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In this paper, authors propose an advanced photovoltaic system based on the 15-Level PUC inverter. The proposed inverter has the advantage to operate with a single PV array while generating fifteen voltage levels. Even it is constituted from only eight switches and two capacitors; it can nevertheless offer a fifteen-level output voltage. In order to extract the maximum power from the PV panel, authors...
The main objective of this paper is to present and discuss out the high efficient, reliable and most effective solar energy based water pumping system. The proposed solar PV array based centrifugal water pumping system utilizing canonical switching cell (CSC) converter as an intermediate DC-DC converter for achieving highest possible efficiency to PV panel. The soft-starting of switched reluctance...
Although photovoltaic (PV) systems are generally based on Maximum Power Point Tracking (MPPT), many situations such as stand-alone systems or microgrids increasingly require the PV system to operate below maximum power. The problem here is that the power regulation becomes unstable when the MPP power is lower than the reference power as a result of a decrease in irradiance. This paper proposes a control...
A high performance boost converter for maximum power point tracking (MPPT) of photovoltaic (PV) systems is presented. The proposed boost converter uses a new active snubber to minimize losses in the switching and improve efficiency of the converter. For tracking the maximum power point of a PV array, a closed loop fuzzy logic based MPPT controller has been developed. The proposed boost converter is...
In an effort to utilize the solar energy effectively through power electronics converters (conditioners), a great deal of research is being carried out to meet the increasing demand for load. This paper proposes an experimental photovoltaic (PV) power conditioning system with line connection. The conditioner consists of a flying capacitors multi-cell inverter fed by a dc-dc boost converter. The boost...
This paper presents photovoltaic (PV) grid-connected power conditioning systems based on Z-source inverter. Using Z-source network, the system can work within a range of PV array output voltage wider than that of the conventional boost converter. It allows the use of the shoot-through switching state for boosting the input voltage, compensates dead-time effect which causes serious output voltage distortions...
In a grid-connected PV system using a QZSI(Quasi Z-Source Inverter), the capacitor voltage of an impedance network is controlled to be constant to track the MPP(Maximum Power Point) of a PV array and generate the reference output current. For higher efficiency of the system, if possible, the reference voltage of the capacitor should be set at a lower value. On the other hand, the reference voltage...
This paper presents power loss analysis of grid-connection PV systems, based on the loss factors of double line-frequency voltage ripple, fast irradiance variation, fast dc load variation, non-uniform solar cell characteristic, and limited operating voltage range. These loss factors will result in power deviation from the maximum power points (MPP). In the power loss analysis, both single-stage and...
This paper presents the MPPT (maximum power point tracking) and PCC (point of common coupling) current control strategy for grid-connected PV system using the ZSI (Z-source inverter). Several requirements of an inverter for PV-system and the shoot-through effect of the ZSI are analyzed. And then, the MPPT algorithm and PWM method for the ZSI are suggested. The feasibility is studied through the simulation...
This paper proposes a residential solar power system using Z-source inverter. The Z-source inverter employs a unique impedance network couple with the solar cell and inverter main circuit. The operating principle, control strategy and characteristics of the system are described. The new and traditional system configurations are compared in this paper. Analysis and simulation results are presented...
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