Dear Prof. Ray, Thank you very much for your reply. But I still do not understand why the LMP at the node of load curtailed does not reach 100€/MWh. I tried increasing the load (both active and reactive with constant power factor) and my results were each time the same. The LMPs are the same (82€/MWh) and the objective function is the same. May you please explain why the value never reaches 100 €/MWh?
Thank you. From: [email protected] [mailto:[email protected]] On Behalf Of Ray Zimmerman Sent: lunes, 23 de mayo de 2016 15:50 To: MATPOWER discussion forum Subject: Re: LMP Calculation during Voltage Congestion I think what you are seeing is the effect of the constant power factor constraint on the curtailable load. This constraint essentially bundles the real and reactive power together into a single bundled commodity that is being curtailed at 100€/MWh. Some of that due to the nodal price of real power and some to the nodal price of reactive power, which is likely to be high in a voltage congestion case. See section 4.1 in the MATPOWER Tech Note 2 on AC Power Flows, Generalized OPF Costs and their Derivatives using Complex Matrix Notation<http://www.pserc.cornell.edu/matpower/TN2-OPF-Derivatives.pdf> for more details on this effect. Ray On May 20, 2016, at 9:30 AM, Ibtihal Abdelmotteleb <[email protected]<mailto:[email protected]>> wrote: Dear Prof. Ray, I have a question regarding LMP calculation during congestion. I ran OPF on the 34-node feeder distribution network, feeding from a single infinite generator of price 50€/ MWh. It did not converge due to voltage congestion, not thermal congestion (there is no line congestion). Then, I introduced load curtailment with a price of 100€/MWh. The OPF converged, and at the bus of load curtailment the price was 82€/MWh, although I was expecting it to be at least 100€/MWh. Do you think I have done something wrong? or is there an explanation why thermal congestion is different from voltage congestion? Thank you very much. Ibtihal Abdelmotteleb PhD Student IIT, Comillias University Madrid, Spain
