i have checked in many documentations but i always find the same thing which transforms from abc to dq in a matrix form but if i want to do it in transmission lines where the generators, feeders, load were connected together how am i supposed to calculate my initial conditions in matlab simulation?
Hello,
You can apply the ABC to DQ transformation for calculating the initial conditions (load flow solutions). When you do it for a single machine infinite bus (simplest) system, you can use the generator rotor angle as your transformation angle. However, when you are applying for an interconnected network, you have to realize that you can not use the individual rotor angles of all machines as the transformation angles but use a common transformation angle for all the voltages and currents in the network. It need not be any specific angle, but the use of the same angle ensures that all the voltages and currents are transformed using a common reference phasor. If you wish to learn about the details of the calculation of network initial conditions for dynamical studies, you can refer to "Power Systems Dynamics and Control" by Prof. K. R. Padiyar.
Kaustav Dey tqsomuch for responding to my question. Could you please explain me in a simple way...
Thank you
I guess the simplest explanation here is: Get load flow solution in phasor format. You get all three phase voltage and currents as solutions. You can do D-Q transformation of all these quantities, but use a constant argument of the D-Q transformation function for network consistencies to be preserved. P,lease follow the reference in my earlier answer for the calculation of the initial conditions of the generator state variables.
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