Korea Electric Power Research Institute (KEPRI) has established a PV inverter test system based on SPS linear power amplifier. It is the largest linear power amplifier system in the world. It can directly measure 350KW medium-sized PV inverters. The physical map of some cabinets is as below.
The entire inverter test system consists of 4 sets of 100KW photovoltaic simulators, 2 sets of 90KW AC power supplies, 2 sets of 175KW power feedback units and 3 sets of 15KW RLC loads. The principle is as follows: