On the assessment of voltage ride-through needs of the power transmission Grid

This paper discusses methods and criteria for the assessment of the low voltage ride-through (LVRT) needs of the power grid. Simulation techniques are used to investigate both how voltage dips caused by short-circuits spread over the grid and what impact do they cause in the operation performance of power systems with wind generation. The analysis is performed for wind turbines (WT) with different LVRT characteristics. It is shown that, depending on system´s topology characteristics and the voltage level of WT´s point of connection, ride-through needs may be different throughout power systems, especially those of continental countries as Brazil. As a conclusion, it is possible to have less severe LVRT requirements without risking system operation security.