HiI have a question about running the state estimation code implemented in matpower. I want to run the state estimation code on IEEE 118 bus system. To form the measurement data used as the input of the problem, I want to do run a power flow on this system. Then I want to use the results of power flow (voltage magnitude of buses, power flow from lines and power injection of generator buses) and add a measurement error with specific variance (say 5 percent) to them. My question is that How should I do this? for example, if power flow from a line is 0.2 pu (in the base of 100 MVA), It should become: 0.2 + sqrt(0.05)*0.2*randn(1,1) ? or it should be 0.2+sqrt(0.05)*randn(1,1) ?My other question is that what is a common value for state estimation residual ? Is it usually a small value (for example lower than 1)?Thank you very much in advanceSincerely yours
