BUDEANU AND FRYZE - 2 FRAMEWORKS FOR INTERPRETING POWER PROPERTIES OFCIRCUITS WITH NONSINUSOIDAL VOLTAGES AND CURRENTS

Contents The development of power theory of circuits with nonsinusoida l voltages and currents was shaped for several decades by two differen t approaches introduced, separately, by Budeanu and Fryze in the ninet een thirties. This paper investigates these two power theories from th e present perspective and up to date comprehension of power phenomena in circuits with distorted voltages and currents. It shows the reasons for which Budeanu's power theory misinterprets power phenomena and wh y it does not provide fundamentals for the power factor improvement. T his paper shows that a number of concepts introduced to power theory b y Fryze are still alive and are very important for developing that the ory, but it also has a number of serious limitations. Because of that, some issues, important theoretically, and a number of practical probl ems in systems with distorted waveforms were not solved within Fryze's power theory. This was the reason for further developing the power th eory of systems with nonsinusoidal voltages and currents. This process is not completed yet and a lot can be learned from the history of thi s theory's development.