Power quality monitoring, and in particular harmonic measurement, is becoming more and more critical in the power system. This is going around for many years, but recently it has also arrived to High Voltage systems. With the increased presence of Renewable Energies, in particular solar and wind power, and their use of inverter-based technologies, harmonic presence in High Voltage substations, particularly those connected to RE plants, has become an issue that needs to be addressed.

As you may know, the certification procedure for renewable plants in Spain is mandatory for connecting generation plants to the grid and it is in constant evolution.  In this article we explain the most important changes that have been made in the new technical standard (NTS) and how they can affect the grid connection of renewable plants.