A Five-Level Switched-Capacitor Based Transformerless Inverter With Boosting Capability for Grid-Tied PV Applications

Transformerless grid-connected inverters have attained a lot of research interest in renewable energy interface applications, due to certain promising properties like greater efficiency, light weight, affordable price, and tolerable power density. Among various types transformerless grid-tied photovoltaic (PV) inverters, multilevel (MLIs) are mostly popular their ability transmit reactive power, small filter size for reducing total harmonic distortion (THD) common-ground (CG) configuration mitigate the detrimental leakage current parasitic capacitances PV array. Again, among different MLIs systems, switched-capacitor (SC) based inverter topologies burning topic decades single source requirements producing output voltage. However, used single-phase five-level most existing SC topology requires at least two SCs conversion. In this paper, on is proposed, requiring only seven switches, no diode, capacitor, one dc voltage source. The proposed MLI also has auto-boosting capability. Notably, number switches operating high frequency limited three, which lowers down switching losses inverter. Rather than new topology, control scheme presented inject precisely regulated into grid that can govern both active support modes. In-depth comparisons between cutting-edge provided. All these claims validated through MATLAB/Simulink PLECS computer simulation environments. A laboratory-scaled prototype built tested simulated further validate effectiveness feasibility topology.