基于Prony算法的电力系统低频振荡分析

简要介绍了电力系统低频振荡的概念和产生原因,指出随着电网互联,低频振荡的危害也将更加严重。而后根据振荡特征提出了一种可用于分析电力系统低频振荡的方法———Prony算法,并介绍了算法的原理和计算步骤。通过对理想振荡波形进行分析,论证Prony算法在理想情况下的精确性。接着指出传统Prony算法在分析中所存在的缺陷,特别是噪声干扰对算法精确度的影响。在此基础上提出了一个较为简便的解决方法,利用仿真振荡波形分析说明改进后的Prony分析的精确度,针对其误差变化情况,讨论了分段Prony分析法,最后说明Pro-ny算法在电力系统低频振荡分析中的有效性。

Analysis of Power System Low Frequency Oscillation Based on Prony Algorithm

This paper introduces the conception and cause of power system low frequency oscillation briefly.Then points out that during the development of power system,the harm of low frequency will be more and more severe. In order to defend power grid and use the power resource fully,this low frequency oscillation must be taken attention seriously.Above all,the characteristic of the oscillation should be analyzed.Based on the characteristic of oscillation,the paper advances a method used in analyzing power system low frequency oscillation-Prony algorithm,and then introduces the theory and step of this algorithm.the veracity of Prony algorithm is demonstrated by using it to analyze oscillation wave in ideal condition.And then the limitation of conventional Prony algorithm in process of analysis is pointed out,the influence of noise on accuracy of Prony algorithm is discussed especially.After these a comparatively simple way to solve the difficulty is given, its accuracy is proved by analyzing oscillation wave in emulation condition.Contrasting to the result of Prony analysis,the ameliorative Prony algorithm is discussed by dividing the oscillation wave.The improvement and use of Prony algorithm to low frequency oscillation is the core of this paper.After all,the validity of improved Prony algorithm to analysis of power system low frequency oscillation is explained,and then the useful foreground of it in this field is expected.