TY - JOUR N2 - This paper presents a method of calculation of steady-state processes in threephases matrix-reactance frequency converters (MRFC's), in which voltages and currents are transformed by control signals with two pulsations. A solution of nonstationary differentia equations with periodic coefficients that describe this system is obtained by using Galerkin's method and an extension of equations of one variable of time to equations of two variables of time. The results of calculations are presented in an example of three-phases MRFC with buck-boost topology and compared with a numerical metod embedded in the program Mathematica. L1 - http://www.journals.pan.pl/Content/84681/PDF/06_paper.pdf L2 - http://www.journals.pan.pl/Content/84681 PY - 2012 IS - No 3 September EP - 371 DO - 10.2478/v10171-012-0029-8 KW - matrix-reactance frequency converter KW - non-stationary periodic differential KW - Galerkin's method KW - extension of differential equations A1 - Korotyeyev, Igor Ye. A1 - Zięba, Beata PB - Polish Academy of Sciences VL - vol. 61 DA - 2012 T1 - Analysis of three-phases matrix reactance frequency converter with two pulsations of control signal SP - 359 UR - http://www.journals.pan.pl/dlibra/publication/edition/84681 T2 - Archives of Electrical Engineering ER -