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Backward-Forward Sweep Based Power Flow Algorithm for Radial and Meshed AC-DC Distribution System

Developing a power flow methodology for the ACDC distribution network is a complex task when compared with a pure AC distribution network because of the involvement of power converters. In this work, the notion of the BackwardForward Sweep (BFS) approach in collaboration with graph theory and matrix algebra has been adopted for solving the power flow problem of both radial and mesh configured ACDC distribution networks. For this purpose, the per-unit current and voltage model of the 3-φ pulse width modulated (PWM) rectifier, 3-φ PWM inverter, and DC/DC power converter have been developed. The major benefit of the proposed algorithm is that it can provide a load flow solution incorporating various functional/control modes of the aforementioned converters. Most importantly, a generalized sensitivity matrix has been developed for computing the loop breakpoint allowing the approach to work both on mesh and radial networks. The viability of the proposed methodology has been investigated on several distribution networks. The test result shows the reasonability and precision of the proposed technique.