摘要
孤岛问题是威胁分布式发电系统并网安全运行的一个关键问题,因而系统必需具备及时检测出孤岛的功能。通过分析常用的自动相位偏移孤岛检测方法,针对DSP应用环境下检测时间较长,对系统电能质量影响较大等问题,提出一种基于改进自动移相法的快速孤岛检测方法。该方法根据孤岛发生后电流相位角与公共点频率之间的关系,调节扰动相位的正反馈,从而快速检测出孤岛,在一定负载条件下不存在检测盲区。仿真结果表明了改进算法的有效性与快速性,具有一定的工程应用价值。
The problem of islanding is an important issue that may threat the network security of distributed generation system, so the system need to have the function of detecting islanding in time. By analyzing the conventional automatic phase shift islanding detection method, for the problem of long detection time,and it has greater impact on system power quality in DSP application environment, a fast islanding detection method based on the improved automatic phase shifting was proposed. The working principle of the improved method is analyzed, according to the relationship between current phase angle and the common point frequency when islanding adjusted the positive feedback of perturbations phase to achieve the purpose of rapid detection of islanding.And this method under certain load conditions do not exist detection blind spots. Simulation results show that the proposed algorithm is efficient and fast, and it has certain application value in engineering.
出处
《电子技术应用》
北大核心
2015年第11期108-111,共4页
Application of Electronic Technique
关键词
分布式发电
并网逆变器
孤岛检测
主动移相
distributed generation
grid-connected inverter
islanding detection
active phase shift
