Optimal sizing and allocation of DGs for real power loss reduction and voltage profile improvement in radial L.V networks

Abstract

The power produced from renewable Distributed Generators (DGs) units close to load centers increases system reliability, reduces losses, improves voltage profile as well as reduces fossil fuel consumption, which reduces the harm done to the environment. Achieving such benefits requires the careful selection of DGs locations and size. In this paper, a method based on a novel analytical approach for optimal allocation (sizing and siting) of DGs with the aim of reducing the total real power loss subject to specific assigned constraints in the radial distribution network is introduced. A computational method has been utilized to identify the optimal candidate locations for DGs, where the optimal sizes of DG units at the identified locations are evaluated by optimizing the loss saving equations, as well as the voltage drop on feeder. The proposed method has been tested and validated on a radial feeder in the Bethlehem district in the Jerusalem Distribution Electricity Company (JDECO) concession area. The test system consists of seven nodes and eleven 0.4 KV-buses and feeds five household loads. It has been found that a significant loss saving, as well as voltage profile improvement can be obtained by the appropriate selection of size and location of the DG units within the tested system using the proposed analytical method. The design has been simulated and verified using the NEPLAN simulator.