为了精确检测含有风机的电力系统低频振荡参数,提出了一种稳定图和矩阵束相结合的新算法。首先用稳定图法确定区间低频振荡信号的阶数,在得到了系统阶数之后,就可以应用矩阵束算法得到每个分量的幅值和特征根,进而可以获得系统的阻尼比、幅值和频率。最后的仿真实验结果表明,与TLS-ESPRIT算法相比,该方法计算的阻尼比最大相对误差更小。在不同的系统中,运用该方法依然可以得到较准确的结果。
In order to accurately detect the low -frequency oscillation parameters of power system with wind turbines, a new algorithm is proposed which combines the stabilization diagram and the matrix pencil. Firstly, the order of the interval low - frequency oscillation signal is determined by the stabilization diagram method. After getting the system order, the amplitude and the characteristic root of each component can be obtained by using the matrix pencil algorithm, and the damping ratio, amplitude and frequency of the system can be obtained too. Finally, the simulation results show that compared with the TLS - ESPRIT algorithm, the damping calculated by the proposed method is less than the maximum relative error. In different systems, the proposed method can be used to get more accurate results.