为了提升可再生能源的消纳率、适应新型负载的接入以及激活竞争开放的售电市场，能源互联网应运而生。作为能源互联网的关键支撑设备之一，电能路由器以其电能变换的高可控性、传输的多样性和灵活性，受到了研究人员的密切关注。随着电能路由器功率等级的提升以及功能的拓展，其拓扑结构和控制策略设计越来越复杂，若基于其详细拓扑进行仿真，则会导致装置的电磁暂态仿真效率十分低下。在此背景下，本文围绕电能路由器的高效仿真建模方法及其仿真应用展开研究。首先，本文调研了目前电能路由器的研究现状，总结了电能路由器的电路设计特点，然后对电能路由器的高效建模方法进行了文献调研和分类，并分析了各类高效建模方法的原理、特点及适用场景，同时指出了目前面向电能路由器高效建模研究的不足。对电能路由器的高效仿真模型及应用进行了调研和分类，指出了研究电能路由器高效仿真模型的重要性。然后，本文基于离散网络法推导得到电能路由器各种元器件的暂态等值模型。结合电能路由器电路所具有的“多级联”特征，提出了通过简化电容暂态等值模型实现电能路由器级间解耦的简化建模方法，从而将单一的大型电路网络解耦成多个子网，有效降低了网络节点方程的维数。基于一台380V/50kVA电能路由器进行仿真测试，验证了该简化建模方法的准确性与数值稳定性。其次，本文总结了电能路由器的子模块电路及多个模块之间的组合方式。结合电能路由器的“模块化”特征，通过对单个模块及多模块组合进行戴维南等效，有效降低了各个子网的网络节点数量，进一步降低了网络节点方程的维数。基于一台具有80多个电路子模块的电能路由器进行仿真测试，验证了所提简化建模方法的准确性及数值稳定性。最后，介绍了一台10kV/1MVA四端口电能路由器的电路拓扑及控制策略，然后根据所提的高效建模方法，推导得到该电能路由器的高效仿真模型，并基于MATLAB/SIMULINK搭建了其高效仿真平台。经仿真测试，该高效仿真平台的提速比达到100倍，证明了本文所提高效建模方法的快速性。最后，利用该高效仿真平台对该电能路由器的控制参数进行优化，从而体现该高效仿真平台的应用优势。
In order to increase the consumption rate of renewable energy and provide electrical interface for new kinds of DC loads and activate a competitive and open electrical power market, energy internet is proposed. Being one of the key fundamental devices of energy internet, energy router has received a great deal of attention from researchers because its high controllability of electrical energy conversion, diversity and flexibility of power transmission. As the power level of energy router increases and the application scenarios extend, the topology and control strategy design become more and more complicated. If the simulation model is built based on the complete circuit model, the simulation efficiency will become very low. Under this background, this paper focuses on high-efficiency simulation modeling method of energy router and its simulation application.Firstly, the current researches of energy router are investigated and design features of energy router are summarized. High-efficiency simulation modeling methods of energy router are investigated and classified, and principles, features and applicable scenarios of different methods are analyzed. In the meantime the drawbacks of present research toward high-efficiency simulation modeling methods are discussed. Besides， the high-efficiency simulation models of energy router and its application are investigated, and the importance of studying high-efficiency simulation models of energy router is pointed out.Then, based on the discrete network method, transient equivalent model of different circuit components of energy router are derived in this paper. Considering the multilevel connection characteristics of energy router’s circuit, this paper proposes a simplified modeling method which can decouple different stage of energy router by simplifying the transient equivalent model of capacitance. By using this simplified method, the single large circuit network can be divided into several relatively small subnetworks, thus the dimension of the node equations of the network will significantly decrease. Simulation test is conducted on a 380V/50kVA energy router, and the results verify the accuracy and numerical stability of this simplified method.Next, the submodule circuits of energy router and combination modes of different modules are summarized. Considering the modularity feature of energy router’s circuit, this paper applies Thevenin equivalent method to submodule circuits of energy router and combinations of different modules, thus significantly reduces the number of different subnetworks’ nodes, which further reduces the dimension of node equations of the network. Simulation test is conducted on an energy router which has more than 80 circuit submodules, and the results verify the accuracy and numerical stability of this simplified method.Finally, the circuit topology and control strategies of a 10kV/1MVA four-port energy router are introduced. By using the proposed high-efficiency modeling method, high-efficiency simulation model of this energy router is derived, and high-efficiency simulation platform is built based on MATLAB/SIMULINK. Simulation test shows that this high-efficiency simulation platform has achieved 100 times speedup ratio, which proves the rapidity of the proposed high-efficiency modeling method. At last, based on this high-efficiency simulation platform, control parameters of energy router is optimized, which shows the application advantages of this high-efficiency simulation platform.
