电力系统自动化2025，Vol.49Issue(7)：57-67,11.DOI:10.7500/AEPS20230914006
系统小扰动初期交变电气量的幅频调制特征及解调方法
Amplitude-Frequency Modulation Characteristics and Demodulation Method of Alternating Electrical Variables in Initial Stage of System Small-disturbance
摘要
Abstract
During the dynamic process of system oscillation occurring after disturbances in the power electronics dominated system,the unbalanced power at device ports drives the adjustment of amplitude/frequency(A/F)of the the internal voltage,subsequently altering the AC voltage/current in the network,so each alternating electrical variable evolves in the form of its A/F being modulated.The A/F modulation process of the formation and evolution of the AC signal leads to profound changes in its oscillation characteristics.Therefore,this paper aims to clarify the oscillation characteristics of the AC signal based on the formation and evolution mechanism of the A/F modulation of the AC signal and proposes a demodulation method for the corresponding signal feature extraction.Firstly,according to the basic principle of system operation,this paper introduces the A/F modulation mechanism of AC signals during the dynamic process of the system small-disturbance,clarifying the A/F modulation characteristics that determine the formation and evolution of AC signals during the intial stages of the oscillation process.Subsequently,it proposes a demodulation method and its implementation measures for extracting the A/F modulation characteristics of AC signals.Finally,by combining different scales of simulations and experiments,the rationality of the modulation formation and evolution mechanism of AC signals during system dynamic processes is verified,along with the effectiveness of the proposed demodulation method for feature extraction.关键词
小扰动动态过程/幅频调制/振荡/解调Key words
small-disturbance dynamic process/amplitude/frequency(A/F)modulation/oscillation/demodulation引用本文复制引用
吴鹏辉,王思成,袁小明..系统小扰动初期交变电气量的幅频调制特征及解调方法[J].电力系统自动化,2025,49(7):57-67,11.基金项目
国家电网有限公司科技项目(5100-202199548A-0-5-ZN) （5100-202199548A-0-5-ZN）
This work is supported by State Grid Corporation of China(No.5100-202199548A-0-5-ZN). （No.5100-202199548A-0-5-ZN）
