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

作　　者：吴鹏辉 王思成 袁小明[2] WU Penghui;WANG Sicheng;YUAN Xiaoming(Hangzhou Power Supply Company of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]国网浙江省电力有限公司杭州供电公司,浙江省杭州市310007 [2]华中科技大学电气与电子工程学院,湖北省武汉市430074

出　　处：《电力系统自动化》2025年第7期57-67,共11页Automation of Electric Power Systems

基　　金：国家电网有限公司科技项目(5100-202199548A-0-5-ZN)。

摘　　要：电力电子化系统在受扰后发生振荡的动态过程中,设备在端口不平衡功率驱动下调节其输出的内电势幅值、频率,进而改变网络交变电压、电流,各交变电气量均以其幅值和频率被调制的形式演化。该交流信号形成和演化的幅频调制过程导致其振荡特征发生了深刻变化。因此,基于交流信号形成演化的幅频调制机制明确了系统小扰动动态过程初期交流信号的振荡特征,并提出相应信号特征的提取方法。首先,基于系统基本运行原理,介绍了系统动态过程中交流信号的幅频调制机制,明确决定交流信号在振荡过程初期演化行为的幅频调制特征;然后,提出了提取该交流信号幅频调制特征的解调方法及其具体实现措施;最后,结合不同规模的仿真及实验,分析并验证了系统动态过程中交流信号幅频调制形成演化机制的合理性及所提解调方法的有效性。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 

分 类 号：TM712[电气工程—电力系统及自动化]