随着我国城镇化的发展和对用电可靠性的提高，以及分布式能源大量接入、电动汽车的推广，智能配电网的建设越来越受到关注。为了确保配电网稳定、高效、可靠、智能的运行，从而促进配电网的智能化建设，智能站所终端（DTU）的研制尤为重要。智能站所终端一般安装在常规的开闭所、户外小型开闭所、环网柜、小型变电站、箱式变电站等处，通过数据采集、处理对开关进行分合闸操作，实现对开关的故障定位、故障隔离和非故障区域的恢复供电。 首先，在了解DTU基本设计需求的基础上，完成了对智能站所终端硬件结构和软件结构的设计；对自愈控制进行了深入研究，设计了分布自愈控制方法包括配电区域划分、故障定位机理、故障隔离机制以及健全区域自动恢复机制，以两个级联开闭所为模型，举例验证了分布自愈控制在开环配电网和闭环配电网中的实现；为了保证信息的安全性，设计了SM2算法的加密、解密步骤以及验签流程。 其次，对该智能站所终端进行了详细软件设计：对不同保护功能进行了逻辑设计；着重对分布自愈控制实现的各个阶段进行了详细设计，包括数据采集、电流突变量启动、故障功率方向判定、故障定位、故障隔离以及健全区域自动恢复供电；对SM2加密算法的加密、解密、验签功能进行了逻辑设计。 最后，通过软硬件联调，验证了保护功能的可靠性；搭建由三个级联开闭所构成的开、闭环配电网实验模型，模拟在不同位置发生瞬时性故障和永久性故障时开关的动作情况以及动作时间，并加以记录，验证了分布自愈控制能够准确隔离故障区域并且恢复对非故障区域的供电，测试过程中并没有出现越级跳闸情况，因此验证了该智能站所终端防越级跳闸的能力；通过对101、104通信规约安全功能符合性测试和异常报文的测试验证了SM2椭圆双曲线加密算法在通信过程中的安全性和可靠性。

With the China's urbanization development and the improvement of the electrical reliability, as well as the access to a large number of distributed energy、promotion of electric vehicles,the construction of Smart Distribution network attracts more and more attentions.In order to ensure Distribution network going on a stable, efficient, reliable and intelligent operation,thus promote the construction of intelligent distribution network,the research of Intelligent Distribution Terminal Unit (DTU) is particularly important.DTU is usually installed in a conventional opening and closing,Outdoor small opening and closing,RMU,Small Substations,Box-type substation and so on,though the data acquisition and processing,it brings about the sub-closing operation of switch,so completes the fault location, fault isolation and the restoration of electricity of the non-fault region. Firstly, based on the understanding of the basic design requirements of DTU, we complete the hardware and software architecture design of the intelligent Distribution Terminal Unit ;By the way of the depth study of Self-healing control, we design the method of the distribution self-healing control which includes Distribution zoning、the mechanism of fault location、the mechanism of fault isolation and the mechanism of automatic recovery of non-fault region,In the model of two cascade opening and closing,it verifies the implementation of distribution self-healing control used in open loop and closed-loop distribution network;In order to guarantee the security of information,we design the encryption、decryption step and the sign inspection process of SM2 algorithm. Secondly, we carry out a detailed software design of the Intelligent Distribution Terminal Unit:design the Different protection logic,carry out the detailed design of the various stages of the distribution self-healing control including Data acquisition、the start-up of the current mutation、the fault power direction judgment、the fault location, fault isolation and the restoration of electricity of the non-fault region;design the encryption、decryption step and the sign inspection logic of SM2 algorithm. Finally, we verify the reliability of protection by the joint debugging of software and hardware;Building the open-loop and closed-loop distribution network experimental model formed by the three cascaded opening and closing,we simulate the switching operation as well as operation time of the transient fault and permanent faults occurred in the different positions and record them,which prove that distribution self-healing control can accurately isolate faults and restore the electricity to the non-fault region,during the test,there do not appear Grade trip,Therefore,this verifies that the Intelligent Distribution Terminal Unit can avoid the grade trip effectively;By testing the safety function and abnormal packets of 101、104 communication protocol,we confirm the security and reliability of the SM2 elliptical hyperbolic encryption in the communication process.