A Three-Phase Sensitivity-Based Approach for Smooth Line-Switching in
This paper deals with a new line-switching method that facilitates the
network reconfiguration of islanded microgrids. Its distinct features
include the ability to handle network asymmetries and the minimization
of the line current during the switching action. This is attained by
developing a sensitive-based three-phase model predictive method to
determine the operating set-points of the distributed generators (DGs)
that minimize the current of the candidate line participating in the
switching action. These set-points correspond to the positive-sequence
powers as well as the negative- and zero-sequence currents of all DGs.
Furthermore, the network constraints such as voltage limits and power
limits of DGs are always satisfied. Simulations are performed in a
balanced 33-bus islanded network as well as in the unbalanced IEEE
8500-node network to evaluate the performance of the proposed method.