The use of power-electronics-based devices in distribution generation seeks to improve energy quality and reduce costs. The inverter-based distributed generator, that works in different operation modes, has emerged as a promising technology. In a high distributed generation penetration scenario it is important to know the voltage profile and fault information due to the uncertainty in the generator operation and the impact that have on the network. This study aims to use two proposed methods of analysis: for power flow, based on backward/forward sweep method, and short-circuit, based on hybrid impedance matrix, that considers the inverter operation modes and represents each generator as a voltage-controlled current source. The chosen network is the IEEE 34-Node Test Feeder with a generator on each load per phase. The voltage profiles obtained will be validated with a Simulink/Matlab phasorial model. The results show an average error of 2.39% and a gain in voltage profile processing time of 2185.24%, making its use consistent for larger systems.

In consequence to the worldwide growth of distributed generation (DG), especially photovoltaic (PV), several studies discuss on the impacts on the voltage profile of the distribution feeders. However, they do not apply Brazilian real electricity regulation for DG and PV systems. This article proposes to study the voltage Profile of the IEEE 13-Node radial test feeder with high PV penetration level with the presence of the voltage regulator (OLTC) connected to the substation output. The results obtained for the case without voltage regulator and with the presence of the regulator will be compared under the regulation of electricity of Brazilians Regulatory Agency of Electric Energy (ANEEL) and Electrical System Operator (ONS). The results show that PV generators operating with fixed PF (PF = 1), and with the presence of the voltage regulator (OLTC) the voltage values and the electricity quality levels are directly affected.