Eliminating the leakage current is one of most important issues for transformer less inverters in grid connected photovoltaic applications. The technical challenge is how to keep the common mode voltage constant to reduce the leakage current. For this purpose an improved single phase transformer less inverter is proposed. It has two additional switches connected in the dc side. The PWM pulses f...

Second and third-order passive filters (LC and LCL) are interesting filters to use for grid-connected PWM inverters. Because of the stability problems of these filters around resonance frequency, series and damping resistor can be add to an LCL filter. However, the resistor value has impact on the filter respond, voltage and current harmonic distortion and filter power loss. In this paper, the ...

Abstract The Photovoltaic grid-connected inverter is an essential equipment of photovoltaic system. Due to the disadvantages traditional PI control method for inverters, this paper adopts integral sliding mode variable structure inverters. Grid DC was introduced in detail strategy. Using Matlab simulation platform compare and analyze voltage compensation strategy From waveform output, current h...

Virtual oscillator control (VOC) is a type of nonlinear grid-forming controller for dc/ac inverters. Compared with the droop method, original VOC has faster transient response in islanded mode. However, its output voltage always contains third-order harmonic, resulting significant third-harmonic current, especially grid-connected In order to eliminate this notch-type filter typically employed, ...

Micro grids being a new developing technology operate in two distinct modes of operation, namely, the utility-grid-connected mode and the autonomous (or islanded) mode. In transition from the utility-grid-connected mode to the autonomous mode, the frequency of a micro grid can be seriously affected due to unbalance between power generation and power demand and at that moment, micro-sources may ...