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Improved sliding-mode control for tracking global maximum power of triple-series-parallel ladder photovoltaic arrays under uneven shadowing

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Clean Energy 2024年第5期8卷 54-72页

作者： Rama Koteswara Rao Alla Kandipati Rajani Ravindranath Tagore Yadlapalli eee department RVR&JC College of EngineeringGunturAndhra Pradesh-522019India eee department Vignan’s Lara Institute of Technology&ScienceGunturAndhra Pradesh-522213India

This paper presents an innovative way to enhance the performance of photovoltaic(PV)arrays under uneven shadowing *** study focuses on a triple-series–parallel ladder configuration to exploit the benefits of increased power generation while ad-dressing the challenges associated with uneven *** proposed methodology focuses on the implementation of improved sliding-mode control technique for efficient global maximum power point ***-mode control is known for its robustness in the presence of uncertainties and disturbances,making it suitable for dynamic and complex systems such as PV *** work employs a comprehensive simulation framework to comment on the performance of the suggested improved sliding-mode control strategy in uneven shadowing *** analysis has been done to show the better effectiveness of the suggested method than the traditional control *** results demonstrate a remarkable enhancement in the tracking accuracy of the global maximum power point,leading to enhanced energy-harvesting capabilities under challenging environmental ***,the proposed approach exhibits robustness and adaptability in mitigating the effect of shading on the PV array,thereby increasing overall system *** research contributes valuable insights into the development of advanced control strategies for PV arrays,particularly in the context of triple-series–parallel ladder configurations operating under uneven shadowing *** short narrow shading conditions,the improved sliding-mode control method tracks the maximum power better compared with perturb&observe at 20.68%,incremental-conductance at 68.78%,fuzzy incremental-conductance at 19.8%,and constant-velocity sliding-mode control at 1.25%.The improved sliding-mode control method has 60%less chattering than constant-velocity sliding-mode control under shading conditions.

关键词： improved sliding-mode control PV array global maximum power point series-parallel boost converter

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Federated Learning on Internet of Things:Extensive and Systematic Review

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Computers, Materials & Continua 2024年第5期79卷 1795-1834页

作者： Meenakshi Aggarwal Vikas Khullar Sunita Rani Thomas AndréProla Shyama Barna Bhattacharjee Sarowar Morshed Shawon Nitin Goyal Chitkara University Institute of Engineering and Technology Chitkara UniversityRajpuraPunjab140401India department of CSE&IT BPS Mahila VishwavidyalayaKhanpur KalanSonipatHaryana131305India Engineering Research&Innovation Group Universidad Europea del AtlánticoC/Isabel Torres 21Santander39011Spain department of Project Management Universidad Internacional IberoamericanaAreciboPR00613USA department of Project Management Universidade Internacional do CuanzaEstrada Nacional 250Bairro KaluapandaCuito-BiéAngola department of Computer Science and Engineering University of Science and Technology Chittagong(USTC)Chattogram4202Bangladesh Deptartment of eee University of Science and Technology Chittagong(USTC)Chattogram4202Bangladesh department of Computer Science and Engineering School of Engineering and TechnologyCentral University of HaryanaMahendragarhHaryana123031India

The proliferation of IoT devices requires innovative approaches to gaining insights while preserving privacy and resources amid unprecedented data ***,FL development for IoT is still in its infancy and needs to be explored in various areas to understand the key challenges for deployment in real-world *** paper systematically reviewed the available literature using the PRISMA guiding *** study aims to provide a detailed overview of the increasing use of FL in IoT networks,including the architecture and challenges.A systematic review approach is used to collect,categorize and analyze FL-IoT-based *** was performed in the Ieee,Elsevier,Arxiv,ACM,and WOS databases and 92 articles were finally *** measures were published in English and with the keywords“FL”and“IoT”.The methodology begins with an overview of recent advances in FL and the IoT,followed by a discussion of how these two technologies can be *** be more specific,we examine and evaluate the capabilities of FL by talking about communication protocols,frameworks and *** then present a comprehensive analysis of the use of FL in a number of key IoT applications,including smart healthcare,smart transportation,smart cities,smart industry,smart finance,and smart *** key findings from this analysis of FL IoT services and applications are also ***,we performed a comparative analysis with FL IID(independent and identical data)and non-ID,traditional centralized deep learning(DL)*** concluded that FL has better performance,especially in terms of privacy protection and resource *** is excellent for preserving privacy becausemodel training takes place on individual devices or edge nodes,eliminating the need for centralized data aggregation,which poses significant privacy *** facilitate development in this rapidly evolving field,the insights presented are intended to help practitioners and re

