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分布式发电系统并网运行时,若主网故障解列断电,就会处于孤岛状态,这是一种会威胁到工作人员及设备安全的状态,现在的孤岛运行及其检测研究多集中在基于逆变器的分布式系统,对基于同步电机的分布式系统则研究不足。以同步电机为基础,对中小型水电的孤岛运行进行了阐述,针对原有的不足,提出了一种新的孤岛检测辅助方法,在MATLAB/Simulink软件环境下的仿真表明新的方法在较严苛的功率缺额条件下检测效果明显,能够达到规定的检测阈值,从而迅速检测到孤岛的存在,实现简单可靠,而建议的控制方式能够极大地消除重合闸过程中的振荡,减小对系统的冲击和损害,有利于系统的稳定运行。
When distributed power generation system is operating in grid connection, it will be in an isolated state if the main grid fails to be powered off. This is a state that threatens the safety of staff and equipment. Now the research on island operation and its detection is mostly concentrated in Based on the inverter distributed system, based on the synchronous motor-based distributed system is not enough. Based on the synchronous motor, the islanding operation of small and medium-sized hydropower is described. Aiming at the existing problems, a new islanding detection aided method is proposed. The simulation under MATLAB / Simulink software environment shows that the new method is more strict Under the condition of harsh power shortage, the detection effect is obvious, and the specified detection threshold can be achieved, thereby quickly detecting the existence of island and realizing simple and reliable control. The proposed control method can greatly eliminate the oscillation in the reclosure process and reduce the influence on the system Impact and damage, is conducive to the stable operation of the system.