I have a very theoretical doubt. I'm trying to fully understand the load flow analysis and its application. So I have a network with about 300 nodes (AC transmission network). Inside every node I have load and generation. Also the nodes are connected each other by different voltage lines (110kV, 220kV and 380kV). So, my task is to create the admittance matrix of the system. Therefore, I have to assume certain conditions. The nodes are regions of a certain country, so inside them they are cities and substation and whatever necessary. Im only considering the lines that come in and out from the nodes. So, my doubts are:
1.- How do I deal with nodes connected by more than one line? specially when these lines have different lengths and max I capacities.
2.- How do I establish generation and load nodes (base on the load flow analysis theory http://en.wikipedia.org/wiki/Power_flow_study) Should I divide the nodes? (Considering that the equations for these kind of nodes vary in relation to the known variables).
3.- The transformers are inside the nodes (as I said my idea is to consider only the lines coming out and in from the nodes) Is this correct? can I neglect the transformers and consider only the lines?
4.- The only way for having the whole network entirely connected is considering all the voltages lines as one. Explanation: a region is connected with other by a 380kV line and then this one connects with other by a 110kV line and so on. Is this correct?
It is hard to understand on the fly the load flow analysis as I have to jump into a complex problem with a short notice.