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Simplified circuit model of novel bypass diode based pv array for circulating current and power loss minimization under partial shading

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COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING 2025年第1期44卷 1-18页

作者： Santra, Subhendu Bikash Mohanty, Subodh Kumar Choudhury, Tanmoy Roy Shiv Nadar Inst Eminence Dept Elect Engn Noida India KIIT Univ Sch Elect Engn Bhubaneswar India Natl Inst Technol Rourkela Dept Elect Engn Rourkela India

PurposeThis study aims to propose a new connection technique of bypass diode (BD) in photovoltaic (pv) array, which reduces the circulating current (CC) within pv modules as well as conduction loss in partial shaded condition (PSC).Design/methodology/approachLinearized circuit model of pv panel is proposed for calculating the CC and power loss of novel BD arrangements in pv array. From the analysis the best BD arrangement is applied in series parallel, TCT and honeycomb (HC) pv array structure for simulation and hardware verification. The hardware verification is performed in a 3 x 3 pv array, where individual panel capacity is 200 *** proposed BD arrangement reduces the power loss due to CC under PSC by almost 3% compared to conventional BD structure in a pv ***/valueThe proposed BD arrangement is simple and useful in large pv power plants to reduce the CC-based extra power loss under PSC.

关键词： pv array Bypass diode Circulating current

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pv array Reconfiguration Based on the Shaded Cells'Number for pv Modules

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CSEE Journal of Power and Energy Systems 2023年第2期9卷 733-742页

作者： Jun Qi Xun Huang Beijia Ye Dan Zhou College of Information Engineering Zhejiang University of TechnologyHangzhou 310014China

Reconfiguration can increase the output power for a pv array under partial ***,traditional reconfiguration methods consider the pv module as either totally shaded or totally unshaded,and module-based simulation is employed to evaluate the reconfiguration ***,there is an unneglectable error when treating a partially shaded pv module as totally shaded,through using a more accurate cellbased *** on the analysis of the determinant factors on MPPs’power of a pv array,a new reconfiguration method is proposed based on the exact partial shadow shape projected on the pv *** method restructures the electrical connection among pv modules of a pv array according to the shaded cells’number(SCN)of every pv *** cell-based simulations are carried out on a pv array to verify the effectiveness of the proposed SCN-based reconfiguration *** comparisons among various reconfiguration methods and shadow distributions clearly show its suitability to different irregular shadows and its superiority in pv output power enhancement.

关键词： Maximum power point(MPP) partial shadow pv array pv module reconfiguration

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Improved power quality converter for three-phase grid-interfaced pv array fed reduced current sensor-based induction motor drive for water pumping

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INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS 2020年第4期30卷 1-20页

作者： Shukla, Saurabh Singh, Bhim Indian Inst Technol Delhi Dept Elect Engn New Delhi India

This paper presents a photovoltaic (pv)-grid integrated system feeding an induction motor-driven water pumping system. The power transfer is controlled by regulating the direct current (DC) link voltage. This system is used for feeding the induction motor-driven water pump primarily and feeding the utility if the water pumping is not required. The power flow is controlled by a power factor-corrected Vienna rectifier. The reduction in sensors makes the system cost-effective. In addition, a flux estimation technique is proposed, which has good DC offset removal capability. The modified space vector modulation (SVM) technique is used for even-harmonics elimination in grid voltage. Simulated results are validated by test results obtained on a developed prototype under different environmental conditions.

关键词： artificial neural network (ANN) current estimation flux estimation technique induction motor (IM) power factor-corrected (PFC) Vienna rectifier pv array third-order integral water pumping

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Improved Global Maximum Power Point Tracking Method Based on Voltage Interval for pv array under Partially Shaded Conditions

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JOURNAL OF POWER ELECTRONICS 2014年第4期14卷 722-732页

作者： Ding, Kun Wang, Xiang Zhai, Quan-Xin Xu, Jun-Wei Zhang, Jing-Wei Liu, Hai-Hao Hohai Univ Coll Mech & Elect Engn Nanjing Jiangsu Peoples R China

The power voltage (P-V) curve of photovoltaic (pv) arrays connected in parallel to bypass diodes would have several local maximum power points (LMPP) under partial shading conditions (PSC). Conventional maximum power point tracking (MPPT) methods fail to search for the global maximum power point (MPP) because the searched peak point may remain at the LMPP on the P V curve under PSC. This study proposes an improved MPPT algorithm to ensure that pv arrays operate at global maximum power point (GMPP) under PSC. The proposed algorithm is based on a critical study and a series of observations of pv characteristics under PSC. Results show the regularity of voltage interval between LMPPs. The algorithm has the advantages of rapidly reaching GMPP, maintaining stability, and recovering GMPP quickly when the operating condition changes. Simulation and experimental results demonstrate the feasibility of the proposed algorithm.

