Precise model analysis for 3-phase high power converter using the Harmonic State Space modeling

This paper presents about the generalized multi-frequency modeling and analysis methodology, which can be used in control loop design and stability analysis. In terms of the switching frequency of high power converter, there can be harmonics interruption if the voltage source converter has a low switching frequency ratio or multi-sampling frequency. The range of the control bandwidth can include the switching component. Thus, the systems become unstable. This paper applies the Harmonic State Space (HSS) Modeling method in order to find out the transfer function for each harmonics terms. The modeling procedure shows the precision in the analysis of the stability as well as the controller design. The overall results are validated by using not only the non-linear time domain simulation, but also the analytical model.