基于SNOP的不停电转供技术研究

Research on uninterruptible power transfer technology based on SNOP

传统配电网网络架构在不停电转供方面采用的技术方案存在不足,对供电可靠性带来一定影响。针对此问题,提出一种基于柔性软开关(SNOP)的不停电转供技术方案,利用背靠背电压源型换流器组成的SNOP将两回馈线柔性互联,实现馈线传输功率的可控性。SNOP装置在馈线发生故障时,通过控制方式的转换可以有效保障故障馈线上所带负荷的正常运行,以实现对馈线间的负载不停电转供。利用PSCAD/EMTDC仿真软件搭建基于SNOP的两端交直流互联系统对所提技术方案进行验证。结果证明,通过引入SNOP装置能够实现不停电转供需求,所提技术方案能够有效提高供电可靠性。

The technical solutions adopted by the traditional distribution network architecture have certain deficiencies in terms of non-stop power supply transfer,which has a certain impact on power supply reliability.Therefore,an uninterruptible power transfer technology solution based on SNOP(soft normally-open point)is proposed in this paper,in which the SNOP composed of a back-to-back voltage source converter(B2B-VSC)is used to flexibly interconnect two feeder lines to achieve controllability of the transmission power of the feeder lines.When a feeder line is broken down,the SNOP device can effectively ensure the normal operation of the load on the faulty feeder line by the conversion of the control mode,so as to realize the uninterrupted power supply transfer of the load between the feeders.The SNOP-based AC/DC interconnect system was built with PSCAD/EMTDC simulation software to verify the proposed technical solution.The result proves that the introduction of SNOP device can realize the demand of uninterruptible power supply,and the proposed technical solution can effectively improve the reliability of power supply.