Abstract:Non-Intrusive Load Monitoring (NILM) technology enables power users to understand the power consumption of various types of equipment at different times by disaggregating the total energy load data to help decision makers develop sound energy efficiency plans,reduce energy costs,which plays an important role in emission reduction.The advantages of NILM are analyzed in comparison with the traditional intrusion load monitoring,and the characteristics of low cost,simple deployment and easy expansion.Secondly,the basic framework of NILM is summarized,and the NILM algorithm is introduced in detail from the two aspects of supervision and unsupervised algorithm.Then the existing data set and algorithm evaluation index are discussed.Finally,the challenges facing the current NILM are pointed out.