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Nonlinear and unbalanced loads produce power quality pollution to interfaced power systems. Also, photovoltaic systems implementation could worst the situation without proper functioning of active power filters. Now, available active power filters are suffering from to fully suppress interfaced power grid harmonics and distortions under highly unbalanced and nonlinear loads. In this paper, a new approach...
In this designed system for interfacing the Photovoltaic system to grid at it's maximum power point we used single stage topology which consist a current source inverter along with maximum power point tracking system and double tuned resonant filter. In this system small dc link inductor is connected in series with double tuned resonant filter to eliminate harmonics at dc side of inverter, which increase...
This paper proposes a photovoltaic (PV) power generation system, which is implemented by means of multilevel converters. The PV system is connected to utility grid and operates as a unified power quality conditioner (UPQC). Thus, the PV-UPQC system injects active power into the there-phase grid and, simultaneously, performs active power-line filtering, in order to improve the power quality. By using...
The line commutated converter (LCC) is matured technology which is used for power conversion. The LCC is tied to a grid in which commutation of power devices (SCR) is achieved by grid voltage. In this paper, three phase LCC in an inverter mode is proposed for interfacing of solar photovoltaic (PV) array and ac grid. This topology does not require to make and maintain the synchronism between converter...
This work presents the photovoltaic Micro Inverter Systems (MIS) and its control techniques. The Micro Inverter is the combination of a boost-half-bridge DC-DC converter and full bridge pulse width-modulated inverter. The Repetitive Current Controller (RCC) based on fourth-order linear phase IIR filter is used to regulate the current. The boost-half-bridge converters results in minimal number of semiconductor...
The paper analyzes the saturation effects in digital extremum seeking circuits used for MPPT solutions, providing them dynamical reliability and allowing a better fitting of MPPT parameters. The paper reviews the digital extremum seeking control technique, applies it to a photovoltaic panel and establishes the adjusting criteria for a better performance of the MPPT solution. Some simulations and experimental...
The paper presents a large-signal stability analysis of Digital Extremum Seeking Control. This technique consists in adding a small discrete-time sinusoidal signal at the input of the nonlinear system and then processing the output in order to steer the photovoltaic panel to its maximum power point. The stability analysis is based on Lyapunov's direct method and takes into account the saturation that...
In this paper, the modified maximum power point tracking (MPPT) based-on the ripple correlation control technique application for single-phase voltage source inverter (VSI) grid-connected photovoltaic (PV) system is proposed. The algorithm has been developed by using the mean function instead of the 1st order highpass filters (HPFs) and lowpass filters (LPFs) to control the maximum power transferring...
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...
A new analog Maximum Power Point Tracking (MPPT) technique which is particularly suitable for Distributed Maximum Power Point Tracking Applications (DMPPT) is presented and discussed. Its main advantages are simplicity of implementation, absence of memory and multiplication operations, high MPPT efficiency and the intrinsic capability to attenuate the effect, on the PV voltage, of 100/120 Hz disturbances...
A kind of photovoltaic grid-connected device is designed based on FPGA in this paper. The system can achieve maximum power point tracking (MPPT) and the auto-adjustment of frequency and phase in grid-connecting. It consists of auxiliary fly-back switch power, full-bridge DC/AC converter, LC filter and some protecting circuit etc. The device possesses the high speed of MPPT adjustment and tracking...
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