First, for future reference, please use a subject line related to your question rather than simply replying to an unrelated thread.
You can simply convert your loads from fixed to dispatchable using load2disp()<https://matpower.org/docs/ref/matpower7.1/lib/load2disp.html> and run an OPF. For example with case9, with changes all of the load is served with no problems … mpc = load2disp(loadcase('case9')); runopf(mpc) ================================================================================ | Bus Data | ================================================================================ Bus Voltage Generation Load Lambda($/MVA-hr) # Mag(pu) Ang(deg) P (MW) Q (MVAr) P (MW) Q (MVAr) P Q ----- ------- -------- -------- -------- -------- -------- ------- ------- 1 1.100 0.000* 89.80 12.86 - - 24.756 - 2 1.097 4.892 134.32 0.09 - - 24.035 - 3 1.087 3.247 94.19 -22.58 - - 24.076 - 4 1.094 -2.464 - - - - 24.756 0.005 5 1.084 -3.983 - - 90.00* 30.00* 24.999 0.027 6 1.100 0.601 - - - - 24.076 - 7 1.089 -1.198 - - 100.00* 35.00* 24.254 0.036 8 1.100 0.904 - - - - 24.035 - 9 1.072 -4.617 - - 125.00* 50.00* 24.999 0.112 -------- -------- -------- -------- Total: 318.31 -9.62 315.00 115.00 … but with the line ratings on lines feeding bus 7 reduced, it is forced to curtail the bus 7 load … define_constants; mpc.branch(5:6, RATE_A) = 40; runopf(mpc) ================================================================================ | Bus Data | ================================================================================ Bus Voltage Generation Load Lambda($/MVA-hr) # Mag(pu) Ang(deg) P (MW) Q (MVAr) P (MW) Q (MVAr) P Q ----- ------- -------- -------- -------- -------- -------- ------- ------- 1 1.100 0.000* 83.52 13.79 - - 23.375 - 2 1.094 4.353 110.02 -7.40 - - 19.903 - 3 1.083 4.440 100.28 -28.15 - - 25.570 - 4 1.094 -2.292 - - - - 23.375 0.008 5 1.083 -3.523 - - 90.00* 30.00* 24.624 0.014 6 1.099 1.609 - - - - 25.570 - 7 1.094 -0.200 - - 75.51* 26.43* 4456.8491551.860 8 1.100 1.077 - - - - 19.903 - 9 1.071 -4.445 - - 125.00* 50.00* 22.624 0.091 -------- -------- -------- -------- Total: 293.83 -21.76 290.51 106.43 Hope this helps, Ray On Nov 23, 2020, at 3:33 PM, [email protected]<mailto:[email protected]> wrote: From: [email protected]<mailto:[email protected]> Subject: Re: Bus, Loads and Generators question Date: November 23, 2020 at 3:33:40 PM CST Hi Ray How do you compute optimal amount of load shedding in MATPOWER
