基于换流器平均值模型的储能变流器快速仿真研究

Fast Simulation Research on Energy Storage Converter Based on Converter Average-Value Model

基于平均值运算理论提出适用于大规模储能系统快速仿真的换流器简化模型。在分析换流器详细模型和控制算法的基础上,根据耦合换流器交流侧和直流侧之间的电气特性,通过受控源表征换流器的输出特性来简化换流器拓扑;为降低仿真运算量,忽略高频分量和中间过程,保留控制算法对换流器特性的影响,并推导了储能变流器的平均值模型,对其进行离散化,得到模型的迭代形式。PSCAD/EMTDC试验验证了所提储能变流器平均值模型在保证仿真精度的前提下,有效提高了大规模储能系统仿真速度。

This paper proposed a converter simplified model which is suitable for fast simulation of large-scale energy storage systems based on the theorem of mean.Detailed converter model analysis and control algorithm are the basis of the simplified model.According to the electrical characteristic between the AC side and the DC side of the coupled convert,the study simplified the model.Moreover,this model elaborated the output characteristic through the controlled source,and it could simplify the topological structure of the converter.This paper removed the high-frequency components and intermediate processes,and the influence of the control algorithm on inverter characteristics is reserved in it to reduce the simulation calculation amount.It deduced an averaged-value model of the energy storage converter and obtained the iterative form of the model from the discretization of the averaged-value model.The results of the PSCAD/EMTDC experiment show that the proposed converter averaged-value model could improve the electromagnetic transient simulation speed of the large-scale energy storage system under the guarantee of simulation accuracy.