Research About Comprehensive Detection Technology Of Harmonic And Reactive Current

Comprehensive detection technology of harmonic and reactive current has been studied in this paper. The existing detection algorithms of harmonic and reactive current are analyzed and compared.Especially the ip-iq methods based on the instantaneous reactive power theory. The software phase-locked loop has been introduced. The phase-locked algorithm is analyzed in detail. For this algorithm,a comprehensive detection device based on two ARM system is designed and made to test and verify the feasibility of this algorithm.In this paper, the ip-iq methods based on the instantaneous reactive power theory are analyzed in detail. And the performance of the ip-iq methods under the conditions of voltage distortion and three-phase unbalanced under the is discussed. It proposes to use software phase-locked loop to realize the high precision phase tracking. And two kinds of software phase-locked loop algorithm that based on synchronous reference frame are analyzed.On the basis of theoretical analysis, based on Matlab/Simulink tool box, simulation of ip-iq methods based on the instantaneous reactive power theory are used to analyze the quality of he ip-iq methods based on the instantaneous reactive power theory, single synchronous reference frame software phase-locked loop (SSRF SPLL) and decoupled double synchronous reference frame software phase-locked loop (DDSRF SPLL).Design and produce of the hardware experiment platform for detection system. Including the design of the acquisition circuit of three-phase voltage and current signals. Design software development platform based on ARM. The acquired three-phase voltage signals are used for software phase-locked loop. The phase information combined with the collected current signals to calculate of harmonic and reactive currents. Design the program of the algorithm of ip-iq,spll and the dual port RAM communication program.With the system designed above, the harmonic and reactive currents comprehensive detection device is tested at least.