多端直流配电网实时仿真的模型分割方法

Model segmentation method for the real-time simulation of a multi-terminal DC distribution network

多端直流配电网不仅节点数量多,并且包含较多的电力电子装置,受单个仿真机处理能力的限制,多端直流配电网实时仿真实现难度大。为了实现多端直流配电网实时仿真,采用理想变压器模型法对多端直流配电网进行模型分割,以直流电网为边界,将各端换流站及其交流系统作为一个子系统,子系统之间通过理想变压器模型交互数据。最后,以5端直流配电网为例,将系统分割为5个子系统,对比分析分割模型和原模型在各种工况下的动态响应,二者动态过程基本一致。结果分析验证了所提模型分割方法的可行性和有效性。

The multi-terminal DC distribution network not only has a large number of nodes,but also contains more power electronic devices.Limited by the processing capacity of a single simulator,it is difficult to realize the real-time simulation of the multi-terminal DC distribution network.In order to realize real-time simulation of multi-terminal DC distribution network,the ideal transformer model method is utilized to model the multi-terminal DC distribution network.The DC grid is considered as the boundary,and the converter stations and their AC systems are treated as a subsystem.The subsystems exchange data through ideal transformer model.Finally,a 5-terminal DC distribution network is taken as an example and the system is divided into five subsystems.The dynamic responses in different cases of segmented method are compared with the original integral model then.The dynamic responses of the two kinds of models are nearly the same.The feasibility and effectiveness of the proposed model segmentation method is verified.