on the basis of the time-domain small-signal model of the permanent magnet direct-drive wind turbine generator unit, establishing a frequency-domain small-signal model of the permanent magnet direct-drive wind turbine generator unit (S12); constructing a frequency-domain small-signal model of an equivalent current source and a frequency-domain small-signal model of an equivalent power grid (S13); and establishing a small-signal model of a wind-solar-thermal integrated power generation system (S14).

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