A New Common Grounded Nine-Level Grid-Tied Inverter with Voltage Boosting Feature

Common grounded voltage source inverters are become very attractive in the photovoltaic (PV) grid-connected applications. In this paper a novel single input common grounded nine-level grid-connected inverter is presented. The proposed grid-tied inverter consists of eight switches, two diodes and three self-balanced capacitors. The proposed inverter can provide the voltage boosting feature with the voltage gain factor of 4 using the switched-capacitor strategy. In the suggested topology the neutral of the power grid is tied to the negative polarity of the input power dc supply, directly. Therefore, common mode voltage is reduced and leakage current concern is solved. In order to handle both powers (active and reactive), the current control technique is applied. Therefore, the proposed inverter can inject a high quality sinusoidal current to the power grid. Finally, the experimental results of 770 W prototype validate the good performance of the recommended inverter.