Hi Aqeeb, The ‘mu’ you mention is the same as the load scaling factor ‘lambda’ in MATPOWER’s continuation power flow. Lambda = 0 denotes a base-case generation/loading scenario, while lambda=1 is the target generation/loading scenario.
For plotting the lambda (or mu)-voltage curve for a specific bus you merely need to use the option ‘cpf.plot.bus’. results = runcpf(<basecase>,<targetcase>,mpoption(‘cpf.plot.level’,2,cpf.plot.bus,<bus#>); Please read the Continuation Power Flow chapter in the MATPOWER manual for a list of all the available options. Shri From: Aaqib Peerzada <[email protected]<mailto:[email protected]>> Reply-To: MATPOWER discussion forum <[email protected]<mailto:[email protected]>> Date: Sunday, March 5, 2017 at 1:37 PM To: MATPOWER discussion forum <[email protected]<mailto:[email protected]>> Subject: Re: CPF Question Hello Shri Thanks for getting back. I'd like to make my situation more clear. My work involves scaling up the all the loads in a power network in an incremental fashion up until the power flow equations become unfeasible. So I progressively stress the system by increasing all the loads through a load multiplier factor, lets call it mu. As I do this, the system will not converge for some value of mu, in case of 39 bus system, mu=1.239, which means the system collapses when all loads are scaled up by a factor of 1.239 Now I'd like to plot the nose curve (FULL) of any arbitrary bus using the CPF in MATPOWER. So ideally what I want is bus voltage plotted with mu. Can i get additional insights in to how can I modify the default callback function keeping in view my requirements? Thanks, Aaqib On Sun, Mar 5, 2017 at 12:22 PM, Abhyankar, Shrirang G. <[email protected]<mailto:[email protected]>> wrote: Hello Aaqib, There is no in-built function in MATPOWER to plot what you need. However, you can do so easily in two ways: 1. Modify the default callback function, cpf_default_callback.m, to plot the active power - voltage curve. Currently, it is set to plot lambda-voltage curve (both predicted and corrected). 2. runcpf’s output struct stores all the states for each continuation step in its cpf field (results.cpf). You can use these values to create the active power-voltage curve. Hope this helps, Shri From: Aaqib Peerzada <[email protected]<mailto:[email protected]>> Reply-To: MATPOWER discussion forum <[email protected]<mailto:[email protected]>> Date: Friday, March 3, 2017 at 9:10 PM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: CPF Question Dear Dr. Zimmerman and Friends I have a question regarding CPF in Matpower. In matpower the CPF algorithm plots the bus voltage against the continuation parameter (λ). However I'd like to plot the voltage against the active power at a bus(abscissa ). Is there any specific function that can let me do that or do i need to write some additional code for accomplishing this? Thanks -- Aaqib A Peerzada -- Aaqib A Peerzada Graduate Student Department of Electrical and Computer Engineering Wisenbaker Engineering Research Center Texas A&M University College Station, Texas United States. Phone # 979-739-2799 Email: [email protected]<mailto:[email protected]>
