I'm looking for a way to solve the following circuit
Without the voltage sources on the circuit, I would be using a simple Y-Δ transform. But I'm not sure how I should proceed with them on.
Which methods should I use ?
There is a quite simple way to solve this (without Y-Δ-transform). Here is an outline:
Recognize that nodes A and B are connected by 3 parallel Thevenin sources (= voltage source with resistor in series).
Convert each of the Thevenin sources into a Norton source.
Those 3 Norton sources can be combined very easily into one Norton source.
If you want, you can transform that combined Norton source back into a Thevenin source.