关键词： Internet of Things federated learning PRISMA framework of FL applications of FL data privacy communication

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RSPSSL:A novel high-fidelity Raman spectral preprocessing scheme to enhance biomedical applications and chemical resolution visualization

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Light(Science & Applications) 2024年第2期13卷 366-386页

作者： Jiaqi Hu Gina Jinna Chen Chenlong Xue Pei Liang Yanqun Xiang Chuanlun Zhang Xiaokeng Chi Guoying Liu Yanfang Ye Dongyu Cui De Zhang Xiaojun yu Hong Dang Wen Zhang Junfan Chen Quan Tang Penglai Guo Ho-Pui Ho Yuchao Li Longqing Cong Perry Ping Shum State Key Laboratory of Optical Fiber and Cable Manufacture Technology Guangdong Key Laboratory of Integrated Optoelectronics IntellisenseDepartment of EEESouthern University of Science and TechnologyShenzhen 518055China College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China department of Nasopharyngeal Carcinoma Sun Yat-sen University Cancer CenterState Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineGuangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and TherapyGuangzhou 510060China department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen 518055China department of Nephrology Chaozhou People’s HospitalChaozhou 521011China Clinical Research Design Division Sun Yatsen Memorial HospitalGuangzhouGuangdong 510120China School of Automation Northwestern Polytechnical UniversityXi’anShaanxi 710072China department of Biomedical Engineering The Chinese University of Hong KongHong KongChina Guangdong Provincial Key Laboratory of Nanophotonic Manipulation Institute of NanophotonicsJinan UniversityGuangzhou 511443China

Raman spectroscopy has tremendous potential for material analysis with its molecular fingerprinting capability in many branches of science and *** is also an emerging omics technique for metabolic profiling to shape precision ***,precisely attributing vibration peaks coupled with specific environmental,instrumental,and specimen noise is *** Raman spectral preprocessing to remove statistical bias noise and sample-related errors should provide a powerful tool for valuable information ***,we propose a novel Raman spectral preprocessing scheme based on self-supervised learning(RSPSSL)with high capacity and spectral *** can preprocess arbitrary Raman spectra without further training at a speed of~1900 spectra per second without human *** experimental data preprocessing trial demonstrated its excellent capacity and signal fidelity with an 88%reduction in root mean square error and a 60%reduction in infinite norm(L__(∞))compared to established *** this advantage,it remarkably enhanced various biomedical applications with a 400%accuracy elevation(ΔAUC)in cancer diagnosis,an average 38%(few-shot)and 242%accuracy improvement in paraquat concentration prediction,and unsealed the chemical resolution of biomedical hyperspectral images,especially in the spectral fingerprint *** precisely preprocessed various Raman spectra from different spectroscopy devices,laboratories,and diverse *** scheme will enable biomedical mechanism screening with the label-free volumetric molecular imaging tool on organism and disease metabolomics profiling with a scenario of high throughput,cross-device,various analyte complexity,and diverse applications.

