Do you have the CIGRE HVDC Benchmark model?
The attached example project contains the LCC-HVDC benchmark model. The project includes two study cases, one to study the load flow conditions (LoadFlow Conditions) and a second prepared to perform EMT simulations (HVDC Control), the model is designed for EMT simulation.
The model the orientation setting of all converters is set to R (Rectifier), the orientation setting changes the internal connection of the thyristors in the bank. In the example all converters are set to R to simplify the implementation. The converters direction was consider then with the graphical connections (on the inverter side the thyristor symbols will then point downwards).