Computational Techniques for Autonomous Microgrid Load Flow Analysis

Abstract

This paper attempts at developing simple, efficient, and fast converging load flow analysis techniques tailored to autonomous microgrids. Two modified backward forward sweep techniques have been developed in this work where the largest generator is chosen as slack generator, in the first method and all generator buses are modeled as slack buses in the second method. The second method incorporates the concept of distributed slack bus to update the real and reactive power generations in the microgrid. This paper has details on the development of these two methodologies and the efficacy of these methods is compared with the conventional Newton Raphson load flow method. The standard 33-bus distribution system has been transformed into an autonomous microgrid and used for evaluation of the proposed load flow methodologies. Matlab coding has been developed for validating the results.

Future Distribution Networks: A Review

“…The BFS class of solvers was initially developed for radial networks and then extended to meshed networks at the expense of additional iterations and/or increased divergence risks. In addition, they have topological limitations and a lack of generality, which is reflected in numerous case-by-case treatments in the literature for AC networks [123]. The UTM method proposed in [112] has network topology limitations (cannot be applied to meshed networks) and it requires a large number of iterations for convergence.…”

“…Another research study looked at switching to a 110 V DC system to replace an existing single-phase 220 V AC system or three three-phase 380 V AC system so that existing appliances can be utilized with fewer modifications [222]. The authors of [123] examined the new industry specification and global standard for data centers at 380 Vdc [29].…”

An efficient two stage stochastic optimal energy and reserve management in a microgrid

“…That is, the central values of current, voltage, and complex power are found out by executing deterministic OPF (see (1)) using SWT-PSO and modified backward-forward sweep power flow [34,35] to evaluate (37)-(39) which represent the complex line (i-j) currents, node voltages (ith node) and power flows respectively.…”