In this work, the study gives attention for improvement of the Maximum power point Tracking (MppT) using the perturb and observe (p&o) algorithm based MppT applied to solar power generation system (SpGS). The algo...
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The most significant challenge the maximum power point tracking (MppT) algorithms face is reaching the global MppT under partial shading conditions (pSC). In this case, the power-voltage (p-V) and current-voltage (I-V...
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The most significant challenge the maximum power point tracking (MppT) algorithms face is reaching the global MppT under partial shading conditions (pSC). In this case, the power-voltage (p-V) and current-voltage (I-V) characteristic curves of the photovoltaic (pV) system produce many maximum power points, which is the reason that the algorithms often trapped in local maximum power point (LMpp). The perturbation and observation (p&o) algorithm is simple and effective for finding Mppon a mono-extreme graph. Under pSC with many extremes, it is necessary to limit the range of potential GMpp so that this algorithm can avoid the LMpp trap. This paper introduces a global MppT (GMppT) method based on the combination of modified p&o and simulates the behavior of the I-V curve under pSC. In particular, the starting parameters of the algorithm are adjusted in the potential GMpp region to exploit simplicity and efficiency to increase performance and convergence speed. The proposed method determines the area where the GMpp is potentially found more accurately, and this contribution is crucial for increasing the efficiency of the strings of pV arrays under partial shading conditions. By comparing results with other algorithms, such as Modified p&o, Adaptive Jaya (Ajaya), and Jaya, the proposed algorithm has verified its outstanding advantages in MppT performance and search time under the same test conditions.
To maximize power transfer from the pV panel, a perturb and observe (p&o) algorithm and a feedback controller are used to create the Maximum power point Tracking (MppT) algorithm. The dynamic performance of the Mp...
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To maximize power transfer from the pV panel, a perturb and observe (p&o) algorithm and a feedback controller are used to create the Maximum power point Tracking (MppT) algorithm. The dynamic performance of the MppT algorithm depends on the feedback controller's ability to track the pV panel voltage to the reference voltage from the p&o algorithm. This research introduces an adaptive proportional-Integral- Derivative (pID) controller that improves the dynamic characteristics of the MppT algorithm. The proposed adaptive control technique utilizes a pID controller and the exponential forgetting recursive least squares (EFRLS) algorithm to update the pID gains online. The verification process involves simulations under three scenarios: slow and fast variations in temperature, solar insolation, resistive load, and partial shading situations. The proposed adaptive pID controller performs robustly during tracking pV panel voltage under different atmospheric conditions.
Inverters play a significant role in the configuration of grid-connected photovoltaic(pV)*** perturb-and-observe(p&o)algorithm is a common method to derive the maximum power from grid-connected inverters;however,t...
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Inverters play a significant role in the configuration of grid-connected photovoltaic(pV)*** perturb-and-observe(p&o)algorithm is a common method to derive the maximum power from grid-connected inverters;however,the possibility of losing maximum power due to sudden changes in radiation is a significant drawback of this control *** overcome this barrier,the two-stage multi-string inverter using the ZETA DC-DC converter and a novel p&o algorithm has been proposed to increase the efficiency of these *** proposed inverter has been simulated in MATLAB/SIMULINK *** investigate the performance of the proposed inverter,technical,environmental and economic feasibility studies have been performed for the construction of a 5-kW pV power plant in a northern city of Iran(Sari)using the RETScreen software developed by Natural Resources *** the other hand,most feasibility studies for power-plant construction are based on the concept of inverter peak efficiency,which leads to non-optimal system design due to the short operation duration of the inverter at this ***,the weighted European efficiency has been used in the feasibility study for more accurate ***,the performance of the proposed inverter is compared to that of a two-stage multi-string inverter using a conventional p&o algorithm and the single-stage(central)*** simulation results indicated that the proposed inverter injects 7.6 MW of power into the grid per ***,it prevents the emission of 88 tons of Co_(2)(over 20 years),which is equivalent to saving 1883.5 litres of gasoline per year.
This paper represents an electrical modeling of a photovoltaic water pumping system composed of photovoltaic panels. The system reassures electrical energy generation applying a DC buck converter in order to supply a ...
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This paper represents an electrical modeling of a photovoltaic water pumping system composed of photovoltaic panels. The system reassures electrical energy generation applying a DC buck converter in order to supply a DC motor topump water. Known for its optimal electrical and physical properties, the super capacitor is integrated into the pV pumping system to allow storing electrical energy and powering the pumping motor at nights and cloudy days. The implementation of the perturbation and observation algorithm in the DC buck converter reassures the system's operation around the maximum power point produced by the photovoltaic panel. Moving from quantity problem to quality problem, several internal and external factors can infect the stability of the pV pumping system and disrupt its operation around nominal point. on account of this, a pole placement technique is proposed in this paper. This technique is advocated not only for its simple processing and rapid execution, but also for being based on the conversion of the electrical model of the pV pumping system into a mathematical model that comprises matrix equations. This energy conversion process allows variations in output values in proportion to the input evolution along with positioning the system's poles in the stable points of the S-plane. The equation of this technique applied to the photovoltaic pumping system is indicated in this paper having its program created in Matlab and installed in pLC S7-200 on account of its ability to monitor the inputs instantaneously and modify the outputs in a way proportional to the installed program. Subsequently, the validation of the robustness of this technique is reassured by the comparison between the simulation in Matlab and the experimental tests carried out in sunny periods having the engine powered by photovoltaic panels, and shaded periods where power supply is reassured by the super capacitor.
