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As investments in photovoltaic distributed generations (PVDG) become more attractive, medium and low-voltage networks may be impacted by this intermittent source. In this sense, power quality studies are essential to ensure continuity and reliability in power supply, especially in priority loads, such as industries connected to the medium-voltage network. This paper aims to analyze the impacts on power quality of industries fed in medium-voltage (MV) for different penetration levels of intermittent PV generation installed in low-voltage (LV) networks. Two industries were modeled in different buses on IEEE 8500-node test system, simulated in the OpenDSS program. The analysis parameters are based on steadystate voltage, power factor, and voltage imbalance for each industry. The results show violation in steady-state voltage starting in 5.5 MW and 27.5 MW of PVDG penetration in the MV and LV buses, for both industries, respectively. In addition, voltage imbalance problems are seen in 100 % of PVDG penetration for the industry at the end of the feeder. [ABSTRACT FROM AUTHOR]

This paper presents a comparative analysis for two alternatives of industrial substation arrangement with selective secondary radial type: first with one main transformer and one reserve and the second one with two main transformers and one reserve. The analysis are based on the power flow calculation, short circuit and reliability indices using the Electrical Power System Analysis Software (ETAP) and on the acquisition costs of equipment and materials. The analysis' methodology application in both alternatives is presented and the results are analyzed and compared as well. [ABSTRACT FROM AUTHOR]