DC bus imbalance in a split capacitor based rectifier or inverter system is a widely studied issue. In this paper the DC bus imbalance problem has been studied for a three phase four wire grid connected inverter where the midpoint of the split capacitor is connected to the neutral of grid. The problem has been analysed from common mode point of view and subsequently a low frequency common mode ...

The overall efficiency of grid-connected photovoltaic power generation systems depends on the efficiency of the DC-into-AC conversion. Therefore, a key consideration in the design and operation of inverters is how to achieve high efficiency with power output. This paper presents a concept of an inverter for grid connected photovoltaic arrays which can synchronise a sinusoidal current output wit...

Abstract: This paper presents a seamless transition method for a droop-controlled inverter. The droop control is suitable to make the inverter work as a voltage source in both islanded and grid-connected modes, however, the transfer between theses modes can result in a big inrush current that may damage the system. The proposed method allows the droop-controlled inverter to improve the transien...

This study proposes a soft switched Output Current Sourcing (OCS) grid connected inverter that applies a high frequency isolation transformer. Current sourcing at the output implies that, ideally, the injected current will be independent on the load voltage. The current injected to the line is controlled by varying the switching frequency and dithering at low currents. The system does not requi...

This paper presents a study on Proportional Resonant (PR) current control with additional PR harmonic compensators for Grid Connected Photovoltaic (PV) Inverters. Both simulation and experimental results will be presented. Testing was carried out on a 3kW Grid-Connected PV Inverter which was designed and constructed for this research. Keywords—Inverters, Proportional-Resonant Controllers, Harmo...

This paper presents the mathematical modeling of three-phase grid connected inverter fed by Solar Photovoltaic (SPV) system with Maximum Power Point Tracking (MPPT). Analysis has been carried out to choose the proper modulation index for maximum output for three-phase inverter. With this modulation index, the variation of the active and reactive power for different loads has been presented alon...

This paper discusses a single-phase three-level current source inverter (CSI) driven by a single gate-drive power supply in both chopper and inverter, and its feasibility on grid connected photovoltaic system application. Using this new topology, the complexity of the chopper and inverter circuitry is dramatically reduced by using single gate-drive power supply for all power switches. The circu...