A proposal of Maximum_peak power_Tracker (Mpp1) controller for photo-voltaic (po satellite using partially modified perturb-and-observe (p&o) technique and FpGA implementation is executed and introduced An enhance...
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ISBN:
(纸本)9781538651117
A proposal of Maximum_peak power_Tracker (Mpp1) controller for photo-voltaic (po satellite using partially modified perturb-and-observe (p&o) technique and FpGA implementation is executed and introduced An enhanced high frequency variable-step-size 1)&0 algorithm is accomplished with filly well programed using a hardware description language (VHDL). Thereafter, an amended MppT algorithm is implemented on "Spartan-3A/3AN FpGA Starter Kit" FpGA. Simulation and Experimental results are executed and exhibited that the proposed algorithmovercome the disadvantages of the conventional algorithm that can he summarized into tracking speed, reduction of output power oscillation in steady state operation and significant deviation of voltage and power due to sudden change in solar insolation.
Under uniform operating conditions, the power-voltage (p-V) and current-voltage (I-V) curves of a photovoltaic (pV) system have only one maximum point, which facilitates the operation of maximum power point tracking (...
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Under uniform operating conditions, the power-voltage (p-V) and current-voltage (I-V) curves of a photovoltaic (pV) system have only one maximum point, which facilitates the operation of maximum power point tracking (MppT) algorithms. In practice, the pV systems often operate under heterogeneous environments due topartial shading conditions (pSCs). The p-V and I-V curves exhibit multiple extremes, and distinguishing between the global maximum power point (GMpp) and local maximum power point (LMpp) is a major challenge for algorithms aiming to improve performance and convergence speed. This paper presents a global maximum power point tracking (GMppT) method based on simulating the behavior of the I-V curve of a pV system under the influence of pSCs. With only one initial parameter selected, the proposed solution quickly determines the LMpps based on the characteristics of the pV type and the shading condition during operation. This work helps to limit the potential GMpp region to reduce the search time and improve efficiency by using a simple algorithm and a small tuning step size. The experimental results demonstrate that the proposed method provides superior MppT performance and significantly reduces search time due to improved GMpp detection accuracy combined with small step sizes.
This paper presents three variable step size p&oalgorithms for optimizing the separation efficiency of a coalescing pump/deoiling hydrocyclone produced water treatment system. By continuously adjusting the pumpin...
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This paper presents three variable step size p&o algorithms for optimizing the separation efficiency of a coalescing pump/deoiling hydrocyclone produced water treatment system. By continuously adjusting the pumping pressure, and subsequently the coalescing effect, the algorithms are used to minimize the oil concentration downstream the hydrocyclone. Due to the variable step size, the algorithms react rapidly to changes in the upstream produced water characteristics, at the same time as they reduce (or eliminate) steady-state oscillations. Based on both simulation and experimental testing, the study discusses advantages and disadvantages of the algorithms.
In this paper, a new maximum power point tracking (MppT) system for photovoltaic applications is presented. The proposed system consists of two analog loops, a current and a voltage loop, built around a boost converte...
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In this paper, a new maximum power point tracking (MppT) system for photovoltaic applications is presented. The proposed system consists of two analog loops, a current and a voltage loop, built around a boost converter and a digital loop for the computation of the maximum power point. The analog loops provide a fast response to sudden changes of irradiance conditions while the digital loop, enhancing the accuracy, allows the implementation of various MppT algorithms and facilitates the integration of additional control and monitoring features. Different existing systems are simulated and compared. A small signal model for the proposed system is developed and a novel compensation method is found. The compensation is designed in such a way that it makes the system independent of the input panel used and alsoof the load connected at the output. In order to have fast simulation results, a macromodel is developed allowing comparison between different algorithms. Furthermore the "perturb and observe" (p&o) algorithm is improved toobtain a better response for changing irradiance conditions. (C) 2011 Elsevier Ltd. All rights reserved.
In this paper an FpGA-based implementation of a real time perturb and observe (p&o) algorithm for tracking the Maximum power point (Mpp) of a photovoltaic (pV) generator is presented. The p&oalgorithm has bee...
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In this paper an FpGA-based implementation of a real time perturb and observe (p&o) algorithm for tracking the Maximum power point (Mpp) of a photovoltaic (pV) generator is presented. The p&o algorithm has been designed using the very high-speed description language (VHDL) and implemented on Xilinx Virtex-II-pro(xc2v1000-4fg456) - Field programmable Gate Array (FpGA). The algorithm and the hardware have been simulated and tested by conditioning the power produced by the pV-modules installed on the rooftopof the "Hall of Technology Laboratory" at Jijel University. The main advantages of the developed MppT are low cost, good velocity, acceptable reliability, and easy implementation. However, its main disadvantage is related to the fact that for fast changes in irradiance it may fail to track the maximum power point. The efficiency of the implemented p&o controller is about 96%. (C) 2010 Elsevier Ltd. All rights reserved.
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