Hi MatPower users:
I'm now using MatPower to simulate the power redistribution in a cascading
failure events. However, I met some convergence issue using AC power flow to
compute the power redistribution.
Here is what I did:
-- Use 'case2383wp' as the dataset and set branch power constraints using N-1
security constraints.
-- Randomly select 100 line tripped as the initial line failure.
-- Extract islands and run AC power flow for each islands with at least one
generator.
-- Find new line failures and redo step 3 until there is no new failure.
AC power flow succeed for the first round of computing the redistribution.
However, it turns not to converge for the second round for a large connected
network [see attached case_info]. On the other hand, if I change to run DC
power flow, the algorithm always gives good results.
In addition, I tried the suggestion on FAQ 5v. Most of time runcpf doesn't
converge either. Any suggestions on how to deal with the convergence issue for
AC power flow?
Regards,
Chen
case_info(mpc)
Checking connectivity ... single fully connected network
Elapsed time is 0.106501 seconds.
================================================================================
Full
System
Number of: ----------
buses 2060
loads 1599
on 1599
off -
fixed 1599
dispatchable -
on -
off -
generators 290
on 290
off -
shunt elements -
branches 2489
on 2412
off 77
ties (off) -
Load
active (MW)
dispatched 21508.1
fixed 21508.1
dispatchable -
nominal 21508.1
on 21508.1
off -
fixed 21508.1
dispatchable -
on -
off -
reactive (MVAr)
dispatched 7176.0
fixed 7176.0
dispatchable -
nominal 7176.0
on 7176.0
off -
fixed 7176.0
dispatchable -
on -
off -
Generation
active (MW)
dispatched 21941.4
max capacity 26111.4
on 26111.4
off -
min capacity 9146.5
on 9146.5
off -
reactive (MVAr)
dispatched 6286.3
max capacity 416899.0
on 416899.0
off -
min capacity -403083.0
on -403083.0
off -
Shunt Injections
active (MW) -
reactive (MVAr) -
Branch Losses
active (MW) -
reactive (MVAr) -
DC line
export (MW)
dispatch -
max capacity -
on -
off -
min capacity -
on -
off -
Reference Buses
num of ref buses 1
ref bus numbers 18
