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The market acceptability of distributed energy resource (DER) technologies, as well as the gradual and consistent development in their penetration depth, have piqued interest in recent years. There has been a large increase in distributed photovoltaic (PV) generation that is interfaced with power distribution systems, and this trend is projected to continue. As a result, the integration, control, and optimal functioning of DER units has become a major priority in distribution system design and operation. Grid-connected distributed PV systems come in a variety of power levels, from modest single-phase residential roof-top systems to big three-phase multi-megawatt systems. The focus of this research is on analysing big, three-phase systems that include a power distribution system. A power electronic inverter is used to connect PV systems to the grid in all cases. Many of the critical aspects of PV generation are controlled by the inverter’s design and performance, hence adequate inverter models are required to analyse PV systems. This Paper has labelled several distributed generation (DG) models, including switching and average models, that are suitable for various study purposes, as well as distinct inverter control modes. Detecting and eliminating unintended islands during grid breakdown is a vital function of the inverters. Many active anti-islanding strategies with voltage and frequency positive feedback have been investigated in this Paper. The effectiveness of these strategies for integrating distributed resources with electric power systems has been evaluated in terms of the tripping times stipulated in IEEE Std. 1547 Using power systems analysis tools such as CYMDIST and POWERWORLD, the influence of distributed PV on the voltage profile of a distribution system was investigated using ASU as the test bed. The current IEEE 1547 compliant inverters do not regulate the system voltage. The system is also analysed, and the impact of distributed PV on fault current magnitude, both with and without reactive power injection, investigated.
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