IEC16850 standard-based islanding detection algorithm for distributed generator integrated power systems

A feasibility study of integration of DGs in power system network which is related with several protection and security challenges. The islanding detection is one of major problems, when the power grids' service is disconnected while the DGs are still in use. As a result of this phenomena, stability and power quality may worsen as the DGs may not be able to maintain voltage and frequency. The security of the utility employees may also be at risk during the islanding stage. Due to the harmful effects of unplanned islanding brought on by high DG penetration, therefore the solution is to have a connection to operate the micro grid system both grid connected and islanded modes of operation. In order to test the protection functioning of the micro grid system, a lab-scale protection test bench is set up at the CPUT CSAEMS laboratory utilizing a generator protection relay and test injection device.本研究针对电力系统中集成分布式发电机（Distributed Generators, DGs）的可行性展开分析，该场景涉及多类保护与安全挑战。孤岛检测便是其中一项核心难题：当电网中断供电但分布式发电机仍处于运行状态时，便会触发孤岛效应。此类现象会导致系统稳定性与电能质量下降，因为分布式发电机无法维持电压与频率稳定。孤岛运行阶段还会威胁电网运维人员的作业安全。鉴于高渗透率分布式发电机引发的非计划性孤岛效应存在诸多危害，因此可行的解决方案是使微电网系统能够在并网与孤岛两种运行模式下切换运行。为验证微电网系统的保护功能，研究团队在开普半岛理工大学（CPUT）CSAEMS实验室搭建了实验室规模的保护测试台，采用发电机保护继电器与测试注入装置完成相关测试。