关键词： spectral scheme resolution

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Design of a robust PID-PSS for an uncertain power system with simplified stability conditions

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Protection and Control of Modern Power Systems 2020年第1期5卷 222-237页

作者： Vijaya Lakshmi A.S.V Ramalinga Raju Manyala Siva Kumar Mangipudi department of eee G.V.P College of Engineering for WomenVisakhapatnamIndia department of eee JNTU KakinadaKakinadaIndia department of eee Gudlavalleru Engineering CollegeGudlavalleruAndhra PradeshIndia

In a deregulated power system uncertainty exists and lack of sufficient damping can lead to Low FrequencyOscillations (LFO). The problem can be addressed using robust Power System Stabilizers (PSS). In this paper, anoptimal procedure to design a robust PID-PSS using interval arithmetic for the Single Machine Infinite Bus (SMIB)power system is proposed. The interval modelling captures the wide variations of operating conditions in boundsof system coefficients. In the proposed design procedure, simple and new closed loop stability conditions for anSMIB interval system are developed and are used to design an optimum PID-PSS for improving the performance ofan SMIB system. The optimum PID-PSS is attained by tuning the parameters using the FMINCON tool provided inMATLAB. The robustness of the proposed PID-PSS design is validated and compared to other notable methods inthe literature when the system is subjected to different uncertainties. The simulation results and performance errorvalues show the effectiveness of the proposed robust PID-PSS controller.

关键词： Low frequency oscillations Uncertainty Power system stabilizer Robust controller Interval systems

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Minimisation of electric field stress at triple junction of a functionally graded cone type spacer in a gas insulated busduct with metal inserts

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High Voltage 2017年第2期2卷 110-118页

作者： Yerra Swamy Naidu Gundavarapu Venkata Nagesh Kumar department of eee Vizag Institute of TechnologyVisakhapatnamIndia department of eee Vignan's Institute of Information TechnologyVisakhapatnamIndia

Insulation integrity of supporting insulator plays a vital role for determining the continuity of service of the gas insulated substation which depends upon the electric field stress distribution on the surface of the *** junction formed by the conductor,SF6 gas and support insulator is another critical area where the field stress is to be maintained at minimum *** control is a technique employed for obtaining uniform field stress along the surface of the spacer but this technique may sometimes leads to very uneven *** this study,a functional graded material is designed for the standard cone type spacer to obtain uniform field stress along the surface of spacer to overcome the above *** grading of spacer is done with different *** field is computed for three cases namely grading to high,grading to low and U *** metal inserts were tuned and stress is obtained in account of lower fields at the triple point junction and an improved uniform field distribution along the surface is obtained.

关键词： stress graded field

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Modeling and Analysis of Novel Multilevel Inverter Topology with Minimum Number of Switching Components

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Computer Modeling in Engineering & Sciences 2017年第4期113卷 461-473页

作者： V.Thiyagarajan P.Somasundaram department of eee SSN College of EngineeringKalavakkamTamilnadu603110India department of eee CEGAnna UniversityChennaiTamilnadu600025India

This paper proposes a novel single phase symmetrical and asymmetrical type extendable multilevel inverter topology with minimum number of *** basic circuit of the proposed inverter topology consist of four dc voltage sources and 10 main switches which synthesize 9-level output voltage during symmetrical operation and 17-level output voltage during asymmetrical *** comparison between the proposed topology with conventional and other existing inverter topologies is presented in this *** advantages of the proposed inverter topology include minimum switches,less harmonic distortion and minimum switching *** performance of the proposed multilevel inverter topology has been analyzed in both symmetrical and asymmetrical *** simulation model is developed using MATLAB/SIMULINK software to verify the performance of the proposed inverter.

关键词： Multilevel inverter symmetric asymmetric THD on state switches

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Impact of communication time delays on combined LFC and AVR of a multi-area hybrid system with IPFC-RFBs coordinated control strategy

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Protection and Control of Modern Power Systems 2021年第1期6卷 89-108页

作者： C H.Naga Sai Kalyan G.Sambasiva Rao eee department Acharya Nagarjuna UniversityGunturA.P.India eee department RVR&JC College of EngineeringGunturA.P.India

In this paper,the impact of communication time delays(CTDs)on combined load frequency control(LFC)and automatic voltage regulation(AVR)of a multi-area system with hybrid generation units is *** reveals that CTDs have significant effect on system performance.A classical PID controller is employed as a secondary regulator and its parametric gains are optimized with a differential evolution-artificial electric field algorithm(DE-AEFA).The superior performance of the presented algorithm is established by comparing with various optimization algorithms reported in the *** investigation is further extended to integration of redox flow batteries(RFBs)and interline power flow controller(IPFC)with *** reveals that IPFC and RFBs coordinated control enhances system dynamic ***,the robustness of the proposed control methodology is validated by sensitivity analysis during wide variations of system parameters and load.

