LTP Modeling and Analysis of Frequency Coupling in PLL-Synchronized Converters for Harmonic Power Flow Studies

As known, nonlinear loads in power systems originate harmonic distortion and quality issues. Converter-interfaced exhibit a behaviour as well may largely contribute to increase the pollution. The nonlinearities introduced by PLL-synchronization control originate, indeed, coupling mechanism between fundamental frequencies. These effects are not captured traditional Norton/Thevenin equivalent converter models, leading inaccurate flow analyses. This paper proposes Linear Time Periodic model of PLL-synchronized be used Harmonic Power Flow A realistic 18-bus distribution grid hosting substantial amount power-electronic interfaced resources is case study. It revealed that, high loadability condition with distorted supply voltage, harmonics significantly amplified converters components buses voltages reduced, representing risk for voltage stability. phenomenon also influenced tuning current loop PLL. accuracy presented analyses validated comparing results time-domain simulations.