A grid strength evaluation-based grid-following / grid-forming switching control method

By constructing a multi-dimensional power grid strength assessment and dynamic switching decision-making, and designing a smooth transition control strategy, the problem of incomplete power grid strength assessment in power plant grid connection control is solved, and stable coordinated operation of the power grid and power plants is achieved.

CN122436971APending Publication Date: 2026-07-21DATANG YUNCHENG POWER GENERATION CO LTD
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Patent Information

Application Number
CN202610486022.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-14
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The existing power plant grid connection control mode suffers from problems such as incomplete grid strength assessment, inaccurate judgment of switching timing, large impact during the switching process, and poor control effect after switching, which leads to instability in the operation of the power grid and power plants.

Method used

By building a power grid and power plant status monitoring system, real-time data is collected and outliers are removed. A multi-dimensional comprehensive evaluation index of power grid strength is constructed, the timing of switching is dynamically determined, and a smooth transition control strategy and adaptive parameter optimization mechanism are designed to achieve accurate and stable switching between grid-connected and grid-building modes.

Benefits of technology

It achieves accurate characterization of the power grid state, ensures that the control mode matches the power grid operating conditions, reduces switching impact, improves the smoothness and safety of the switching process, and ensures the continuity and reliability of the control effect.

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Abstract

The application discloses a grid strength evaluation-based follow-grid-construct-grid switching control method and specifically relates to the control field, and comprises the following steps: S1, a power grid and power plant state monitoring system is built, and core parameters required for control are initialized; S2, power grid and power plant operation data are collected in real time through the monitoring system, and key deviation parameters are obtained based on effective data; S3, a power grid strength comprehensive evaluation index containing a dynamic correction term is constructed through multidimensional analysis; S4, an operation state adaptability index is constructed through safety and stability analysis; and S5, a switching discrimination function is constructed based on the power grid strength comprehensive index and the operation state adaptability index, and a follow-grid-construct-grid switching time is dynamically decided. Through construction of the power grid strength comprehensive evaluation index which integrates a short-circuit ratio, a voltage support coefficient and a frequency stability coefficient, the application realizes accurate depiction of the power grid state, provides a reliable basis for switching decision, and improves the matching degree of the control mode and the power grid working condition.
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