Poynting Vector and the Quality of Electric Energy

摘要

This paper expounds on electric energy quality issues using the Poynting Vector (PV). It is shown that compo- nents that do not contribute to a net energy transfer, are attributed to the nonactive components of the PV that are associated with three situations: 1. Phase displacement, 2. Current harmonics injection, 3. Load unbal- ance. The nonactive PV components can be viewed as carriers of polluting energy that negatively affects the energy transfer process and its conversion at the end-user. The developed analysis helps visualize the flow of electric energy in poly-phase systems and provides a theoretical based for the resolution of apparent power for three-phase systems with nonlinear and unbalanced loads.