Dear Matpower Folks:
I have larger network that is a solved load flow case from an ISO.
The AC power flow converges fine, but neither AC nor DC OPF solve.
I supplied my own estimated generator costs, and perturbed them so that
none are identical.
I get the following error:
>> mpc = iso2015sum
mpc =
version: '2'
baseMVA: 100
bus: [7108x13 double]
gen: [720x25 double]
branch: [8930x13 double]
bus_name: {7108x1 cell}
dcline: [4x17 double]
gencost: [720x6 double]
>> results = rundcopf(mpc)
opf_setup: Warning: Multiple reference buses.
For a system with islands, a reference bus in each island
may help convergence, but in a fully connected system such
a situation is probably not reasonable.
MATPOWER Version 6.0b2, 01-Nov-2016 -- DC Optimal Power Flow
The interior-point-legacy algorithm uses a built-in starting point;
ignoring supplied X0.
Exiting: One or more of the residuals, duality gap, or total relative
error
has stalled:
the primal appears to be infeasible and the dual unbounded since
the dual objective > 1e+10
and the primal objective > -1e+6.
>>>>> Did NOT converge (7.52 seconds) <<<<<
results =
version: '2'
baseMVA: 100
bus: [7108x17 double]
gen: [720x25 double]
branch: [8930x21 double]
bus_name: {7108x1 cell}
dcline: [4x17 double]
gencost: [720x6 double]
order: [1x1 struct]
om: [1x1 opf_model]
x: [7700x1 double]
mu: [1x1 struct]
f: 2.1192e+06
var: [1x1 struct]
lin: [1x1 struct]
et: 7.5220
success: 0
raw: [1x1 struct]
The system has several complex features:
4 HVDC lines
several storage resources as generators
4 buses as reference/slack bus type
many "isolated" bus types ("4").
Can you suggest where in the results I can look to diagnose the problem?
Thanks so much!
Mort Webster
--
Mort Webster
Associate Professor of Energy Engineering
Dept of Energy and Mineral Engineering
Pennsylvania State University
University Park, PA 16802
(814) 863-1640
m...@psu.edu
