<p>This manuscript proposes a time-series temperature-dependent
power flow method for unbalanced distribution networks consisting of
underground cables. A thermal circuit model for unbalanced three-phase multi-core
cables is developed to estimate the conductor temperature and resistance of
Medium and Low Voltage distribution networks. More specifically, a novel
approach is proposed to model and estimate the parameters of the three-phase
thermal circuit of 3/4-core cables, using the results of Finite Element Method and
Particle Swarm Optimization. The proposed approach is generic and can be
accurately applied to any kind of 3- or 4-core cables buried in homogeneous or
non-homogeneous soil. Furthermore, it is applicable in cases where one or more adjacent
cables exist. Using the proposed approach, the conductor temperature of each
phase can be individually and precisely calculated even in networks with highly
unbalanced loads. The proposed approach is expected to be an important tool for
simulating the steady state of unbalanced distribution networks and estimating
the conductor temperatures. The proposed thermal circuit is validated using two
4-core LV and one 3-core MV cables buried in different depths in homogeneous or
non-homogeneous soil. Time-series power flow for a whole year is performed in a
25-bus unbalanced LV network consisting of multicore underground cables.</p>
Time-Series Temperature-Dependent Power Flow Considering Unbalanced Thermoelectric Equivalent Circuits for Underground LV and MV Cables
