theoreticall mechanism of make_PTDF

Hello there,  I am working on power network partition, and a source code on github does the partition using make_PTDF. I have searched for papers talking about Power Transfer Distribution Factor but they dont have any concrete or difinite conception about PTDF. According to the sourcecode in m

Re: theoreticall mechanism of make_PTDF

Hi Young, In MATPOWER, the matrix returned by makePTDF() is simply the sensitivity of branch real power flows to incremental bus real power injections assuming: (1) a lossless DC model of the network (see Section 3.7 in the MATPOWER User’s Manual