基于柔性直流配电系统的10 kV交直流备自投技术

10 kV AC/DC Automatic Switching Technology Based on Flexible DC Distribution System

柔性直流配电系统的接入使变电站10 kV侧电源结构发生变化,传统10 kV分段备自投装置不再适用。对此,通过分析柔性直流配电系统对变电站10 kV备自投逻辑的影响,设计了10 kV柔性直流备自投装置功能、通信架构及动作判据,并在此基础上提出3种10 kV交直流备自投控制策略,形成动作策略流程图。最后,基于珠海三端柔性直流配电网示范工程,通过PSCAD/EMTDC仿真验证了所提策略的有效性,并归纳总结各项策略的技术特点及适用范围。与传统10 kV分段备自投技术相比,所提方案可有效提高变电站供区重要负荷的供电可靠性。

Access of the flexible DC power distribution system changes the power structure of 10 kV side of substation, which makes the traditional 10 kV automatic switching device is no longer applicable. By analyzing the impact of flexible DC distribution system on the action logic of 10 kV automatic switching device, this paper designs the function, communication architecture and action criterion of 10 kV flexible DC automatic switching device. It proposes three control strategies for the 10 kV AC/DC automatic switching technology based on the 10 kV flexible DC automatic switching device, and draws action strategy flow chart. Finally, the effectiveness of the proposed strategy is verified by the PSCAD/EMTDC simulation of the Zhuhai three-terminal flexible DC distribution network demonstration project. The technical characteristics and application scope of each strategy are summarized. Compared with the traditional 10 kV automatic switching technology, the 10 kV AC/DC automatic switching technology based on flexible DC distribution system can effectively improve the power supply reliability of important loads in the substation supply area.