关键词： Combined LFC-AVR Communication time delays(CTDs) IPFC-RFBs strategy DE-AEFA algorithm

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Nucleus-acoustic solitary waves in self-gravitating degenerate quantum plasmas

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Chinese Physics B 2018年第4期27卷 191-197页

作者： D M S Zaman M Amina P R Dip A A Mamun department of Physics Jahangirnagar University department of eee Bangladesh University of Business and Technology(BUBT)

Nucleus-acoustic（NA） solitary waves（SWs） propagating in a self-gravitating degenerate quantum plasma（SDQP）system（containing non-relativistically degenerate heavy and light nuclei,and non-/ultra-relativistically degenerate electrons） have been theoretically *** modified Korteweg–de Vries（m K-d V） equation has been derived for both planar and non-planar geometry by employing the reductive perturbation *** is shown that the NA SWs exist with positive（negative） electrostatic（self-gravitational） *** is also observed that the effects of non-/ultra-relativistically degenerate electron pressure,dynamics of non-relativistically light nuclei,spherical geometry,*** modify the basic features（e.g.,amplitude,width,speed,etc.） of the NA *** applications of our results,which are relevant to astrophysical compact objects,like white dwarfs and neutron stars,are briefly discussed.

关键词： self-gravitational potential solitary waves

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Implementation of PSOANN Optimized PI Control Algorithm for Shunt Active Filter

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Computer Modeling in Engineering & Sciences 2020年第3期122卷 863-888页

作者： M.Sujith S.Padma department of eee IFET College of EngineeringVillupuramTamilnadu605108India. department of eee Sona College of EngineeringSalem636005India.

This paper proposes the optimum controller for shunt active filter(SAF)to mitigate the harmonics and maintain the power quality in the distribution *** consists of shunt active filter,Voltage Source Inverter(VSI),series inductor and DC bus and nonlinear *** proposed hybrid approach is a combination of Particle Swarm Optimization(PSO)and Artificial Neural Network(ANN)termed as *** PI controller gain parameters of kp and ki are optimized with the help of *** PSOANN improves the accuracy of tuning the gain parameters under steady and dynamic load conditions;thereby it reduces the values of THD within the prescribed limits of Ieee *** PSO optimizes the dataset of terminal voltage and DC voltage present in shunt active filter for different load *** optimized dataset acts as the input for the controller to predict the optimal gain with minimal error and to generate the optimized control signal for the *** proposed methodology is modelled and simulated with the help of MATLAB/Simulink platform and illustrated the few test cases considered for exhibiting the performance of proposed hybrid *** experimental results are measured with developed laboratory prototype and compared with the simulation results to validate the effectiveness of the proposed control methodology.

关键词： Artificial neural network particle swarm optimization shunt active filter voltage source inverter total harmonic distortions.

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Modified vector controlled DFIG wind energy system based on barrier function adaptive sliding mode control

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Protection and Control of Modern Power Systems 2019年第1期4卷 34-41页

作者： Tummala S.L.V.Ayyarao department of eee GMR Institute of TechnologyRajam532127India

Increased penetration of wind energy systems has serious concerns on power system stability. In spite of several advantages, doubly fed induction generator (DFIG) based wind energy systems are very sensitive to grid disturbances. DFIG system with conventional vector control is not robust to disturbances as it is based on PI controllers. The objective of this paper is to design a new vector control that is robust to external disturbances. To achieve this, inner current loop of the conventional vector control is replaced with sliding mode control. In order to avoid chattering effect and achieve finite time convergence, the control gains are selected based on positive semi-definite barrier function. The proposed barrier function adaptive sliding mode (BFASMC) is evaluated by testing it on a benchmark multi-machine power system model under various operating conditions. The simulated results show that the proposed method is robust to various disturbances.

关键词： Doubly fed induction generator(DFIG) Wind power generation Sliding mode control Robust control

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