A CONTRIBUTION FOR MODELING CONTROLLED AND UNCONTROLLED AC DC CONVERTERS IN HARMONIC POWER FLOWS/

The main object of this paper is to present a sequential method of adj usting the operating point of converters within the framework of harmo nic power flows. To do that, a unified formulation of previous work in the frequency domain have been developed, resulting in a Set of compa ct and powerful analytical expressions for ac and de magnitudes. Speci al attention has been paid to uncontrolled rectifiers. The proposed se quential method offers a more flexible and modular framework where ac and/or de magnitudes can be used for defining the operating point. Mor eover, it provides better convergence properties for Iterative Harmoni c Analysis (IHA). Newton's method or Gauss's method can be applied for IHA without special considerations. Finally, the solution obtained ha s been verified by means of time domain simulation and measurements.