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4th International Conference on Intelligent Technologies and Applications (INTAP)

作者： Yadav, Uma Gupta, Anju Ahuja, Rajesh Kumar JC Bose Univ Sci & Technol YMCA Faridabad India

ISBN: (纸本)9783031105258;9783031105241

The presented research paper deals with design algorithm and its Analysis on BP (bode plot) of PRES and Novel PRESH (PRES + RESH) controller Interfaced with three phase GTSPPS (Grid-Tied Solar Photovoltaic Power System) and its simulation on MATLAB. Presently, for eliminating the harmonic from three phase SPPS, various filters and controllers have already been proposed but it either resulted in increase of computational load or made the system bulky. The proposed research paper will discuss the design procedure of two controller helpful in mitigating the THD of three phase SPPS near to 1% and thus satisfying the IEEE standard 519 and 1547. PRES controller is suitable in eliminating the THD when grid does not suffer any abnormal condition whereas Novel PRESH controller can be incorporated when grid suffers from abnormal condition. Further, the difference between two techniques will be discussed with its digital implementation.

关键词： GTSPPS PRESH PRES RESH THD bode plot

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On the bode Diagram plot of Switched Converters Using MATLAB Simulink - a Tutorial Approach 14

On the Bode Diagram Plot of Switched Converters Using MATLAB...

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14th IEEE Latin American Symposium on Circuits and Systems (LASCAS)

作者： Barrera Leguizamon, Daniel M. Urbina, Robert Paez, Carlos Fajardo, Arturo Perilla, Gabriel Pontificia Univ Javeriana Dept Elect Engn Bogota Colombia

ISBN: (纸本)9781665457057

One approach to designing the switched converter control is to determine the converter frequency response (i.e., bode diagram) by direct measurement or dedicated simulation. The last option is preferred because it reduces development time and cost. Moreover, several circuit simulators (e.g., Ltspice((R))) lack a tool for generating nonlinear circuit bode plots. To overcome this limitation, this paper proposes a simulation procedure to generate the bode plots of these type of circuits, which is based on the Middlebrook approach, MATLAB((R)) and Simulink((R)). The proposed procedure is validated by a case study based on a conventional DC/DC Boost converter. The theoretical, simulated, and experimental results were consistent, allowing validation of the proposed method. This paper was written using a tutorial approach to motivate the junior engineers to design the converter control using CAD tools instead of the "experiment trial-error" approach.

关键词： bode plot Switched Converters Middlebrook Method Simulink((R)) MATLAB((R))

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bode plot and Impedance Asymptotes for Light-Load Regulation of LLC Series Resonant Converter 8

Bode Plot and Impedance Asymptotes for Light-Load Regulation...

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8th IEEE International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia)

作者： Yeon, Cheol-O. Kim, Jong-Woo. Park, Moo-Hyun. Jong, Yu-Jin. Lim, Cheon-Yong Moon, Gun-Woo Korea Adv Inst Sci & Technol Dept Elect Engn Daejeon 34141 South Korea

ISBN: (纸本)9781509012107

In general, the LLC series resonant converter (LLC SRC) is an attractive topology for the applications which require the wide input variation and high efficiency especially at light load condition. This is because of its wide gain capability with pulse-frequency modulation and zero-voltage-switching over the entire load condition. However, there is a regulation problem that the output voltage increases as the output current decreases. In this paper, bode plot and impedance asymptotes analyses have been conducted to obtain an intuitive sense for the regulation characteristic of LLC SRC under light-load condition. Moreover, in order to improve the regulation characteristic, a new resonant tank with an additional capacitor is proposed and its design guideline is also provided by bode plot and impedance asymptotes analyses. Therefore, the proposed LLC SRC achieves the very light-load regulation while it can maintain the advantages of typical LLC SRC.

关键词： LLC series resonant converter (LLC SRC) Light-load regulation bode plot Impedance asymptotes No-load regulation

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Universally Applicable DC-Link RC Snubber Design Method for Switching Voltage Overshoot Reduction

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 2025年第2期72卷 1249-1260页

作者： Lee, Sangwhee Chen, Feida Sarlioglu, Bulent Univ Wisconsin Elect & Comp Engn Dept Madison WI 53726 USA

This article proposes a new dc-link resistor-capacitor (RC) snubber design method that overcomes three challenges in the conventional eigenvalue-based design methods (i.e., not universally applicable for various parasitic circuit parameters, challenging to consider zeros in the design process, and requiring numerical iterations). The proposed dc-link RC snubber design method universally applies to systems with various parasitic circuit values (e.g., parasitic inductances and capacitances). The proposed design method uses a bode plot instead of eigenvalues, inherently including the impact of zero on switching voltage overshoot in the design process. Considering both eigenvalues and zeros, enables the proposed design methods to yield dc-link RC snubbers with superior performance. The dc-link RC snubber values are given by closed-form expressions in the proposed design method, eliminating the need for numerical iterations. The experimental results from two cases with different parasitic circuit values show that the proposed design method yields dc-link RC snubber values with up to about 10% less switching voltage overshoot than the dc-link snubber values given by the state-of-the-art eigenvalue-based design method.

