Prony算法下电力系统低频振荡模态辨识研究  

Study on low-frequency oscillation mode identification of power system based on Prony algorithm

作　　者：李建青 潘文明 沈思 杜海红 刘士李 LI Jianqing;PAN Wenming;SHEN Si;DU Haihong;LIU Shili(State Grid Anhui Economic Research Institute,Hefei 230031,China;State Grid Anhui Electric Power Company,Hefei 230022,China)

机构地区：[1]国网安徽省电力有限公司经济技术研究院,安徽合肥230031 [2]国网安徽省电力有限公司,安徽合肥230022

出　　处：《电子设计工程》2025年第4期110-113,118,共5页Electronic Design Engineering

基　　金：安徽省电力公司科技项目(521609230031)。

摘　　要：当存在电量信号错误拟合行为时,电网主机无法识别出低频振荡行为,导致电力系统发生混乱。针对上述情况,文中提出Prony算法下电力系统低频振荡模态辨识研究。选择Prony参数,推导出Prony算法表达式,求解低频模态量,完成基于Prony算法的电力信号低频模态分析。在低频信号振荡区间内,处理电力系统低频振荡的定阶情况,并设置具体的模态辨识条件,实现对电力系统低频振荡模态的辨识。通过实验进行验证,结果表明,错误拟合行为前电量信号低频振荡波曲线始终保持较为稳定的数值状态,低频振荡波的波幅为2.9 mm,应用所研究方法可以识别出电力信号的低频振荡行为,该方法不会导致电力系统混乱。When there is a misfitting behavior of power signal,the power grid host can’t identify the low-frequency oscillation behavior,which leads to chaos in the power system.In view of the above situation,this paper puts forward the research on low-frequency oscillation mode identification of power system under Prony algorithm.Select Prony parameters,derive the expression of Prony algorithm,solve the low-frequency modal quantity,and complete the low-frequency modal analysis of power signal based on Prony algorithm.In the low-frequency signal oscillation interval,the order determination of low-frequency oscillation of power system is handled,and specific modal identification conditions are set to realize the identification of low-frequency oscillation modes of power system.Through the experimental verification,the results show that the low-frequency oscillation wave curve of the power signal always keeps a relatively stable numerical state before the misfitting behavior,and the amplitude of the low-frequency oscillation wave is 2.9 mm,and it is concluded that the low-frequency oscillation behavior of the power signal can be identified by using the studied method,and this method will not cause chaos in the power system.

关 键 词：PRONY算法 电力系统 低频振荡 信号定阶 错误拟合 

分 类 号：TN99[电子电信—信号与信息处理]