The energy drawn from the wind power plant and photovoltaics is considered to be essential sources in the recent distributed generation (DG) of electrical power. Since a day-to-day load demand for electricity is increasing rapidly and therefore the generation of power, needs to be improved for balancing the current demand. Because of this growing demand, non-renewable energy sources are on the brink of extinction. In order to solve this problem, the concept of integration of renewable energy sources has been introduced in the electrical distribution system and thereby improves the power quality and reliability to meet out the existing needs of the customers. Hence, the concept of installation of the DG has an impact on the operation and characteristics of the electrical distribution system. Installing the DG units near to the load centers may solve the basic problems such as power losses and voltage drops. The overall system is simulated in MATLAB environment in which, the three-phase grid-connected photovoltaic system is integrated with the parallel loads. The outputs are being measured in the form of the power, voltage and current at various points in the existing system and are analyzed in both the normal and faulty conditions. At Point of Common Coupling (PCC), variations in voltage and current under different types of fault conditions, intentional islanding and nuisance tripping of load cases are analyzed without protection device. © 2021, Springer Nature Singapore Pte Ltd.