The reactive compensation control system needs such parameters which detect quickly and accurately the fundamental reactive power and power factor of the system so to control the fundamental reactive power of for the output system of reactive power compensation equipment. In view of such problems in the existing detection method as reduction of calculation result and slow calculation speed due to the harmonics of network and the reactive power compensation equipment itself and on the basis of the principle of phase-locked amplifier

a kind of fast and accurate fundamental wave reactive power and power factor detection method is proposed. Simulation analysis is carried out on Matlab

the maximum errors of each parameter at different SNR in case of containing multiple kinds of harmonics are compared. The experimental platform is set up and the accuracy of the method is verified by Fluke-435-II power quality analyzer. It is shown by the simulation and experiment that this method can

in case of containing harmonics

detect accurately and quickly the fundamental reactive power and power factor of the system and has provided theoretical basis and practical method for reactive power detection of the reactive power compensation system.