A new approach to model AC/DC/AC conversion systems

A new approach for modeling AC/DC/AC power conversion systems is presented and discussed. It is based on the modulation function theory and utilizes the concept of the iterative harmonic analysis (IHA), taking advantage of a two-step procedure in which two different models are utilized. The proposed approach can be applied successfully on HVDC systems and adjustable speed drives for synchronous and asynchronous motors, achieving better modeling accuracy with respect to classical modulation function approaches and reduction of computational burdens with respect to the time domain models. It constitutes an attractive tool inside Monte Carlo simulations for the probabilistic analysis of harmonic and interharmonic distortion. Comparative tests validate the proposed method and demonstrate its accuracy performances.