For the last year or so I have been intermittently reading about HVDC modelling. My goal with this is to implement some sort of AC/DC steady state modelling in GridCal.
Unlike the AC equations, which are quite clear by now, the HVDC modelling is scattered and unclear in the literature (at least for me) despite being investigated since the 1960’s.
So far I have made the following conclusions:
The simplest model is to replace an HVDC line with a positive power generator on the sending side and a negative power generator on the receiving side. I’d rather implement something better than this…
There are plenty of articles modifying the Jacobians of Newton-Raphson for specific converters and what not. I would rather not do that, since I am not interested on automatically tuning the parameters.
Then, there is the MatACDC approach: decouple the AD and DC parts and simulate iteratively.
On the other side there are is legendary work by Jos Arrillaga and Bruce Smith that leads me to believe that a unified way is totally viable. This is also the way that Enrique Acha (from the same school) maintains in his latest book with a proposition for an AC/DC unified formulation.
So, I’d love to have a healthy discussion on the pros and cons of all the above.