Steady-State Modelling of VSC MTDC for Power System Analysis in DIgSILENT Power Factory

In this paper, a steady-state multi-terminal voltage source converter high voltage direct current (VSC MTDC) model for power system analysis in DIgSILENT PowerFactory is introduced. Power flow is one of the most important and most widely used calculation in power system analysis. Although DIgSILENT PowerFactory provides a variety of elements for building MTDC grids, it's very inefficient when using the basic elements, such as ElmVscmono and ElmDcdc, to build multi-voltage level MTDC grids for example collection of large-scale renewable energy generation cluster. The aim of this paper is to derive custom steady-state VSC HVDC models to be incorporated into built-in AC/DC power flow computations that can handle power grids with high proportion of renewable energy generation connected. The hybrid modeling methods can effectively improve the modeling efficiency and extensibility. An AC/DC power flow is implemented using DIgSILENT PowerFactory to show the validity of the steady-state models.