amir ali Hosseini wrote:
Dear Sir,
i trying make a new network. 37 bus
but ! after runpf .i have warning!
can you help me ?
thanks a lot.
my warning is :
Warning: Matrix is singular to working precision.
> In newtonpf (line 89)
In runpf (line 204)
find attachment .
new network with 37 node.
This is the output of case_info.m applied to your case file:
>> case_info(mpc)
Checking connectivity ... single connected network, plus 1 isolated bus
Elapsed time is 0.245606 seconds.
================================================================================
Full Island Isolated
System 1 Buses
Number of: ---------- ---------- ----------
buses 37 36 1
loads 36 35 1
on 36 35 1
off - - -
fixed 36 35 1
dispatchable - - -
on - - -
off - - -
generators 1 1 -
on 1 1 -
off - - -
shunt elements - - -
branches 36 36 -
on 36 36 -
off - - -
ties (off) - - -
Load
active (MW)
dispatched 9.6 9.5 0.1
fixed 9.6 9.5 0.1
dispatchable - - -
curtailed - - -
nominal 9.6 9.5 0.1
on 9.6 9.5 0.1
off - - -
fixed 9.6 9.5 0.1
dispatchable - - -
on - - -
off - - -
reactive (MVAr)
dispatched 4.6 4.6 0.0
fixed 4.6 4.6 0.0
dispatchable - - -
curtailed - - -
nominal 4.6 4.6 0.0
on 4.6 4.6 0.0
off - - -
fixed 4.6 4.6 0.0
dispatchable - - -
on - - -
off - - -
Generation
active (MW)
dispatched 11.5 11.5 -
max capacity 10.0 10.0 -
on 10.0 10.0 -
off - - -
min capacity - - -
on - - -
off - - -
reactive (MVAr)
dispatched - - -
max capacity 1.5 1.5 -
on 1.5 1.5 -
off - - -
min capacity -0.2 -0.2 -
on -0.2 -0.2 -
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 1 0
ref bus numbers 1 1
>>
It seems that you have an isolated bus; is this what you intend in your
case file?
carlos.
