摘要
传统闪变检测方法以准确提取调幅波包络线为前提,过程复杂,运算量大。将TLS-ESPRIT法直接用于闪变检测,提出将电压闪变信号通过三角函数分解转化成间谐波信号,构成数据矩阵并进行奇异值分解(SVD),通过总体最小二乘法(TLS)求解旋转方程得到频率,用最小二乘法(LS)估计幅值,并由信号转化等式求得电压闪变信号的频率和幅值。针对被间谐波污染的闪变信号,提出根据双边带特性,检测间谐波频率并进行处理。仿真结果表明:直接检测闪变信号,估计信号参数,实现过程简单,运算量小,且TLS-ESPRIT法抗噪能力强,有效提高了低信噪比条件下闪变信号的检测精度。
Traditional voltage flicker method is based on the exact extraction of the envelope, the process is complex and the computational burden is heavy. Application of TLS-ESPRIT in estimation of voltage flicker is proposed in this paper. It decomposes the flicker signal into the interharmonic signal by trigonometric function and constructs the data matrix. By the means of singular value decomposition （SVD） of the matrix and combined with total least square （TLS） to solve the equation, the frequencies are obtained directly and amplitudes are estimated based on least square （LS）. The frequencies and amplitudes of the flicker signal are obtained by the signal transform equations. According to the flicker signal polluted by the interharmonic, the interharmonic frequencies can be estimated by the double-side property. The simulation indicates that it is easy and fast to estimate the parameters by detecting the flicker signal directly. TLS-ESPRIT is insensitive to noise and has improved the estimation precision.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2009年第9期44-48,共5页
Power System Protection and Control
