Photovoltaic power systems: Electromagnetic compatibility considerations for network interconnection

In recent years, an increasing amount of renewable energy, among which are solar, wind and biomass, has been connected to medium voltage and high voltage power systems. Solar power has been to present an equivalent to almost 100 GWp development and forecasts for 2030 indicate injection into the network of about 0.6% of global energy. Although this energy is unlimited and easy to install, even with the state of the art, the PV module has a lower conversion efficiency than traditional systems. On the other hand, the randomness of solar irradiation and low short circuit power of PV systems based on semiconductors must be taken into account. In this paper we want to highlight the electromagnetic compatibility problem of these systems when connected to weak low voltage and medium voltage power systems supplying nonlinear loads (e.g. converters) and linear loads, in order to establish the PV power limit that can be connected to the power system so that such loads work in a proper way.