Electronic circuit survey for office load monitoring and identification

Plug-in office electronic equipment are generally accepted as more challenging in the field of nonintrusive appliance load monitoring (NILM) due to the similar characteristics of these loads. This paper presents the results of a survey of front-end DC power supply circuit topologies and electrical operation principles for the most popular plug-in office electronic equipment. The front-end topologies study forms the base to analyze the validity of the steady state features used in the previous research. This analysis helps to identify redundant features and drive to an optimized feature selection from the power electronics´ point of view. The electrical operation principles study shows the necessity and feasibility of additional features that can be used to compensate the limitation of applying only steady state features for the load identification.