  Topology identification (TI) in distribution networks is a challenging task
due to the limited measurement resources and therefore the inevitable need to
use pseudo-measurements that are often inaccurate. To address this issue, a new
method is proposed in this paper to integrate harmonic synchrophasors into the
TI problem in order to enhance TI accuracy in distribution networks. In this
method, topology identification is done jointly based on both fundamental
synchrophasor measurements and harmonic synchrophasor measurements. This is
done by formulating and then solving a mixed-integer linear programming (MILP)
problem. Furthermore, an analysis is provided to capture the number of and the
location of harmonic sources and sensors that are needed to ensure full
observability. The benefits of the proposed TI scheme are compared against
those of the traditional scheme that utilizes only the fundamental
measurements. Finally, through numerical simulations on the IEEE 33-Bus power
system, it is shown that the proposed scheme is considerably accurate compared
to the traditional scheme in topology identification.
