介绍了基于等效电流量测变换的状态估计算法,并在此基础上提出了一种改进算法.应用抗差估计的理论构造了一组权函数,在每次迭代的过程中对权重不断修改,从而达到提高估计精度的目的.Matlab仿真实验结果表明,估计精度得到了提高.

False Data Injection Attacks (FDIA) in Smart Grid is considered to be the most threatening cyber-physics attack. According to the variety of measurement categories in power system, a new method for false data detection and identification is presented. The main emphasis of our research is that we have equivalent measurement transformation instead of traditional weighted least squares state estimation in the process of SE and identify false data by the residual researching method. In this paper, one FDIA attack case in IEEE 14 bus system is designed by exploiting the MATLAB to test the effectiveness of the algorithm. Using this method the false data can be effectively dealt with.

This paper focuses on integrated comparative analysis of three kinds of classical states estimation algorithms from theory based on least squares method, including weighted least squares method, fast decoupled method, and the equivalent current measurement transformation method. The simulation experiment of IEEE14, 30 and 118 node system by MATLAB is carried out, then the efficiency analysis of three kinds of algorithms is done from the results of estimate, the number of iterations, the objective function and running time. Some conclusions are obtained. First, the weighted least squares method has the best estimation quality, good convergence rate, but the large amount of calculation, so it is not suitable for large-scale power system. Second, fast decoupled method has similar estimation quality. The weighted least squares method computes fast when the node system is small; the fast decoupled method has fast calculation speed when the node system is big. The process of fast decoupled method is relatively complex and applicable to high voltage system analysis. Third, the calculation speed of the equivalent current measurement transformation method is the fastest, but the estimation quality is the worst, and it is only suitable for the measurement system in which the measurement of the active power and reactive power is paired. Analysis and comparison of the results are helpful for selecting appropriate state estimation algorithm.