Technical requirements for the connection of dispersed generation to the grid

The penetration of dispersed generation (DG) sources in the grids is constantly increasing, as a result of both technological advancements and institutional changes in the electric power industry. The connection of new installations is often hindered by a variety of factors, including technical considerations and requirements, usually resolved at the expense of the investor. As the interest for installing new generation facilities escalates, the adoption of transparent and easily applicable technical evaluation procedures becomes imperative. In this paper, the methodology and limits adopted in the connection guide of the Greek utility are outlined. Issues addressed are the steady state and fast voltage variations, as well as flicker and harmonic emissions. Simplified evaluation procedures are proposed, largely based on the relevant IEC publications, which are suitable for practical situations.