Solar inverter has a boosting effect

Since capacitor value directly depends on the maximum power, most of the inverters use electrolytic capacitors parallel to the PV module. This element reduces the lifetime and increases the cost of the photovoltaic system , . Thus, the solar PV inverter desires to use reduced capacitance value.

The primary issues for boosting inverters are low efficiency, high price, and large size. The analysis shows that using fewer high-frequency switches and lower power rating components can mitigate the disadvantages of these topologies.

Transformerless inverters are considered desirable for a photovoltaic system. Multi-stage topologies can be a good choice in non-isolated inverters, but they require two or more stages for converting solar PV power to grid power as shown in Fig. 5, leading to reduced efficiency, , , , .

This element reduces the lifetime and increases the cost of the photovoltaic system, . Thus, the solar PV inverter desires to use reduced capacitance value. Boost inverter uses dc link inductors to maintain a constant current, thus less capacitance value is used in dc link.

The figure clearly directs that the power loss in 4 switch boost inverters is less compared to other topologies. In this regard inverters with less number of high-frequency switches produces lower power loss due to conduction and switching.

The simulated efficiency is 93.85%, while the actual efficiency is 92.2%. In addition, the maximum efficiency achieved in simulation is 98.15%, whereas the measured efficiency is ~97% for an output power of 400 watts. The paper presented a novel topology for single-phase, single-stage boost inverters, including a shared ground.