Initialization of power grid with fundamental synchronous machine model and power converters. Using powerlib in Simulink.

I am working on a simulated power electrical system in Simulink using the specialized electrical library. The study is about rotor angle stability, so I am using the fundamental synchronous machine model. I want to add a power converter model to simulate a photovoltaic plant. How can I initialize the initial variables of the model so that it starts in a stable state?

Answer 1

[Joel Van Sickel]

One of the easier (but more time consuming) ways is to start the system powered off, and simulate turning on so that you can see all the steady state values. A more advanced way would be to use load flow, but that is hard because you can't do it with the power electronics included in the model. The third approach is to have enough insight into your system to know what the initial voltages and currents should be based on back of the hand estimations. Realistically, its not that easy to immediately start in the perfect state, which is why I recommend the 1st approach. Once you use the 1st part, you can also try using simulaiton states to restart form that point in time: Unfortunately, I don't know how well that works with specialized power systems. https://www.mathworks.com/help/simulink/ug/decide-how-to-save-block-states-and-simulation-operating-points.html