An Integrated Method for Generating VSCs’ Periodical Steady-state Conditions and HSS-based Impedance Model

Abstract

This paper proposes an integrated method for generating the voltage-source-converters’ (VSCs’) periodical steady-state (PSS) conditions and the harmonic-state-space (HSS)-based impedance model. Since these two objectives can be realized in one unified frequency-domain iteration process, it is briefly referred to as the automatic model generation (AMG). Application of the AMG method to the impedance acquisition and stability analysis of a single-phase grid-VSC system with corresponding experimental verification is presented as an example. The presented results demonstrate how the AMG method facilitates parametric stability assessments (e.g., under varying control parameters) in an efficient and accurate manner. The AMG method is also applicable to other systems with PSS, aiming for effective and efficient frequency domain analysis with impedances