分布式发电并网系统中孤岛检测方法的综述研究

Overview study on islanding detecting methods for distributed generation grid-connected system

目前常用的孤岛检测方法可分为远程法、本地被动法、本地主动法三大类,各大类又可分为多种不同方法,其中远程法可分为PLCC法、SPD法和SCADA法等;本地被动法可分为电压/频率检测法、电压谐波检测法和电压相位突变检测法等;本地主动法可分为阻抗测量法、电抗插入法、电压偏移法、功率扰动法、主动频率偏移法和滑模频率漂移等。对孤岛检测方法进行了全面地综述研究,对孤岛检测方法进行了分类,阐述了孤岛状况出现的条件及其影响,分析了各种孤岛检测方法的原理和优缺点,说明了它们的特点和适用场合,指出了孤岛检测方法的发展方向。由于每种方法各有其特点,在实际应用中,应根据实际情况,合理选用一种或多种孤岛检测手段,其中将两种以上不同原理的孤岛检测方法组合使用,可获得更好的检测效果。

The islanding detection methods currently used can be divided into three categories namely remote methods,local passive methods and local active methods,and each category can be divided into several different methods.The remote methods can be divided into PLCC method,SPD method and SCADA method,etc.;the local passive methods can be divided into voltage/frequency detection method,voltage harmonic detection method and phase jump detection method,etc.;the local active methods can be divided into impedance measurement method,reactance insertion method,the voltage shift method,power perturbation method,active frequency shift method and sliding frequency drift method,etc.In this paper,the islanding detection methods for distributed generation system are comprehensively reviewed,the islanding detection methods are classified,the producing conditions and its effects of islanding are presented,their principles and advantages/disadvantages are analyzed,their characteristics and application field are discussed,and the developing trend of islanding detection method is pointed out.As each method has its own characteristics,one or more detection methods should be rationally selected in practice according to actual situation,in which two or more different detection methods can be used in combination to obtain better detection results.