A Non-iterative Harmonic Power Flow Method for Accurate Harmonic Calculations

This paper presents a new harmonic power flow method for the AC/DC converters. The method is based on a unique model for the AC/DC converters. The model transforms the time domain nonlinear characteristics of the converter into a frequency domain linear admittance matrix. The matrix represents the coupling among the converter AC side harmonic voltages and currents accurately. An interesting feature of this model is that its elements do not vary with the harmonic voltage conditions of the system. As a result, a non-iterative harmonic power flow algorithm is developed with the model. Case studies show that the model can be further simplified without significant loss of accuracy, which leads to an even simpler harmonic power flow algorithm.