基于Shepard相似插值的电网非线性评价指标研究

为了准确获取全网运行备用容量以及线路、主变压器的负载情况，为调度运行管理提供可靠数据基础，提出一种基于非线性指数函数的电网评价指标体系，分别给出了全省备用容量监视指标、各分区备用容量监视指标以及线路、主变压器重载和越限指标计算方法，并利用Shepard相似插值算法对各分散指标数据进行融合，给出了电网运行的综合评价指标。相比于传统的线性评价方法，非线性评价体系更符合电网时变性和强非线性的本质特征。最后，利用江苏电网实际运行算例验证了所提出的评价指标体系的正确性和有效性，综合评价指标能客观反映电网总体运行情况，为调度运行管理提供了可靠评价依据。

Research on Power System Non-linear Evaluation Indices Based on Shepard Similarity Interpolation

It is very important for dispatching operation to obtain the accurate reserve capacity and the power load of transmission lines and transformers of the whole power grid. An evaluation system based on nonlinear function is proposed in this paper. Also, the reserve capacity, district reserve capacity, line and transformer capacity calculation methods are provided. Compared to the traditional linear evaluation methods, the proposed method caters for the time-varying and nonlinear characteristics of power system. Besides, the Shepard similarity interpolation algorithm is deployed to provide the total evaluation indices of the whole power system operation condition. The correctness and effectiveness of the proposed evaluation system are verified by a case study which is based on the practical operation condition in Jiangsu power grid.