A thermal power unit low-frequency oscillation analysis and suppression system and method

The low-frequency oscillation analysis and suppression system for thermal power units, which integrates multi-data fusion and a unified electrothermal model, solves the problems of insufficient simulation accuracy and control conflicts in existing technologies. It achieves high-precision oscillation identification and rapid suppression, thereby improving the safety and stability of thermal power units.

CN120414685BActive Publication Date: 2026-07-03이너 몽골리아 일렉트릭 파워 그룹 컴퍼니 리미티드 이너 몽골리아 일렉트릭 파워 리서치 인스티튜트 브랜치
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
이너 몽골리아 일렉트릭 파워 그룹 컴퍼니 리미티드 이너 몽골리아 일렉트릭 파워 리서치 인스티튜트 브랜치
Filing Date
2025-06-10
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing low-frequency oscillation analysis and suppression technologies for thermal power units rely on simplified electrical models and single signal sources, resulting in limited simulation accuracy and an inability to accurately identify complex oscillation modes. Traditional suppression strategies are difficult to adapt to dynamic operating conditions, and the coordination of control systems is insufficient, which can easily lead to control conflicts. Signal fusion technology also suffers from timing misalignment problems.

Method used

By introducing multi-data fusion technology, electrical and non-electrical signals are collected, time alignment and feature splicing are performed, a unified electrothermal model is constructed, simulation analysis is conducted, and combined with variable prediction model and iterative thresholding deep network, online identification and classification of oscillation type are realized, and CCS, DEH, AVR and PSS control systems are triggered in a coordinated manner.

Benefits of technology

It improves the accuracy and suppression efficiency of low-frequency oscillation analysis, reduces the risk of misjudgment, shortens the oscillation suppression time, and enhances the safe and reliable operation of thermal power units.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides a system and method for analyzing and suppressing low-frequency oscillations in thermal power units. It eliminates timing discrepancies between electrical and non-electrical signals through a time alignment module, and achieves dynamic matching of frequency domain and statistical characteristics through an eigenvalue splicing module, significantly improving data fusion accuracy. Based on a real-time simulation-based unified electrothermal model, it quantifies the impact of unit thermal changes on electrical damping, supporting precise oscillation mode tracing. Simultaneously, a collaborative suppression mechanism is designed, synchronously triggering multi-module linkage of CCS, DEH, AVR, and PSS based on classification and grading results, avoiding control conflicts and improving suppression efficiency. By introducing multi-criteria fusion and dynamic threshold adjustment, it enhances the online identification capability of complex oscillation types, ultimately achieving high-precision analysis and rapid suppression of low-frequency oscillations, providing reliable assurance for the safe operation of thermal power units.
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