利用改进Prony算法的励磁调节器中PSS的设计

Design of PSS for excitation regulator with improved Prony algorithm

提出了基于Prony分析的电力系统等值线性模型的辨识方法。对传统的Prony方法进一步扩充,首先通过小波变换对信号去噪来提高辨识的准确性,然后建立多信号样本函数矩阵来辨识振荡特征,并考虑了输入信号对输出信号的影响,得到了系统的传递函数,采用留数方法对模拟励磁调节器进行了参数的协调配置。在此基础上设计了一种含PSS的励磁调节控制器,并在Matlab下对单机无穷大系统进行仿真分析,验证其控制的可行性及有效性。将所设计的模拟励磁调节器加入实际系统进行仿真,结果说明利用改进算法设计出的PSS效果优于利用传统线性化数学模型设计的PSS。

The identification of equivalent linear model for power system is proposed based on Prony analysis.Signals are denoised by wavelet transform to improve the accuracy of identification and a multi-signal sample function matrix is then built to identify the oscillation characteristics.The system transfer function is obtained while the influence of input signal on output signal is the considered.Residue method is applied to coordinate the parameters of analog excitation regulator,based on which,an excitation regulator with PSS（Power System Stabilizer） is designed.Simulation with Matlab is carried out for one-machine infinity power system to verify its feasibility and effectiveness.Simulations for actual system with the designed analog excitation regulator show that,the performance of PSS designed with improved Prony algorithm is better than that by traditional linear mathematical model.