关键词： Global maximum power point tracking (GMPPT) Partially shaded conditions (PSC) pv array P-V curve Voltage interval

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Fuzzy logic control for a grid-connected pv array through Z-source-inverter using maximum constant boost control method

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AIN SHAMS ENGINEERING JOURNAL 2018年第4期9卷 2931-2941页

作者： Mosalam, Hanan A. Amer, Ragab A. Morsy, G. A. Mansoura Higher Inst Engn & Technol Dept Elect Engn Mansoura Egypt Minoufiya Univ Fac Engn Dept Elect Engn Shibin Al Kawm Egypt

The paper presents an alternative scheme using fuzzy logic methodology to control a grid-connected photovoltaic system through ZSI using MCBC method. The system model and control are implemented using MATLAB-SIMULINK simulation toolbox. In view of control, Fuzzy Logic Controllers (FLCs) are designed to enhance the system stability. To ensure a unity power factor operation, the inverter modulation index is controlled to manage the phase current of the grid. Also, the control in the shoot-through ratio controls the output voltage of the pv array, so the maximum power (MP) is extracted. The simulation results using FLCs are compared with others obtained using Proportional Integral (PI) controllers. This is under the same normal operating and transient conditions which are irradiation variation, three-phase short circuit fault at point of connection and voltage variation of the grid. The simulation results of FLCs achieve supplementary enhancement of the system stability over various operating conditions. (C) 2018 Ain Shams University.

关键词： pv array MP Shoot-through ZSI MCBC FLC

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Maximum power point tracking technique using artificial bee colony and hill climbing algorithms during mismatch insolation conditions on pv array

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IET RENEWABLE POWER GENERATION 2018年第16期12卷 1915-1922页

作者： Goud, J. Saikrishna Kalpana, R. Singh, Bhim Kumar, Shailendra Natl Inst Technol Dept Elect & Elect Engn Mangalore Karnataka India Indian Inst Technol Elect Engn Dept Delhi India

This study presents a single current sensor based hybrid maximum power point tracking method to track the global maximum power point (GMPP) of the photovoltaic (pv) array during the mismatch insolation conditions. This method combines the artificial bee colony (ABC) and hill climbing (HC) algorithms to track the GMPP of a pv array. The proposed method uses the HC algorithm to identify the occurrence of mismatch insolation conditions on pv array. During the mismatch insolation conditions, the proposed method scans the battery charging current (I-charge) versus duty cycle (D) characteristics of the power electronic interface circuit to classify the type of shading pattern of P-V curve and also to identify the vicinity of the GMPP. Based on the kind of shading pattern of a P-V curve, the proposed method operates either ABC or HC algorithm to track the GMPP. To improve the convergence speed of the proposed method, the search space of the ABC algorithm is reduced. The proposed method is modelled and simulated in MATLAB software and its performance is validated experimentally for various mismatch insolation conditions.

关键词： maximum power point trackers photovoltaic power systems artificial bee colony algorithm search problems convergence power electronics maximum power point tracking technique artificial bee colony algorithm ABC algorithm hill climbing algorithm HC algorithm mismatch insolation conditions pv array single current sensor based hybrid maximum power point tracking method global maximum power point GMPP photovoltaic array battery charging current duty cycle characteristics power electronic interface circuit shading pattern P-V curve convergence speed search space MATLAB software

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A Generalized Henon Map-Based Solar pv array Reconfiguration Technique for Power Augmentation and Mismatch Mitigation

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IETE JOURNAL OF RESEARCH 2023年第11期69卷 8404-8422页

作者： Amar Raj, Rayappa David Anil Naik, Kanasottu Natl Inst Technol Dept Elect Engn Warangal 506004 Telangana India

The conventional pv array configurations fail to eliminate the ill effects of partial shading (PS) thereby resulting in mismatch losses. pv array reconfiguration is considered as the most competent solution for shading-related issues. However, many reconfiguration techniques reported in the literature fail to disperse the shade effectively, not compatible with large-scale arrays, and are not generalized for all array sizes. To overcome these limitations, a highly efficient generalized Henon Map technique which is extensively used in the image encryption process is proposed in this paper to reconfigure the pv array. The proposed technique is extensively analyzed for 9 x 9, 8 x 8, 4 x 4, 3 x 5 and 4 x 3 pv arrays under distinct shading patterns with seven parameters. The obtained results are compared with conventional Series-Parallel, Total-Cross-Tied, and very recently reported Odd-Even, Odd-Even-Prime, Chaotic Baker's Map, Magic square, and Diagonal-TCT reconfiguration techniques. Besides, an experimental prototype model is developed and tested under artificially shading conditions to validate the competence of the proposed configuration. From the comprehensive analysis, it is noted that the proposed technique offers consistently superior performance with the least percentage mismatch and maximum power enhancement of 24.17%, 25.65%, and 47.81% for various shading cases of 9 x 9, 8 x 8, and 4 x 4 pv arrays, respectively. Further, a qualitative comparative assessment of the proposed technique with other state-of-art techniques is presented.

