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In this paper, a high gain single-stage buck-boost grid-connected system is proposed. The proposed system consists of a high voltage gain - high efficiency - switched inductor buck-boost converter (SIBBC) and a folded cascade H-bridge inverter. The proposed converter switch is derived with a sinusoidal modulation, so that the converter output voltage is a rectified sine wave which requires only a...
This paper presents a method to minimize the losses and the magnetic cores volume in a single-phase active power filter based in a two stages grid-connected PV system. The proposed circuit injects PV generated power into the utility, and always acts as an active power filter to compensate load harmonics and reactive power such that the input power factor is very high independently of the solar radiation...
This paper presents a three-phase grid-connected photovoltaic generation system with unity power factor for any situation of solar radiation. The modelling of the PWM inverter and a control strategy using dq0 transformation are proposed. The system operates as an active filter capable of compensate harmonic components and reactive power, generated by the loads connected to the system. An input voltage...
Photovoltaic power plants pose some challenges when integrated with the power grid. The PV plants always focus on extracting the maximum power from the arrays. This makes the PV system unavailable for helping in regulating the grid frequency as compared to conventional generators. The objective of this paper is to introduce a pseudo power point tracking which provides frequency regulation functionality...
This paper proposes a control methodology for interfacing medium and large photovoltaic (PV) arrays to the power system distribution grid. First, the structure of the PV system in grid-connected mode is introduced. It consists of a PV array in addition to a power conditioning system for grid interfacing purposes. The power conditioning system is composed of a DC-DC boost converter, followed by a current...
This paper deals with the use of grid-connected photovoltaic (PV) power plants for supplying the ancillary service of reactive power compensation to the distribution grid. A control strategy has been developed for controlling both real and reactive power exchanged with the distribution network. The paper suggests how the real and reactive power references should be selected in order to maximize the...
This paper presents an intelligent fuzzy method for maximum power point tracking (MPPT) of a single grid-connected photovoltaic system. The fuzzy inference system can easily synthesize the algorithm to perform MPPT. The MPPT fuzzy method is improved by weighting the control action by the short-circuit current. Hence, it is proposed an estimator of the short-circuit current based on a Takagi-Sugeno...
A major requirement for grid-connected power converters imposed by codes and standards is “anti-islanding” protection. When the grid connection is lost or otherwise stops functioning, the photovoltaic power converter is required to shut off to avoid “backfeed” into the local distribution network. This paper describes a “reverse PFC” admittance control that controls the output current of an inverter...
Distributed Generation source are widely used because of their remarkable advantages. Photovoltaic (PV) cells which produce DC voltage in their output belong to these sources and should be connected to the network through a power electronic interface. At the other hand, considering PV characteristics show that maximum power can be extracted at the optimal operating point which depends on the solar...
In this work a single-phase active power filter based in a two stages grid-connected photovoltaic system is presented. The proposed system injects PV generated power into the utility, and always acts as an active power filter to compensate load harmonics and reactive power such that the input power factor is unity independently of the solar radiation. In sunny days, the system processes all the reactive...
Photovoltaic systems because of their nature of pollution free and none fuel requirements to produce energy, has considerably become highlighted in recent decade. More over lots of investments will displaced on science instead of paying for Energy. In this paper, considering power quality principals on THD, the fact that output characteristic of PV modules is similar to constant voltage source. The...
Photovoltaic (PV) module produces DC voltage, so it must be connected to the network through an inverter. Considering PV characteristics clear that maximum power is obtained in some specific operating points. These optimal points depend on the solar radiation as well as ambient temperature and vary with their changes. Therefore, DC-DC converter is usually used between PV module and inverter to keep...
This paper presents a three-phase grid-connected photovoltaic generation system with unity power factor for any situation of solar radiation. The model of the PWM inverter and a control strategy using dq0 transformation are proposed. The system operates as an active filter capable of compensate harmonic components and reactive power, generated by the other loads connected to the system. An input voltage...
In this paper a single-phase active power filter based in a two stages grid-connected photovoltaic system with is presented. The proposed system can not only inject PV power into utility but can act always as an active power filter to compensate the load harmonics and reactive power such that the input power factor is unity independently of the solar radiation. In sunny days, the system processes...
The paper presents a comprehensive study on grid-connected photovoltaic (PV) systems, dealing both with control strategy aspects and performance evaluation techniques. In particular, an advanced control scheme to suitably drive the injection of both active and reactive power into a MV radial distribution grid is here discussed, highlighting its main features by means of the numerical simulation of...
This paper proposes a detailed mathematical model and a multi-level control scheme of a three-phase grid-connected photovoltaic (PV) system used as a dispersed generator, including the PV array and the electronic power conditioning (PCS) system, based on the Matlab/Simulink software. The model of the PV array proposed uses theoretical and empirical equations together with data provided by the manufacturer,...
Implementation of ancillary services in photovoltaic systems could facilitate their penetration in power systems. PV converters can be designed to improve grid power quality using power conditioning functionalities. This paper presents a single-phase photovoltaic system which provides grid voltage support at fundamental frequency. The proposed topology is controlled with the droop control technique...
This paper presents a three-phase grid-connected photovoltaic generation system with unity power factor for any situation of solar radiation. The model of the PWM inverter and a control strategy using dq0 transformation are proposed the system operates as an active filter capable of compensate harmonic components and reactive power, generated by the other loads connected to the system. A input voltage...
In this paper, the phenomena that occurs when connecting a PV energized micro-grid to the public grid, is presented. A PV inverter system, for supplying the micro-grid, was designed and simulated using Matlab-Simulink. The simulations are done for three different power factors, showing in this way how the power factor can influence the behavior of the system, especially when the transitory regime...
This paper presents a model of the three-phase PWM inverter and a control strategy using dqO transformation to be employed in a grid connected photovoltaic generation system. The proposed system operates as an active filter capable of compensate harmonic components and reactive power, generated by the other loads connected to the system. To control the power between the grid and photovoltaic system...
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