基于变压器参数修正的变电站状态估计

常规变电站状态估计中电压或无功的误差普遍比较大，其中一个原因是模型的参数不准确．通过变压器参数引入状态量或同时引入状态量及量测量的方法，来建立变电站状态估计的模型，并对这2种模型及权值变化对状态估计精度的影响进行分析，得到如下结论：如仅将参数作为状态量而不加约束，可以使实际量测量的估计精度大幅提高，但导致参数估计值误差过大；只有将参数同时作为状态量和量测量，并对权值进行适当调整，才能兼顾实际量测量和参数的估计精度，得到更有实用价值的状态估计结果．

Parameter Modifiability Based Transformer Substation State Estimation

The accuracy of transformer substation state estimation is widely low,and one reason of that is inaccurate(parameter) of model.Recently,most of papers about state estimation(SE) focus on improving algorithm.Based on classic SE and parameter estimation(PE),this paper takes advantage of the methods that putting parameters into state vector and putting parameters both into state vector and measurement vector in discussing the influence of parameter on transformer substation SE via simulation.The result of simulation shows: First,the error of parameters will be too high if only putting them into state vector,although the result of SE will be much better.Second,putting parameters both into state vector and measurement vector and giving them appropriate coefficient will lead a better result that can be used by engineering.