Dynamic Analysis of Harmonic Interaction Between AC AND DC Power Systems

This paper describes a method of computing harmonics and waveforms in HVdc conversion, taking into account interaction with the ac system, dynamically. The perfbrmance of filters tuned at a nominal frequency is examined when the ac system frequency varies. Computed values of harmonic currents and voltages are presented and the influence of the ac system short circuit ratio is demonstrated. Harmonic magnification can occur due to resonance effects, but the system is harmonically stable.