A new modelling framework for power supply networks with converter based loads and generators - the Harmonic State-Space

This paper presents a new modelling framework, the Harmonic State-Space (HSS). The new framework is intended for stability analysis of electromagnetic or control interactions between interconnected power electronic systems. Existing modelling methods are summarised, highlighting their advantages and disadvantages. The HSS provides a framework to accommodate non-linear power electronic circuits that are linearised around a base case operating point in the state-space structure. This approach allows the HSS models to make use of pole-zero plots and bode plots for stability analysis. HSS models of an HVdc converter and a 6-pulse STATCOM are shown as examples.