Reliability Analysis of MV Electric Distribution Networks Including Distributed Generation and ICT Infrastructure

Abstract

In recent years, the increased distributed generation (DG) capacity in electric distribution systems has been observed. Therefore, it is necessary to research existing structures of distribution networks as well as to develop new (future) system structures. There are many works on the reliability of distribution systems with installed DG sources. This paper deals with a reliability analysis for both present and future medium voltage (MV) electric distribution system structures. The impact of DG technology used and energy source location on the power supply reliability has been analyzed. The reliability models of electrical power devices, conventional and renewable energy sources as well as information and communications technology (ICT) components have been proposed. Main contribution of this paper are the results of performed calculations, which have been analyzed for specific system structures (two typical present network structures and two future network structures), using detailed information on DG types, their locations and power capacities, as well as distribution system automation applied (automatic stand-by switching on—ASS and automatic power restoration—APR). The reliability of the smart grid consisting of the distribution network and the coupled communications network was simulated and assessed. The observations and conclusions based on calculation results have been made. More detailed modeling and consideration of system automation of distribution grids with DG units coupled with the communication systems allows the design and application of more reliable MV network structures.

Reliability Evaluation of Radial Distribution System with different locations and ratings of Photovoltaic

“…Distribution system with PV unit at B/B5 The values of system performance indices like SAIFI, SAIDI, ENS and ASAI, for four different scenarios are obtained in Table 6 using Eq. ( 4) to (7). From the results in Table 6, it is observed that SAIDI and ENS are decreased from scenario 1 to scenario 4.…”

“…For the capacity of 1.5 MW,1.85 MW,2.97 MW of PV and for different location of PV, system reliability indices are calculated using Eq. from (4) to (7) and radial distribution network is reliable when PV located at busbar 5. This comparison highlights how the placement of PV systems affects the SAIDI and ENS under these specific conditions.…”

“…As a result, there has been significant research attention towards evaluating the reliability of distribution systems, especially when incorporating Wind Turbine Generators (WTG), Energy Storage Systems (ESS), and Photovoltaic (PV) technologies. Previous studies have investigated how renewable Distributed Generation and battery storage units impact the reliability of standard distribution systems [7]. In [8], explored the features of ESS for fine-tuning power system factors like losses, efficiency, reliability, and energy expenses.…”

Innovative Method for Reliability Assessment of Power Systems: From Components Modeling to Key Indicators Evaluation

“…Furthermore, systemic reliability indices [29] are calculated for the power system under investigation reported in Table 5. According to SAIFI and SAIDI values, each customer of the considered urban hybrid grid averagely experiences 11 min of outages in a year.…”