A Single-Stage Single-Phase Transformer-Less Doubly Grounded Grid-Connected PV Interface

A Single Phase Doubly Grounded Semi-Z-Source Inverter for Photovoltaic (PV) Systems with Maximum Power Point Tracking (MPPT)

“…Several transformer-less inverters with MPPT have been proposed in [6,[37][38][39][40][41][42][43] for PV system to overcome the abovementioned problems. Most of these topologies have no doubly grounded features.…”

“…Also, the overall system efficiency decreases because only one half of the PV has been utilized in the AC half cycle which results in more ripple voltage across PV modules. Another doubly grounded single phase transformer-less inverter has been proposed in [39] which utilizes only one PV array and one buck boost inductor, but to generate the negative half cycle of the AC voltage it requires three switches and one diode and for the positive half cycle it requires three switches and two diodes, which results in increased losses due to the large number of switches.…”

Switching Patterns and Steady-State Analysis of Grid-Connected and Stand-Alone Single-Stage Boost-Inverters for PV Applications

“…There are some related works in the literature regarding CSBI converters [6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

“…In [17], a single-phase, single-stage, doubly grounded, transformer-less PV interface, based on the buck-boost principle, is presented. The configuration is compact and uses fewer components.…”

“…In many topologies, there are only two HF switches that only one of them operates at any given half cycle of the grid voltage (The topologies [7,8,[10][11][12][13][14][15][16][17][18]). …”