METHOD FOR DIGITAL MEASUREMENT OF SYMMETRICAL COMPONENTS OF VOLTAGES OF THREE-PHASE NETWORK

摘要

A method for digital measurement of symmetrical components of voltage of three-phase electric network based on analog-to-digital conversion of three input A, B, C voltages into, respectively, A-, B-, C- sequences of codes of instantaneous values, with obtaining codes of voltage of inverted sequence of fundamental harmonics. Besides that, the number of measurements of codes of instantaneous values of voltages one adjusts to frequency fM of network voltage, and in each phase it is equal to 3k (k=1,2,3,4,…), A-, B-, C-sequences of the codes of instantaneous values of voltages one remembers in sequence to, respectively, A-, B-, C-sequences of memory cells, one adds, respectively, to the codes of the B-sequence of the memory cells in sequence, beginning from the (2k+1)-th memory cell, and the codes of the C-sequence of the memory sells in sequence, beginning from the (k+1)-th memory cell, from the sequence of sums of codes obtained one separates the codes of voltage of the inverted sequence of the fundamental and higher harmonics.