基于全负荷开关组网多种运行模式的电力网络系统

  目的]  针对现有技术中全负荷开关馈线故障处理的缺陷，提出一种基于全负荷开关组网多种运行模式的电力网络系统。分析了现有配电网故障处理技术的特点，详细阐述了系统的组成，包括:进线、智能终端单元、负荷、联络线和主干线路。  方法]  通过两个相邻智能终端单元之间的就近通信，取消了系统的保信子站，逻辑判据只需要知道自己和相邻开关之间的状态；定值统一设置，整定简单，全线故障处理无级差配合；只要线路物理结构不发生变化，自适应于各种网络的连接结构和系统的运行方式，无需重设。  结果]  试验检测结果表明:每个配电智能终端可以控制一个负荷开关，也可以控制多个负荷开关，增加“负荷预判功能”，可根据现场情况选配。  结论]  该系统在多种运行模式下处理故障的快速性与可靠性，可在实际配电网中推广应用。

A Power Network System Based on Multiple Operating Modes of Full Load Switch Networking

  Introduction]  The paper aims at the defects of full-load switch feeder fault handling and proposes a power network system based on multiple operating modes of full-load switch networking. The characteristics of the existing distribution network fault handling technology are analyzed, and the different components of the system are elaborated, including incoming line, intelligent terminal unit, load, tie line and trunk line.  Method]  By using near communication between two adjacent intelligent terminal units, the system′s guarantee substation can be cancelled, and the logic criterion only needs to know its state and that of the adjacent switch. The constant parameter was set in a uniform and simply way, and the whole line fault processing is in a stepless coordination. The constant parameter setting is adaptive to the connection structure of various networks and the operation mode of the system, and it doesn′t need to be reset unless the physical structure of the line is changed.  Result]  The test results show that each power distribution intelligent terminal with load prediction function can control one load switch or multiple load switches, which can be selected according to the site conditions.  Conclusion]  The proposed system can handle faults rapidly and reliably in a variety of operating modes, and hence can be applied in practical distribution networks.