中文摘要：

为减小线性插值的误差,结合线性插值及电力系统波形特点,提出一种改进线性插值算法,并对其插值方式进行了详细分析。利用PSCAD电力系统仿真软件得到A相接地短路故障的实验数据,导入MATLAB对智能变电站中采样值丢包进行了仿真分析。结果表明：改进线性插值算法在非连续丢包及稳态情况下的连续丢包估计准确度都很高;暂态下发生连续采样值丢包时,估计准确度也较线性插值有了明显的提高,适于实际应用。

英文摘要：

An improved linear interpolation algorithm is proposed, which combines the linear interpolation and the waveform characteristics of the power system to reduced the error of the linear interpolation and analysis is made on the interpolation methods. By using PSCAD fault simulation, experimental data of A phase ground short circuit fault are given. The simulation analysis is made on sampling value packet loss by importing MATLAB in the smart substation. The results show that the estimation accuracy of improved linear interpolation algorithm is very high in the discontinuous packet loss and continuous packet loss under the steady state. And the estimation accuracy is also improved obviously when continuous sampling value packet loss under transient state occurs, which is suitable for practical application.