Harmonic source-sink nodal diagram for analyzing directional flow of reactive power

The work in this paper researches directional flow of reactive power at harmonic frequencies in a power system. An innovation is the introduction of the concepts sources and sinks to demonstrate directions. A nodal diagram and new formulae are developed for analyzing harmonic source-sink relationships of reactive power directional flows. Harmonic penetration, resonance and anti-resonance conditions are investigated to evaluate nodal source-sink responses including the operation of a harmonic filter. Case studies are conducted using a harmonic analysis software tool. The results are analyzed and compared. This new approach has shown to be effective and can be used for enhancing understanding of directional reactive power flows at harmonic frequencies.