一种高精度的电网谐波/间谐波检测的组合优化算法

摘要

In order to improve power quality and accurately measure the frequency values, amplitudes and phases of harmonic and inter-harmonic signal in power grid, a high precision combinational optimization algorithm for measuring electric grid harmonics and inter-harmonics is presented. Firstly, double window all-phase FFT time-shift phase difference spectrum correction method is used to detect the frequency values of harmonic and inter-harmonic signal. Then the objective function of the parameters of amplitude and phase angle is built. The initial value and iterative precision are set. Iterative calculation is performed to target function by quasi-Newton optimization algorithm. Finally the corresponding amplitudes and phase angles are estimated. Using the method to detect the complex inter-harmonic signal, the simulation experimental results show that the algorithm based on the combinational optimization algorithm of double window all-phase FFT time-shift phase difference spectrum correction and quasi-Newton optimization algorithm has realized the higher precision detection of inter-harmonic signal frequency, amplitude and phase three characteristics. And the algorithm has a higher ability to resist noise.%为了提高电能质量，准确测量电网中的谐波和间谐波频率、幅度和相位，给出一种高精度的电网谐波和间谐波检测的组合优化算法。首先，利用双窗全相位快速傅里叶变换时移相位差频谱校正法，检测出谐波和间谐波的频率值；再构建谐波和间谐波信号幅值和相角参数的目标函数，设定初始值和迭代精度，由拟牛顿优化算法对目标函数进行迭代运算，检测出相应的谐波和间谐波信号的幅值和相位角。利用该方法对复杂间谐波信号进行检测，仿真实验结果表明，基于双窗全相位快速傅里叶变换时移相位差频谱校正法和拟牛顿法的组合算法实现了间谐波幅值、频率和相位三个特征的较高精度检测。且该算法具有较高的抗噪声干扰能力。