关键词： Snubbers Design methodology Switches Voltage Switching circuits Poles and zeros Inductance bode plot dc-link RC snubbers wide bandgap (WBG) devices

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Review on electrochemical impedance spectroscopy: a technique applied to hollow structured materials for supercapacitor and sensing applications

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APPLIED SPECTROSCOPY REVIEWS 2025年第1期60卷 30-55页

作者： Panchal, Kajal Bhakar, Kaushalya Sharma, Kritika S. Kumar, Dinesh Prasad, Surendra Cent Univ Gujarat Sch Chem Sci Gandhinagar India Univ South Pacific Sch Agr Geog Environm Ocean & Nat Sci SAGEONS Discipline Biol & Chem Sci Suva Fiji

Electrochemical reactions' rate and their behavior at the electrode-electrolyte interface are better understood using electrochemical impedance spectroscopy (EIS). EIS is an analytical, electrochemical, and noninvasive technique, which provides both quantitative and qualitative analysis with higher resolution data over the traditional electrochemical techniques. It computes impedance of the concerned electrochemical system over a wide range of frequencies and measures the response (Current or voltage) with a phase shift. In this regard, this primer provides a guide for understanding the fundamentals of the EIS technique, and their theoretical background, followed by the discussion of electric circuit modeling, and deconvolution of impedance data using Nyquist and bode plot. EIS data majorly describe the surface kinetics of the reaction, mass transport, and interpret the electronic properties of the electrode material. Thus, this review includes a detailed explanation of EIS in understanding the electrochemical behavior of electrode materials within supercapacitors and electrochemical sensing applications. The review covers the latest literature that has been done on hollow structure material and highlights their electrochemical behavior based on EIS data analysis.

关键词： Impedance hollow structures circuit Nyquist plot bode plot sensing supercapacitor

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New method for graphing impedance values as an analytical tool suitable for electrochemical impedance spectroscopy

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ELECTROCHIMICA ACTA 2025年 509卷

作者： Siroma, Zyun Kuratani, Kentaro Natl Inst Adv Ind Sci & Technol Res Inst Electrochem Energy Ikeda Osaka 5638577 Japan

A new method for graphing electrical impedance values named a "differentiation-based bode plot" is proposed. This method facilitates the analysis procedure and reduces the arbitrariness of the interpretation of electrochemical impedance spectroscopy (EIS) data. Among the various methods for graphing impedance values, Nyquist plots are commonly adopted (primarily in the field of EIS) because of the apparent correlation between their shape and the corresponding equivalent circuit. However, because Nyquist plots do not contain frequency information, bode phase and magnitude plots are frequently utilized. Although such plots are suitable for determining the absolute magnitude and phase of the impedance, they are not always useful for selecting the structure of an equivalent circuit, which is a hypothetical model for electrochemical cells. In the proposed method, instead of the real (Z') and imaginary (Z'') parts, two functions of the impedance derivatives with respect to frequency, i.e., dZ'/d(log f) and dZ''/d(log f), are plotted. As substitutions for the bode phase and magnitude plots, arctan{dZ''/d(log f) divided by dZ'/d(log f)} and log[sqrt{(dZ'/d(log f))2 + (dZ''/d(log f))2}] are plotted against log f. Unlike the classical bode plot, the differentiation-based bode plot is independent of the lateral shift in the Nyquist plot, which is advantageous for determining an equivalent circuit. To demonstrate this advantage, the impedance values of typical equivalent circuits used in electrochemistry are calculated and plotted to compare differentiation-based bode plots with Nyquist and classical bode plots.

关键词： Electrochemical impedance spectroscopy bode plot Nyquist plot

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Rheo-impedance behavior of cellulose nanofibers produced by mechanical processing

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CELLULOSE 2024年第18期31卷 10771-10784页

作者： Yamagata, Yoshifumi Takasaki, Yuichi Miyamoto, Keisuke Anton Paar Japan K K Riverside Sumida 1Fl1-19-9Tsutsumi DoriSumida K Tokyo Japan

CNFs are one of the renewable and the sustainable resources with low environmental impact and have various characteristics such as increased strength and weight reduction when added to resins. Since CNFs are one of the new materials that can fulfill the goals of the Sustainable Development Goals (hereafter abbreviated as SDGs), many researchers have been studying the nano-fibrillation of wood fibers. From the viewpoint of SDGs, it is necessary to avoid using a large amount of chemical agents and consuming a large amount of energy for the production of CNFs. To realize these requirements, it is important to find a way to industrially utilize CNFs containing insufficiently nanosized fibers, and for these purposes, it is essential to evaluate the physical properties of these CNFs from multiple perspectives. Cellulose fibers are intrinsically insulating materials, but how their electrochemical properties are changed by nano-fibrillization has been little studied. Therefore, we decided to clarify the relationship between the size of CNFs and the electrochemical impedance properties of the CNF suspensions containing un-fibrillated fibers, which were prepared by a wet refinement system. The fiber diameter remained constant as the number of mechanical treatments (hereafter referred to as the "number of collisions") increased. On the other hand, the cumulative medium volume diameter, D50, defined as the apparent fiber length (hereafter referred to as the "fiber length", in microns), significantly decreases with the increasing number of collisions. The rheo-impedance |Z| of the CNF suspension remained nearly constant in the intermediate frequency range of 103-106 Hz, even if the internal structure of the system was deformed by the increasing shear rate. This means that the electrochemical properties of the CNFs are independent of the changes in the macroscopic aggregation structure. Furthermore, the internal resistance R1 calculated from the impedance |Z| characteristics (Nyq

