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A hybrid intelligent GMPPT algorithm for partial shading PV system
摘要： Maximum power extraction for PV systems under partial shading conditions (PSCs) relies on the optimal global maximum power point tracking (GMPPT) method used. This paper proposes a novel maximum power point tracking (MPPT) control method for PV system with reduced steady-state oscillation based on improved particle swarm optimization (PSO) algorithm and variable step perturb and observe (P&O) method. Firstly, the grouping idea of shuffled frog leaping algorithm (SFLA) is introduced in the basic PSO algorithm (PSO–SFLA), ensuring the differences among particles and the searching of global extremum. Furthermore, adaptive speed factor is introduced into the improved PSO to improve the convergence of the PSO–SFLA under PSCs. And then, the variable step P&O (VSP&O) method is used to track the maximum power point (MPP) accurately with the change of environment. Finally, the superiority of the proposed method over the conventional P&O method and the standard PSO method in terms of tracking speed and steady-state oscillations is highlighted by simulation results under fast variable PSCs.
关键词： Variable step P&O (VSP&O),Global maximum power point tracking (GMPPT),Under partial shading conditions (PSCs),Particle swarm optimization (PSO),Photovoltaic (PV) system,Adaptive speed factor,Shuffled frog leaping algorithm (SFLA)
更新于2025-09-10 09:29:36
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[IEEE 2018 International Conference on Smart Electric Drives and Power System (ICSEDPS) - Maharashtra State, India (2018.6.12-2018.6.13)] 2018 International Conference on Smart Electric Drives and Power System (ICSEDPS) - Grid connected PV system using FB-PSO
摘要： This Paper presents a MPPT (maximum power point tracking) design for a Grid connected PV (Photo-voltaic) system using FB-PSO (Forward Backward particle swarm optimization) Technique. The FB-PSO is a new improved method which results in maximum efficiency, fast tracking of maximum power point, less steady state oscillations compare to PO (Perturb and Observe) and CPSO (Conventional PSO) methods. The proposed scheme is examine under PSC (partial shading conditions) and its results are compare with other two methods. The FB-PSO algorithm is implemented in MATLAB/SIMULINK and it is observed that proposed method is best compare to PO and CPSO MPPTs.
关键词： Forward Backward particle swarm optimization (FB-PSO),Maximum point tracking (MPPT),Conventional particle swarm optimization (CPSO),Perturb and Observe (PO),Photo-voltaic (PV),partial shading conditions (PSC)
更新于2025-09-10 09:29:36
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Combined Tracking of the Maximum Power and Maximum Efficiency Operating Points for Real-Time Maximization of the Energy Production of PV Systems
摘要： The power production of a PV system can be maximized by applying a global MPPT method for ensuring that the PV array operates at the global MPP where its power production is maximized and, simultaneously, by dynamically maximizing the efficiency of the power converter that interfaces the PV-generated energy to the energy storage devices or the electric grid. In this paper, a new control method has been presented for the real-time maximization of the power production of PV systems by modifying in real-time the duty cycle and switching frequency of the power converter PWM control signal. The proposed method has the advantage that it can be applied in PV systems operating under partial shading conditions. Also, knowledge of either the operational characteristics and configuration of the PV modules within the PV array, or the power converter operational characteristics, is not required for its application. The experimental results validated that, by using the proposed method, the power production of the PV system is increased significantly compared to the case that only the power production of the PV array is maximized by using a global MPPT technique without tracking the optimal value of the power converter efficiency.
关键词： Power Converter Efficiency,Optimization,Partial shading,Photovoltaic systems,Maximum Power Point Tracking
更新于2025-09-09 09:28:46
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Increasing Energy Capture from Partially Shaded PV String Using Differential Power Processing
摘要： In PV strings based on series-connected PV modules, mismatches among the modules due to partial shading, will cause in power loss either due to series connection constraint or due to bypass diodes. This paper proposes a new distributed MPPT (DMPPT) scheme using multi-winding forward-based converter, acts as a current balancing differential power processing (DPP) converter. The converter is configured in the way that each converter port is connected in parallel with individual PV module to enable module-level maximum power extraction. The proposed architecture operates in two modes: local MPPT mode and current balancing mode. The new MPPs at module-level are tracked in local MPPT mode and then dispatched to start current balancing mode of operation. In the current balancing mode, this paper proposes a simple control approach to maximize output power from partially shaded PV string by maintaining an effective MPPT at module-levels and directly transferring the compensation currents toward the shaded modules from modules under normal conditions without any intermediary. The proposed DMPPT scheme is validated by simulation and experimental results. The results show that using the proposed scheme, the system efficiency is significantly improved compared to other existing topologies.
