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Although power electronic based generation sources such as solar photovoltaic plants and wind farms are gaining enormous popularity, conventional distributed energy resources (DERs) are commonly used and integrated onto distribution systems. The main reasons are the improving the economy of generation, controllability and maturity of the technology that simplifies operation and maintenance of the plant. Contrary to common belief, recent technological enhancements have brought about many engine driven generation types which are classified as clean (green) sources. This paper deals with the topic of modeling and benchmarking conventional synchronous generator based DERs for application in distribution systems. The DER model incorporates some new aspects of generation controls such as voltage regulation and reactive power compensation that are being asked for by some utilities to help accommodate integration onto existing distribution feeders while minimizing adverse effects. The introduced DER model is applied to and studied on a benchmark distribution network to demonstrate typical applications and impact investigations.