The formation of a three-phase voltage system using digital-to-analog converters

摘要

It is being suggested a method of static power quality factors' standard values formation, such as voltage unbalance factors on negative and zero sequences of three-phase voltages, and voltage deviation of the positive sequence. The formation of the above mentioned factors is being fulfilled in two stages. At first, with use of the digital-to-analog method it is being formed three three-phase voltages of the fundamental frequency having the same amplitudes and initial phase angles. Then the necessary unbalance of the three-phase voltages is being formed by the appropriate shift of their angles, and voltages duration of fundamental frequency's positive sequence - by the same changing of conversion coefficients of each phase voltages' digital-to-analog converter (DAC). Such a method shows fewer errors and requires less linearity of phase voltages channels' gains when compared to known methods.