Phasor-Domain Power Analysis

Abstract

Power flow for circuits undergoing harmonic excitation is very similar to the DC power analysis that was covered in Chap. 4. However, there are some key differences. First, since the voltages and currents vary with respect to time, the power flow will also vary over time. Therefore, the time-average power flow is of greatest interest when assessing efficiency . Second, rather than having just one power term, the flow of energy associated with the reactive components (i.e., the inductors and capacitors) must also be quantified. Therefore, multiple power terms are needed to define the flow of energy in the circuit. Lastly, when maximizing power transfer, the imaginary portion of the impedance must also be considered. Discussing these different aspects of power flow is the focus of this chapter.