Hi Ray, Many thanks for your response. According to my KKT conditions, non-generator buses have only energy + loss component as their LMPs. However, for the generator buses, they will be equal to the sum of binding generation limits + energy + loss components. But in my opinion, the only PV bus defined in the system is the slack bus. Hence with no voltage bindings at any other bus, the OPF solution should also not bind any voltages for PQ buses, and hence not depicting their respective influence in the shadow prices. Or is there some misunderstanding here ?
Best, Sarmad From: [email protected] [mailto:[email protected]] On Behalf Of Ray Zimmerman Sent: Thursday, 20 April, 2017 9:35 PM To: MATPOWER discussion forum Subject: Re: LMP Calculations MATPOWER Hi Sarmad, I spent a few minutes looking at this, but not enough to come to a definitive conclusion. However, it seems to me that the sensitivities computed from the power flow assume fixed voltage magnitude at the PV buses, while the OPF solution has no such assumption. Furthermore, the OPF solution does include binding real and reactive power limits on generators, which also affect the LMPs. Ray On Apr 18, 2017, at 9:36 AM, Sarmad Hanif <[email protected]<mailto:[email protected]>> wrote: Dear MATPOWER users, I have a question regarding MATPOWER's ACOPF calculations. I tried decomposing the nodal mismatch values from ACOPF of MATPOWER as the sum of energy + loss components (for the uncongested case). The procedure adopted was: 1) to perform ACOPF and obtain nodal mismatch. 2) use generation setpoints from ACOPF to run AC power flow and calculate loss sensitivities using get_losses function I am a bit confused, as per my understanding, without the congestion and nonbinding voltages, the only separation from the reference marginal cost is due to loss contribution of each node. So at the exact operating point of the grid (power flow with fixed generation from OPF), aren't the loss sensitivities the true representatives of loss contributions ? I have attached the example to show the approach and difference in MATPOWER's ACOPF with my manual decomposition. It will be great if I can have some help regarding it. Best, Sarmad <MWE.M><case33_Example.m>
