中文摘要：

基于柔性直流技术的智能配电网与交流电网的连接方式是系统设计的基础,也是直流配电中的关键技术之一,为此针对±10kV基于柔性直流技术的智能配电网接入交流电网的方式开展了理论和仿真分析。首先从理论上简要分析了其与10kV交流配电网之间可能的连接方式及各种连接方式下交直流系统故障之间的相互影响。然后在电磁暂态仿真软件PSCAD/EMTDC中建立不同连接方式下的仿真模型并开展典型故障下的仿真计算,从过电压和过电流的角度分析交直流系统故障间的相互影响。最后,从系统运行可靠性和经济性的角度提出基于柔性直流技术的智能配电系统与交流电网之间推荐的连接方式,即直流配电系统通过联接变压器与交流电网连接。

英文摘要：

The access mode of the intelligent distribution network based on flexible DC technology to the AC network is the base of the system design, and is also one of the key technologies of DC distribution. Therefore, the theory and simulation analysis of it are conducted. First, the possible connecting modes and the mutual influence of them under faults are theoretically analyzed briefly. Then the typical faults are simulated by establishing the simulation models under different connecting modes with the electromagnetic transient simulation software PSCAD/EMTDC, and the influence between the DC and AC systems under the faults are analyzed by comparing the over-voltages and the over-currents. Finally, from the views of the reliability and construction cost of the system, the recommended connecting mode is put forward, that is the DC distribution network accessing to the AC network with a coupled transformer.