基于云边协同的配网潮流方向识别与保护方法

Method of Distribution Network Tidal Current Direction Recognition and Protection Based on Cloud-Edge Collaboration

随着分布式电源(DG)的大量接入,传统单电源配电网络转变为多电源供电网络,导致传统三段式电流保护系统出现误动和拒动问题。为解决这些问题并保障DG接入后的稳定运行,分析了DG对潮流方向的影响,提出了基于故障电流相位分析的方向识别判据。根据潮流方向识别结果,提出一种基于云边协同的电流保护方案。该方案在保护装置中整合了方向识别功能,只有在电流超出整定值且方向正确时,保护装置才会动作。结果表明,该方案不仅能满足线路保护范围要求,还能准确识别故障方向,提高了DG接入后保护装置的准确性。

With the large-scale integration of distributed generation(DG),the traditional single-source distribution network has transformed into a multi-source power supply network,leading to misoperation and refusal issues in the traditional threestage current protection system.To solve these problems and ensure stable operation after DG integration,this paper analyzes the impact of DG on tidal current direction,and proposes a direction recognition criterion based on fault current phase analysis.According tidal current direction,a current protection scheme based on cloud-edge collaboration is proposed.This scheme integrates direction recognition function in the protection device,which will only act when the current exceeds the setting value and the direction is correct.The results show that this scheme can not only meet the requirements of line protection range,but also accurately identify fault direction,improving the accuracy of protection devices after DG integration.