The measurements are inputs. They are not derived from any other data related to the case. My guess is that the creator of test_se_14bus.m took values from a solved power flow case and added some noise to them to “create” measurement data to use as inputs to the state estimation problem.
-- Ray Zimmerman Senior Research Associate B30 Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Feb 25, 2014, at 11:53 PM, Vishnu Priya K P(MT2012164) <[email protected]> wrote: > Yes Sir, Thanks for the help. > > To be more clear, I am not able to understand where are those measurements in > measure variables coming from? I checked with the generator data for PG and > QG and bus data for Vm and Va and branch data for the rest. The data in those > generator, bus and branch from the case file of the ieee14 bus system does > not match with the idx and measure variables in state estimation file. > > Is the data in test_se_14bus.m file not obtained from the case14.m? If not > can you let me know where it is obtained or is it just a sample data that is > used for state estimation to compute z_est and compare with original > measurements. > > Thanks, > Vishnu Priya > Master's student, > IIIT-Bangalore. > From: [email protected] > <[email protected]> on behalf of Ray Zimmerman > <[email protected]> > Sent: Wednesday, February 19, 2014 1:05 AM > To: MATPOWER discussion forum > Subject: Re: Doubts in test_se file in state-estimation > > I’m not sure I understand your question? While I didn’t write this code, my > understanding is that the idx and measure variables are what you use to > specify the quantities that you have measurements for. The state estimation > problem finds the state of the system (set of bus voltages) that result in > the closest match to the measured quantities. > > -- > Ray Zimmerman > Senior Research Associate > B30 Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > On Feb 17, 2014, at 2:02 AM, Vishnu Priya K P(MT2012164) > <[email protected]> wrote: > >> Dear Sir, >> >> I am working on state estimation in Matpower. I have to analyze the state >> estimation for 39 bus system for different algorithms. In the test_se file >> in this path \matpower4.1\extras\se, where does the eight idx measurements >> come from? Are these measurements taken after the powerflow or directly >> from the bus and generator details before the powerflow? Can you please >> guide me on which file is used to obtain those details. >> >> Thanks, >> Vishnu Priya >> International Institute of Information Technology >> India
