Efficient Single-Phase Grid Connected Transformer-less Inverter with Active and Reactive Power Control

High efficiency, Moderate cost, and less weight, transformer-less inverter for grid connected photovoltaic systems are gaining popularity. As a result, a number of transformer-free topologies have been developed and confirmed using only active power injection. Almost every worldwide legislation has recently required that grid-connected PV inverters handle a certain amount of imaginary power. Grid connected PV inverters within the rated power less than 3.5kVA should achieve a power factor of 0.95, from VDE-AR-N 4105 standard. For grid connected Photovoltaic system with reactive power regulation, a novel high efficiency transformerless architecture has been discussed in this research. The new topology structure is given, as well as the detailed operation concept with imaginary power flow. The suggested methodology high-frequency common-mode (CM) model and control are investigated. Using MOSFET switches to increase overall efficiency is possible thanks to the suggested scheme has an implicit circuit structure, which inhibits reverse recovery even when imaginary power is fed into the system. Less leakage current is achieved by keeping the common mode voltage constant at the midpoint of the input supply voltage. In conclusion to that, a one-kilowatt sample is created and examined to validate the proposed architecture. Experiments show that the suggested architecture may inculcate imaginary power into the utility grid without producing any additional leakage current. The proposed topology’s European and maximum efficiency are measured and determined to be 98.54 percent and 98.29 percent, respectively.