Study of Phase Compensation on Power Measurement

摘要

Phase deviation is an important error source to power measurement device.Based on some analysis upon the equivalent circuits for voltage sampling ,current sampling and filter , the error models of phase deviation under different frequency are established in this paper;the calculate methods of active power and reactive power by synchronous AC sampling are introduced and a new method of phase compensation on power measurement is brought forward;a segment linearization correction method for the calibration points phase deviation is presented by choosing the turning points of the curve of current and phase deviation;steps of power compensation are given and the precision of power measurement is improved.The measurement precision both active power and reactive power of the online detector of three-phase AC sampling based on the algorithm proposed in this paper are less than 0.05%.