Finally, the central inverter interfaces a whole PV array to the grid through a single inverter. The array is composed of parallel-connected strings. A blocking diode in series to each string is necessary to prevent them from acting as load when partial shading or mismatch occurs. Because the whole array is connected to a single inverter, this configuration can only provide a single MPPT operation, leading to the lowest MPPT efficiency of all configurations. Nevertheless, it provides a simples tructure, reliable, and efficient converter, making it one of the most common solutions for large-scale PV plants. Since they operate at an LV (11,000 V), the limit of insulated-gate bipolar transistor (IGBT) technology enables converters of up to 850 kW. To increase the power rating, some manufacturers commercialize two central inverters connected through a 12-pulse transformer, with a rating up to 1.6 MW. Nevertheless, very large PV plants can currently reach several hundreds of megawatts. Therefore, several hundreds of dual central inverters are needed in large PV farms.