【摘要】 电力系统继电保护的最小二乘算法由于采用的噪声模型不同而有多种形式。文中首先列举了最小二乘算法的各种模型及其组合,通过研究算法模型对滤波性能的影响,提出采用IH(平均最大频谱)和IL分别评估算法滤除谐波分量的能力和滤除非周期分量的能力。使用该方法对各种噪声模型进行了对比研究,并得到了各种时间窗长度下的对于电压和电流信号的最佳模型。仿真计算表明所提出的比较方法及其结果是正确的。最后,基于得到的最小二乘算法的最佳模型,提出了一种基于最小二乘算法的快速距离保护。更多还原

【Abstract】 The least error square (LES) algorithm used in power system relay protection has many forms because of the noise models used. This paper enumerates all kinds of noise models of LES and their combination. Through the research on the influence of noise model on the filter performance of algorithm, this paper proposes the IH (average of max spectrum) and IL to evaluate the performance of algorithm to filter out non-period component and harmonic frequency components respectively. All kinds of noise models are compared with the method, and the optimal models of algorithm of every time window on voltage and current are obtained. Simulation results prove that the method and the noise models obtained are correct. Finally, based on the optima! noise models obtained above of least error square algorithm, this paper proposes a fast distance protection.更多还原