A three phase unbalanced power flow method for secondary distribution system

Abstract

An economical load flow study is needed for automatic distribution network for designing, operation, economic dispatch, stability analysis & contingency analysis. This paper introduces an easy three phase unbalanced load flow technique which will handle unbalanced radial secondary distribution networks. The proposed technique uses the modified Forward-Backward technique that addresses the constant-power, constantimpedance and constant-current load models, regulators, transformers and switches. It solves an easy algebraic algorithmic expression of voltage magnitude. The suggested technique having better convergence rate and execution time is also less for any type of load model, size of the network, and resistance to reactance ratio of feeders.19-bus and 25 bus URDNs results are in agreement with the literature and show that the suggested technique is efficient and reliable.

Multi-Objective Optimal Allocation of Electric Vehicle Charging Stations and Distributed Generators in Radial Distribution Systems using Metaheuristic Optimization Algorithms

“…The cumulative real and reactive demand on the system is 3715kW and 2300kVar. The minimum voltage of 0.9038p.u is observed at bus number 18, which is outside of the prescribed limit of ±5% after executing the distribution power flow algorithm by using the forward-backward method [26]. Moreover, the cumulative active power loss of the system is 210.9897kW, and the cumulative reactive loss of the system is 143.1284kVar.…”

“…Radial Distribution System (RDS) has a large R/X ratio and because of this basic load flow tools such as Newton Raphson or fast decoupled approaches do not provide accurate results. An efficient load flow method is presented in [26] based on the forward-backward method for solving the power flows of RDS. The objectives of this study are minimizing power losses, AVDI, and enhancing VSI.…”