Critical evaluation of FBD, PQ and generalized non-active power theories

Due to the widespread use of non-sinusoidal, non-periodic loads and the existence of distorted voltages, many definitions of non-active power for non-sinusoidal and non-periodic waveforms have been formulated. This paper investigates the major similarities and discrepancies of three non-active power theories which are widely used in control algorithms for shunt compensation systems. The three approaches are FBD, PQ and generalized non-active power theories. The evaluation and comparison of these three theories as the non-active power compensation strategies for single-phase system, three-phase system with unbalanced load, sub-harmonic load, and distorted system voltage will be included in this paper. The conclusions are based on both the simulation and the experimental results of different compensation objectives.