关键词： Henon map Mismatch Partial shading pv array Reconfiguration Shade dispersal

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Control of grid converters for pv array excited wind-driven induction generators with unbalanced and nonlinear loads

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2014年第Jul.期59卷 188-203页

作者： Sivakumar, P. Arutchelvi, M. JJ Coll Engn & Technol Dept Elect & Elect Engn Tiruchirappalli Tamil Nadu India Saranathan Coll Engn Dept Elect & Elect Engn Tiruchirappalli 620012 Tamil Nadu India

In this paper, a new control algorithm for grid connected inverter fed by Photovoltaic array (pv) excited wind-driven induction generator (IG) for unbalanced nonlinear load at point of common coupling (PCC) is proposed. The proposed composite power controller comprises of multi control loops such as power, voltage and current loops. The power control loop generates positive sequence reference current based on the availability of pv power and the average power demand of the load and negative sequence reference currents to compensate the oscillating power component that appears due to the unbalanced nonlinear load at the PCC and further, drop due to non-fundamental power component is compensated by addition of virtual non-linear impedance to the current control loop. The voltage control loop generates the reactive current reference to compensate the drop due to nonlinear magnetizing reactance of IG to eliminate the machine de-rating effect. The current control loop regulates the average and suppresses the oscillating power in dual decoupled double synchronous reference frame to generate modulating signal to the pv sourced inverter. Exhaustive simulations are carried out for the proposed scheme for varying irradiations, wind speed and load variations at the PCC in MATLAB and compared with direct power control scheme. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Voltage oriented control Direct power control Composite power control wind-driven induction generator Deration factor pv array

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A Current Supported pv array Reconfiguration Technique to Mitigate Partial Shading

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IEEE TRANSACTIONS ON SUSTAINABLE ENERGY 2021年第2期12卷 1449-1460页

作者： Karmakar, Binoy Kumar Karmakar, Gopinath Univ Calcutta Dept Appl Phys Kolkata 700009 W Bengal India Bhabha Atom Res Ctr Reactor Control Div Mumbai 400094 Maharashtra India

Partial shading in a solar pv plant is an important concern as it reduces the output power. Dynamic array reconfiguration (DAR) helps in reducing the impact of partial shading. But, it has its own limitations. Further, DAR does not guarantee single peak in array power-voltage characteristics during partial shading. It requires sophisticated and costly MPPT controller to track the global peak in order to extract maximum power from the pv array. In this paper, an improved DAR strategy is proposed using current injection (CI). This CI-based DAR strategy enhances the array power output beyond what is achievable by the available DAR techniques. Using this technique, multiple peaks in the power-voltage characteristics of the pv array are also avoided. The proposed method is evaluated for different levels of shading and its patterns. Experimental results establish the superiority of the CI-based DAR method over the available pv array reconfiguration strategies.

关键词： Maximum power point trackers Optimization Tracking Sensor arrays Particle swarm optimization Matrix converters Investment CI-DAR DAR pv array partial shading

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Mathematical modelling of pv array under partial shading condition

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SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES 2022年第2期47卷 1-9页

作者： Jha, Vandana CV Raman Global Univ Dept Elect Engn Bhubaneswar 752054 India

This paper proposes mathematical modelling of photovoltaic (pv) array under partial shading condition. The proposed mathematical modelling is capable of predicting the output characteristics of pv array of any dimension, made of any kind of pv modules, having any number of bypass diodes, and for any shading pattern (irradiance and temperature) by utilizing only the values of the parameters of pv module provided in the manufacturer's datasheets. Although the proposed modelling can be implemented by any software tool, in this paper, it has been implemented using MATLAB programming. The proposed modelling has been validated on two pv arrays ((i) pv array made of four WS-330 pv modules configured in SP configuration and (ii) pv array made of four HSTBF24265P pv modules configured in TCT configuration) for in total of five test cases to establish its robustness. The test cases cover situations ranging from the most probable to least probable shading scenarios. The results generated by MATLAB programming of the proposed equations of pv array under uniform irradiance condition and partial shading condition have been validated by the results obtained by MATLAB simulation. The proposed modelling has also been experimentally validated on the aforementioned pv arrays.

关键词： pv module pv array modelling partial shading condition bypass diodes MATLAB

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