access icon free Extended fast decoupled power flow for reconfiguration networks in distribution systems

© The Institution of Engineering and Technology
Received 23/02/2018, Accepted 16/10/2018, Revised 20/09/2018, Published 18/10/2018

This study proposes a power flow methodology focused on the need for reconfiguration analysis in modern distribution networks. The proposal is based on the extended fast decoupled Newton–Raphson method, which uses the information of the network switching equipment status (open or closed). To deal with eventual islanding during a reconfiguration procedure, a numerical observability technique used in state estimation analysis has been adapted for topological processing when network segments are disconnected from voltage references. A complex per unit normalisation technique is employed so that the power flow calculation by the fast decoupled approach is viable, even for networks having high R/X ratio lines. Simulation results considering two distribution feeders, one of large size, with different topological conditions are presented. The performance of the proposed methodology qualifies it as a relevant computational tool to support network reconfiguration studies involving emergent distribution systems.

Inspec keywords: distribution networks; Newton-Raphson method; load flow; power system state estimation

Other keywords: distribution networks; state estimation analysis; reconfiguration procedure; extended fast decoupled Newton-Raphson method; voltage references; reconfiguration analysis; complex-per-unit normalisation technique; computational tool; power flow calculation; topological processing; high R-X ratio lines; reconfiguration networks; topological conditions; network switching equipment status; extended fast decoupled power flow; numerical observability technique; distribution systems; eventual islanding

Subjects: Distribution networks; Interpolation and function approximation (numerical analysis)

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