基于间谐波泄漏的谐波间谐波检测新方法

New method of harmonic and inter-harmonic detection based on inter-harmonic leakage

在同步采样条件下,间谐波对谐波以及间谐波之间的频谱泄漏是产生检测误差的主要原因。为此,文中提出一种谐波间谐波检测新方法来消除间谐波对谐波的频谱干扰,该方法根据间谐波旁瓣泄漏特点,对谐波邻近的间谐波泄漏谱线进行指数拟合求取间谐波在谐波频点处的泄漏值,进而得到较精确拟谐波信号,然后进行时域采样分离拟谐波信号得到拟间谐波信号。通过对频率相近的间谐波采用补零法进行频段划分,各频段进行加窗插值后得到较精确间谐波参数。最后,算例仿真误差结果验证了该方法的有效性。

In synchronous sampling conditions,the spectrum leakage of the inter-harmonic and inter-harmonic between is the main reason for the detection error.In this paper,a new calculation method was proposed to eliminate the interference between harmonic and inter-harmonic.It obtains accurate quasi harmonic signal,by meaning of exponential fitting to estimate the leakage value of the inter-harmonic at the adjacent to the line of the harmonic spectrum.The quasi inter-harmonic signal is obtained by separating the quasi harmonic signal through the time-domain sampling method.The inter-harmonics of frequency relatively nearby divide the frequency bands by the null method,and for each frequency band,the method of adding window interpoltion is used to obtain the more accurate harmonic parameters.The simulation error results have verified the effectiveness of the proposed method.