I am simulating the IEEE 6-bus system in Simulink with two DGs, but after adding breakers and CTs, the synchronous machine ports (E_pu, R, C)

I am trying to simulate the IEEE 6-bus system in Simulink with two integrated DGs. I used simplified machines to model a diesel generator and a microturbine. When I run the load flow without connecting the ports (E_pu, R, C), the load flow converges. But after adding circuit breakers and a built-in CT found on the MathWorks website, I now get errors. When I remove the synchronous machines everything works, but with them included, I have problems.

I think I need to correctly configure these ports, but I am struggling to do it.

you can find the pdf of my model . I would appreciate help understanding how to correctly configure these ports. Thanks

Answer 1

[Sabin]

Synchronous machines require proper initialization and electrical connections for the load flow to converge. For synchronous machine blocks specify the bus type and beginning values using the Initial Conditions settings. The available parameter targets depend on whether the block is configured for a swing, PV, or PQ bus. In the Initial Conditions settings:

- Set the Initialization option parameter to Set targets for load flow variables.

- Select a bus for the Source type parameter.

- Specify values for the related bus parameter.

- To avoid a simulation issue due to a nonoptimal minimum, in the Expected ranges settings, specify minimum and maximum values for the Internal source phase search range parameter.

For more information about how to perform a load flow analysis using Simscape electrical check this page:

https://www.mathworks.com/help/sps/ug/perform-a-load-flow-analysis-using-simscape-electrical.html

[Prosper Diyani]

Thank you for your answer. It aligns with what I was able to understand while reviewing the MATLAB Help Center pages and the “Learn” section in Simulink.