Answer Question
VSC model
Hi, I want to create a VSC model (I'm a beginner), in the literature I found some schematics for which I have a question. Two photos of the models are attached. On one model, the reference voltage is positive and measured with negative, on the other it is the other way around. What it depends on? Later there are other signs on adders in front of the controller. For photo no. 1 I found the equation from which it results, but not for photo no. 2. I will be grateful for any help. Regards 
