Iterative harmonic analysis for controlled and uncontrolled AC/DC converters under unbalanced conditions: a compromise between model accuracy and flexibility

In a previous paper, the authors presented a method for treating very efficiently controlled and uncontrolled power converters under balanced conditions. A sequential method of adjusting the operating point of such converters was proposed. It improves the convergence as well as the flexibility of the model in order to be included in the harmonic power flow. These results have been extended here to unbalanced power systems. Compact expressions of harmonic currents and their sensitivities are also developed. The model accuracy is conditioned by the DC busbar representation: a finite reactance and a DC voltage. It provides good results in many high powered applications and makes possible to reach the aforementioned flexibility of the model