Operation of the load flow for isolated sections - MATPOWER

[Andrey Vieira]

Good afternoon people! By performing load flow tests  in IEEE radials feeders 
cases,
such as 33, 69, 84 bars, I noticed that the study does not work when I leave 
isolated
sections (eg in the case 33 buses, runpf('case33'), opening section 3-23 causes 
error). Is there any
 way in MATPOWER to perform load flow tests with isolated branches?