An Integrated Method for Generating VSCs’ Periodical Steady-State Conditions and HSS-Based Impedance Model

An integrated method for generating the system's periodical steady-state (PSS) conditions and the harmonic-state-space (HSS)-based impedance model is presented, referred to as the automatic-model-generation (AMG) method. This method is efficient for parametric impedance-based stability analysis, since it can precisely take the varying PSS into account and the presented algorithm can be readily implemented by the frequency-domain iteration. Application of this AMG method to the impedance acquisition and stability analysis of a single-phase grid-tied voltage-source-converter (VSC) along with experimental verifications is presented as an example. The presented results demonstrate how the AMG method can facilitate parametric stability assessments (e.g., under varying control parameters) in an efficient and accurate manner.