摘要
提出了新的闪变参数估计方法,该方法在Hilbert变换提取闪变包络线的基础上,用Pisarenko谐波分解估计各调制分量的频率和幅值。在估计过程中,用FFT分析得到Pisarenko谐波分解所需的调制分量个数,解决了闪变调制分量个数不确定的问题。在设定噪声条件下,用所提方法分别对单一频率和多频率调制的闪变进行仿真,并将所得估计值与FFT频谱分析方法所得结果进行了比较,验证了所提方法可以更准确得到低频调制信号幅值和频率的优点。
In this paper,a new parameter estimation method for voltage flicker is proposed in which Pisarenko Harmonic Decomposition（PHD） analysis is used to estimate the flicker parameter included in flicker envelope detected by Hilbert transform.The total number of modulation components required in the PHD estimation process is obtained by FFT analysis.Simulations using the proposed method are made based on the single-frequency and multi-frequency modulated flicker respectively as well as using the FFT spectral analysis method under the setting SNR.Through comparison of the estimates resulting from the two parameter estimation methods,it can be concluded that the proposed method is capable of accurate estimation of frequency and magnitude of the modulation components in voltage flicker.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第6期26-29,34,共5页
Power System Protection and Control
基金
'十一五'国家科技支撑计划项目(2007BAA12B03)
