Electro-mechanical transients of small plant generators connected to a transmission grid

Small generators are commonly incorporated in the electrical systems of large industrial plants, i.e. oil, gas, and petrochemical industries, for ensuring continuous and high quality energy supply to critical loads. In case that local generation is enough to satisfy the demand of the plant, then the interconnection with the public grid is commonly used as an important support for emergency conditions. As a result of the deregulation of electric industry the number of industrial plants with local generation has increased, as well as the interconnections with the transmission grid aiming to sell the excess of power generated. This paper reports on the impact study on the dynamical performance of interconnected industrial power systems after loosing the interconnection with the public grid under exporting an importing conditions.