A Novel Analytical Approach for Optimal Placement and Sizing of Distributed Generations in Radial Electrical Energy Distribution Systems

Sasan Azad,Morteza Nazari Heris,Mohammad Mehdi Amiri,Ali Mosallanejad,Mohammad Taghi Ameli

doi:10.3390/su131810224

Sasan Azad, Morteza Nazari Heris + Show 3 more

Open Access

https://doi.org/10.3390/su131810224

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Abstract

Considering the strong influence of distributed generation (DG) in electric distribution systems and its impact on network voltage losses and stability, a new challenge has appeared for such systems. In this study, a novel analytical algorithm is proposed to distinguish the optimal location and size of DGs in radial distribution networks based on a new combined index (CI) to reduce active power losses and improve system voltage profiles. To obtain the CI, active power losses and voltage stability indexes were used in the proposed approach. The CI index with sensitivity analysis was effective in decreasing power losses and improving voltage stability. Optimal DG size was determined based on a search algorithm to reduce active power losses. The considered scheme was examined through IEEE 12-bus and 33-bus radial distribution test systems (RDTS), and the obtained results were compared and validated in comparison with other available methods. The results and analysis verified the effectiveness of the proposed algorithm in reducing power losses and improving the distribution system voltage profiles by determining the appropriate location and optimal DG size. In IEEE 12 and 33 bus networks, the minimum voltage increased from 0.9434 p.u and 0.9039 p.u to 0.9907 p.u and 0.9402 p.u, respectively. Additionally, the annual cost of energy losses decreased by 78.23% and 64.37%, respectively.

Highlights

Nowadays, the need for electricity consumption has increased, considering the increment of domestic, industrial, commercial, and agricultural consumption due to the growth of the world’s population and economic development
Based on the proposed combined index (CI) method, distributed generation (DG) were studied in networks to increase the voltage stability margin and reduce power losses
The voltage stability index is obtained from a mathematical point of view using the voltage collapse feature, which is of great importance

Summary

Introduction

The need for electricity consumption has increased, considering the increment of domestic, industrial, commercial, and agricultural consumption due to the growth of the world’s population and economic development. By investing in power plant structures, the development of transmission and distribution lines can meet the demand for electricity. Investing in these sectors, in addition to requiring a lot of time, imposes huge costs on governments and the electricity industry. Despite the advantages of installing distributed generation (DG) resources, their challenges and technical barriers need to be addressed. In addition to having advantages such as voltage profile improvement [1], reduction of losses [2], increased reliability [3], and reduced overall harmonic distortion of voltage [1], DG construction has requirements that need to be considered. Putting DG in a non-optimal way in the distribution system may weaken voltage stability, reduce

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