介绍了对未来可再生电能传输与管理系统保护及运行改进,该系统使用固态变压器连接住宅交流和直流微电网到配电系统,并使用故障隔离设备隔离故障线路,提出一种电流差动保护方案来检测基于FREEDM的微电网网络中的故障,该方法使用相量测量单元进行数据同步并最小化测量误差,并采用物联网技术和Wi-Fi通信方案在设备间进行数据监测和互连。然后通过一个仿真FREEDM系统进行测试,在不同位置施加了不同类型和不同故障电阻的故障来证明所提出的保护方法在检测故障状态方面的有效性,利用安全性、可靠性和准确性指标对所提出方法的性能进行了调查。最后设计、实施和测试了FREEDM系统的原型,使用Proteus软件模拟器和实验室进行了测试。测试结果证明,所提出的保护方案以快速、可靠和准确的方式检测和隔离故障状态的效率,该保护方案对于所有故障实现了高达98.825%的准确率。

This article introduces the protection and operational improvement of the Future Renewable Electric Energy Delivery and Management System (FREEDM),which uses solid-state transformers to connect residential AC and DC microgrids to the distribution system,and uses fault isolation equipment to isolate faulty lines.A current differential protection scheme is proposed to detect faults in the FREEDM based microgrid network,this method uses phasor measurement units for data synchronization and minimizes measurement errors,and uses IoT technology and Wi-Fi communication solutions for data monitoring and interconnection between devices.Then,a simulated FREEDM system is used for testing,and different types and fault resistances of faults are applied at different locations to demonstrate the effectiveness of the proposed protection method in detecting fault states.The performance of the proposed method is investigated using safety,reliability,and accuracy indicators.Finally,a prototype of the FREEDM system is designed,implemented,and tested using Proteus software simulator and laboratory.The results demonstrated the efficiency of the proposed protection scheme in detecting and isolating fault states in a fast,reliable,and accurate manner.In addition,the protection scheme achieved an accuracy of up to 98.825% for all faults.