非稳态谐波和间谐波检测的新方法

提出了一种非稳态谐波、间谐波检测的新方法。该方法基于零差算法与增强型锁相环(enhanced phase-locked loop,EPLL)算法。零差算法具有计算量少、性能稳定的特点,利用参考信号对输入信号进行调制,从而得到非稳态谐波分量。根据输入信号预处理得到的间谐波分量频率范围设置EPLL算法的角频率初始值,以提高对间谐波分量的检测效率。采用多单元并行结构实现了对非稳态谐波、间谐波分量的同时检测。仿真结果表明,该方法能扩大EPLL算法中信号参数调节因子的取值范围,快速、准确检测出非稳态谐波、间谐波分量,有效抑制噪声干扰以及各频率分量之间的相互干扰。

A New Method to Detect Non-stationary Harmonics and Inter-harmonics

A new method to detect non-stationary harmonic components and inter-harmonic components is proposed.Considering the stable performance and low calculation burden of homodyne algorithm,the proposed method is based on homodyne algorithm and enhanced phase-locked loop(EPLL) algorithm,and the input signals are modulated by reference signals to obtain non-stationary harmonic components.According to the frequency range of inter-harmonics obtained from preprocessing of input signals,the original angular frequency value of EPLL algorithm is set to improve the efficiency of detecting inter-harmonic components.Parallel structure of multi-units is utilized to implement synchronous detection of non-stationary harmonics and inter-harmonics.Simulation results show that the proposed method can enlarge the value range of the adjustment factor of signal parameters in EPLL algorithm,thus non-stationary harmonic components and inter-harmonic components can be detected fast and accurately,and the noise interferences and mutual interferences among different frequency components can be effectively eliminated.