光伏并网发电系统孤岛检测技术

Islanding detection technology for a photovoltaic grid-connected power system

孤岛检测是光伏系统并网必需的功能,要求既能快速检测出孤岛状态,同时又能尽量减少对电网的不良影响。介绍孤岛状态产生原理及其带来的负面效应。阐述并网逆变器侧本地检测技术中各种方法的工作原理,并就每种方法的检测盲区、适用范围、对系统电能质量及暂态响应的影响等进行论述。指出在减少对系统影响的基础上,进一步提高检测效率、减小或消除检测盲区以及将基于不同原理的孤岛检测方法组合使用,将是今后孤岛检测研究的重要方向。

Anti-islanding protection is mandatory feature for grid-connected inverters. Desired islanding detection methods not only can detect islanding within acceptable duration, but also require lessening adverse impact on power quality. The occurrence causes and negative effects of the islanding were presented. The non-detection zone, applied scope, influence on power quality and transient response of every method were discussed. Finally, it is indicated that further enhancing of the detection efficiency, diminishing and even eliminating the non- detection zone on the basis of reducing the influence on the system and the combined use of several islanding detection methods based on different principles will become the focuses of future researches.