关键词： distributed maximum power point tracking (DMPPT),partial shading (PS),photovoltaic (PV),differential power processing (DPP)
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Kota Kinabalu, Malaysia (2018.10.7-2018.10.10)] 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Mitigating the effect of partial shading by triple-tied configuration of PV modules
摘要： Partial shading is the phenomenon, which occurs when PV modules receive irregular irradiance on a PV array. Due to that, shaded PV modules are bypassed by diodes and significant reduction in power is experienced. To counter such problem, PV modules are connected in different configuration to provide alternative path for current to flow, so that the effect of partial shading is lessened and power attainment is improved. A comprehensive literature review suggests that several PV configurations are proposed namely simple-series (SS), parallel (P), series-parallel (SP), total-cross-tied (TCT), bridge-linked (BL) and honey-comb (HC). In this paper, a comprehensive review is presented to highlight the benefits and limitations of each scheme. To mitigate the limitation of other approaches, a new configuration named triple-tied (TT) is proposed. Several experiments are carried out using both MATLAB Simulink and hardware implementation to validate the performance of proposed configuration. Eleven different partial shading cases are used to analyze the output characteristics. Based on the results, the proposed TT configuration outperforms other PV configurations except TCT. However, in TT wiring connections are significantly reduced compared to TCT which makes it favorable in many large-scale PV applications.
关键词： PV Configuration,Maximum Power,Partial Shading,Solar,PV,Irradiance Mismatch
更新于2025-09-04 15:30:14
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Hybrid global maximum power point tracking algorithm under partial shading condition
摘要： This paper presents a hybrid global maximum power point tracking (MPPT) algorithm under partial shading conditions, which consists of five methods, including the global scanning method, the filtering method, the binary searching method, the three-point method, and the anti-restarting method. By making full use of the advantages of these methods, the proposed algorithm is able to improve tracking speed and efficiency, decrease oscillation, and avoid restarting. Among which, the global scanning method is used to find all the local intervals, the filtering method is used to reduce the search area, the binary searching method is used to reduce the search time, the three-point method is used to track the global maximum power point dynamically, and the anti-restarting method is used to prevent restarting the algorithm. To verify the proposed algorithm, experiments have been carried out in a standard environment, dynamic solar irradiation, and dynamic temperature, respectively. The performance of the proposed algorithm is verified by comparing it with a perturb and observe (P&O) based global scanning MPPT method and a modified P&O with checking MPPT method using computer simulations.
关键词： MPPT,global maximum power point tracking,photovoltaic systems,partial shading condition,hybrid algorithm,solar energy
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on 3D Vision (3DV) - Verona (2018.9.5-2018.9.8)] 2018 International Conference on 3D Vision (3DV) - Learning to Reconstruct Texture-Less Deformable Surfaces from a Single View
摘要： Recent years have seen the development of mature solutions for reconstructing deformable surfaces from a single image, provided that they are relatively well-textured. By contrast, recovering the 3D shape of texture-less surfaces remains an open problem, and essentially relates to Shape-from-Shading. In this paper, we introduce a data-driven approach to this problem. We introduce a general framework that can predict diverse 3D representations, such as meshes, normals, and depth maps. Our experiments show that meshes are ill-suited to handle texture-less 3D reconstruction in our context. Furthermore, we demonstrate that our approach generalizes well to unseen objects, and that it yields higher-quality reconstructions than a state-of-the-art SfS technique, particularly in terms of normal estimates. Our reconstructions accurately model the fine details of the surfaces, such as the creases of a T-Shirt worn by a person.
关键词： deformable surfaces,data-driven approach,Shape-from-Shading,texture-less surfaces,3D reconstruction
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Students' Conference on Electrical, Electronics and Computer Science (SCEECS) - Bhopal, India (2018.2.24-2018.2.25)] 2018 IEEE International Students' Conference on Electrical, Electronics and Computer Science (SCEECS) - Improving the output power of Solar PV Array under different irradiation conditions
摘要： The factors that influence the output power of Solar Photo-Voltaic (SPV) Array are temperature of the Photo Voltaic cell, solar insolation and shading pattern. Partial shading is the main disadvantage that occurs while reducing the output power of the SPV Energy. To counter this disadvantage, a new reconfiguration technique Tom-Tom configuration is used to reconfigure the Solar Photo-Voltaic (SPV) Array to enhance the output power under partial shaded conditions. The theoretical and MATLAB/Simulink results give the ‘PV’ characteristics for the conventional and proposed techniques. From the results, it can be inferred that more output power is provided by Tom-Tom configuration than the conventional Total Cross Tied (TCT) pattern and the multiple peaks are minimized. Shade dispersion concept is presented by Tom-Tom, using which the concentrated shaded is diluted. The various shading patterns those are available in the literature are used to verify the performance of the proposed system. Results reaffirm that the output power is increased if the shaded panels are relocated.
关键词： Partial Shading,Solar PV Array,Tom-Tom Configuration
更新于2025-09-04 15:30:14