Abstract
Line shunts are usually ignored by various power flow (PF) models in
distribution system analysis, planning and optimization. However,
“charging effects” from line shunts of underground/submarine power
cables would cause non-negligible model errors for these commonly used
PF models. In this brief, we propose a modified linear Distflow model
(LinDist) with line shunts (LinDistS) to address relevant model errors.
The strength of the proposed model not only lies in a straightforward
structure like LinDist, but also maintaining the linearity after further
considering three-phase unbalanced systems. The linearization error of
voltage component is theoretically analyzed. Case studies show that
compared with non-linear and linear models, LinDistS achieves the
descent calculation accuracy and efficiency in large scale distribution
systems.