A new utility interactive inverter for solar power generation was developed with transformer-less high impedance DC link configuration, which can realize compactness and high efficiency. The high impedance DC link structure, which reduces a value of the interstage capacitor to about 1/100, is evaluated for its waveform control of the output current. This paper describes the high impedance DC link typed circuit configuration and its operating principle. A control system delivering high quality output current is proposed. The newly developed utility interactive inverter has the maximum efficiency 95.5% or more and a compact size of 550mm×300mm×124mm.
