Analysis of the performance of two digital methods for measuring MOA resistance current

In this paper, our main work includes the introduction of two digital methods for measuring MOA resistance current (harmonic analysis method and digital compensating method), elementary requirement for hardware realization, linear simulation in laboratory and field test. The experimental result shows that these two digital methods can measure resistance current efficiently under the situation of pure resistance with high harmonic disturbance, when the respective results of both methods are coincident. As for the prevailing concerned problem of voltage signal with harmonic content, by carrying out liner simulation and field test, we gained some constructive conclusions: with the increasing of harmonic content, harmonic analysis method compared with digital compensation method can more efficiently indicate the resistance current of MOA.