Re: non convergence of 69 bus radial distribution system

2015-01-16 Thread Pinak Panda
Dear Power Globers, Thank you Idris for your input I have updated the case file and it converged. I am working on changing topology of the network and finding out it's effects.If suppose I want to use the tie lines and for restraining radility opens five section switches say [3 43 48 24 18].

Re: non convergence of 69 bus radial distribution system

2015-01-16 Thread Abhyankar, Shrirang G.
My guess is that opening those lines is creating islands. Use the function case_info to extract the islands. See http://www.pserc.cornell.edu//matpower/#pfconvergence for info on non-convergent power flow. Shri From: Pinak Panda pinak.pand...@gmail.commailto:pinak.pand...@gmail.com Reply-To:

Re: Matpower- Continuation Power Flow

2015-01-16 Thread Ray Zimmerman
I’ve just made some changes to the dev version to handle this situation gracefully. It now prints out a messages telling you that your base and target cases are identical and returns after 0 iterations, rather than getting stuck in an infinite loop. Ray On Jan 15, 2015, at 5:25 PM,

Re: extracting islands in extremely large systems

2015-01-16 Thread Ray Zimmerman
The find_islands() and case_info() function return the bus numbers in each island, as well as isolated buses, and case_info() also prints out lots of summary info about each island. If you actually want to extract each island into it’s own MATPOWER case, use extract_islands(). Ray On

Re: Matpower- Continuation Power Flow

2015-01-16 Thread arun s nair
Hi Thank you Abhyanker for your input, the example in the manual worked. I am really new to Matpower and I am learning it from scratch. My intention is to get the critical value of power and voltage values(Nose point of the PV curve) of a particular bus, Can anyone please tell me is it possible

Re: Matpower- Continuation Power Flow

2015-01-16 Thread Abhyankar, Shrirang G.
runcpf returns a MATPOWER case struct that has the loading/genration and the voltages at its last continuation step. By using the option 'cpf_stop_at_nose', the continuation power flow will stop when it is near the nose point. You can then extract the voltages and power from the MATPOWER case