Research Review of Non-invasive Load Monitoring

Non-invasive load monitoring technique is to decompose the total load profile into the separate load profiles of each connected electrical equipment and to identify the operation status of each connected equipment.Then, the power consumption or supply of each equipment can be adjusted accordingly which enables the power system load-side demand response capability to alter the electricity consumption on time. Meanwhile, with the wide application of smart meters and machine learning algorithms, more attention has been paid to non-invasive load monitoring techniques in recent literature. Therefore, this paper presents a comprehensive review of non-invasive load monitoring techniques. Firstly, the basic framework of sub-intrusive load monitoring is presented and explained. Secondly, the equipment is classified in its operating state and the load characteristics of the connected equipment are listed and analyzed. Finally, existing research methods are summarized and discussed along with the monitoring difficulties in existing methods and the future research direction in non-invasive load monitoring techniques.