Method and system for monitoring user-side harmonic pollution

The invention relates to the field of electric energy quality monitoring, aiming to solve the problem that user-side harmonic pollution can not be correctly obtained in the prior art. The invention provides a method and a system for monitoring the user-side harmonic pollution. The method comprises the following steps of: collecting current data of a user-side electrifying apparatus by utilizing a current collecting device; collecting public connection point voltage data by utilizing a voltage collecting device; transmitting the current data and the public connection point voltage data to a system terminal; calculating the current data of emission harmonic of the user-side electrifying apparatus and an impedance value of the harmonic of the electrifying apparatus at the system terminal by utilizing a partial least-squares regression algorithm to acquire active power of the emission harmonic of the user-side electrifying apparatus; and sending alarming information when the active power of the emission harmonic