摘要
迅速有效的孤岛检测技术对于分布式发电系统的安全可靠有着十分重要的意义。针对分布式发电系统的孤岛检测问题,提出了一种简单有效的检测方法:在分布式电源出口端任意两相间设置一个晶闸管,通过控制晶闸管周期性瞬时导通,人为造成分布式电源出口端周期性瞬时相间短路,从而产生周期性短路脉冲电压和电流。基于该短路脉冲电压和电流,实时获得分布式电源出口处的系统阻抗,通过监测该系统阻抗的变化即可迅速判断出分布式电源是否处于孤岛状态。文中也对检测信号间的干扰进行了有效分析。理论推导、仿真和模拟实验都验证了该方法的有效性。
It is very important for a distributed generating system to have an effective islanding detection component.A new and effective islanding detection scheme is proposed.The scheme includes a thyristor placed between any two phases just by the port of a distributed generator（DG）.An artificial short time phase-to-phase short circuit is formed by triggering the thyristor periodically,so the short-circuit current and voltage pulse can be extracted.Because of this,the frequency response of system can be acquired according to the theory of harmonic impedance,so that the impedance measured from DG port can be obtained. Whether the DG is islanding can be determined quickly by monitoring the changes of this impedance.At the same time, disturbances between different DG＇s detecting signals are analyzed.This method is proved to be correct and effective by theoretical analysis,simulation and mockup experiment.
出处
《电力系统自动化》
EI
CSCD
北大核心
2013年第2期119-124,共6页
Automation of Electric Power Systems
基金
山东省自然科学基金资助项目(Z2008F10)~~
关键词
分布式电源
孤岛检测
晶闸管
谐波阻抗
distributed generator（DG）
islanding detection
thyristor
harmonic impedance
