A Single-Stage Bimodal Transformerless Inverter with Common-Ground and Buck-Boost Features

This paper proposes a single-phase, single-stage common-ground inverter with non-electrolytic capacitor and buck-boost ability. The proposed is employed by boost stage DC-DC converter bimodal circuit, which makes it satisfactory for PV systems wide input voltage range lower switch stress. leakage current of the can effectively suppress because parasitic between panel ground shortened. In addition, does not include electrolytic capacitors, reduces equivalent series resistance capacitors also size system. topology, operating principle, PWM control method are given. design guidelines components comparative studies provided. A 500 W laboratory prototype built to verify correctness simulation theoretical analysis.