关键词： Nanocellulose Rheo-impedance Shear thinning bode plot Nyquist plot

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An Improved Nonlinear Droop Control Strategy in DC Microgrids

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2024年第5期39卷 5058-5073页

作者： Yang, Chunxiaolu Gao, Fei Zhang, Boshen Shanghai Jiao Tong Univ Coll Smart Energy Shanghai 200240 Peoples R China Minist Educ Key Lab Control Power Transmiss & Convers Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Dept Elect Engn Shanghai 200240 Peoples R China

Droop control has drawn widespread attention and various nonlinear droop characteristics have been developed in dc microgrids. This article proposes an improved nonlinear droop control strategy, which uses the difference between the squared nominal voltage and the squared dc voltage as the droop input and generates the ac current reference directly from the droop characteristic. Compared with the traditional dual-loop droop control strategy, this method can provide faster transient response due to the elimination of the external dc voltage or current loop. And the bus voltage can be regulated very compactly, which is an optimization of steady-state performance. In this article, the stability assessment that violates the constraint conditions of the conventional impedance-based stability criterion is investigated, which considers the number of right-half-plane poles of the open-loop transfer function. The Nyquist criterion of generalized bode plot is used to analyze the system stability. An adaptive current sharing strategy is proposed to improve the current sharing accuracy in multisource operation. This article also discusses the comprehensive design process for determining droop gain. Finally, experimental results validate the theoretical analysis.

关键词： bode plot dc microgrid droop control impedance-based stability criterion right-half-plane (RHP) poles

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Identification of Crack in the Helical Spring of the Vibratory Feeder Using Operational Modal Analysis

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JOURNAL OF FAILURE ANALYSIS AND PREVENTION 2025年第1期25卷 487-501页

作者： Ghazwani, M. H. Chandravanshi, M. L. Jazan Univ Fac Engn Dept Mech Engn POB 45124 Jazan 45124 Saudi Arabia Indian Sch Mines Indian Inst Technol Dept Mech Engn Dhanbad Jharkhand India

This paper delineates the procedure for crack detection in helical spring installed on a vibratory feeder using operational modal analysis technique. The variations in modal parameters were identified using vibration data acquired in the form of auto-power spectrum (APS) and cross-power spectrum (CPS) during normal operation of the vibratory feeder. In the second step, the crack was induced in one of the springs of the vibratory feeder, and APS and CPS were acquired during its operating conditions. Modal parameters were recorded through a dynamic signal analyzer in the form of auto-power spectra (APS) and cross-power spectra (CPS) in healthy as well as cracked helical springs installed in the vibratory feeder during operating conditions. The variations in modal parameters, which include vibrating frequencies, operating deflecting shapes and values damping ratios (%), MAC values, CoMAC values, contours and bode plots were compared. Observations of these parameters were used to predict the failures in the spring of vibratory feeder.

关键词： Operational modal analysis (OMA) Auto-power spectrum (APS) Cross-power spectrum (CPS) Modal parameters bode plot Spectrogram

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One-step synthesis and fabrication of ZrMo2O8 nanostructures as advanced electrode material for energy storage applications

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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY 2024年 137卷 162-173页

作者： Rajkumar, S. Karthikeyan, M. Manohar, A. Dhineshkumar, S. Merlin, J. Princy SRM TRP Engn Coll Dept Chem Tiruchirappalli 621105 Tamil Nadu India Periyar Maniammai Inst Sci & Technol Deemed Univ Dept Chem Thanjavur 613403 Tamil Nadu India Bharathidasan Univ Bishop Heber Coll Autonomous PG & Res Dept Chem Tiruchirappalli 620017 Tamil Nadu India

Nanostructures of metal molybdates show great potential as high-performance electrode materials for the forthcoming development of energy storage devices. In present work, ZrMo2O8 nanostructure was constructed using a simple chemical procedure and followed by examination with the aid of several spectral and analytical tools. The supercapacitive properties of ZrMo2O8 electrode material were investigated using Cyclic voltammetry (CV), Galvanostatic charge-discharge (GCD) and Electrochemical Impedance Spectroscopy measurements (EIS). The as-prepared ZrMo2O8 nanostructures as supercapacitor (SC) electrode material exhibited pseudocapacitive performance with notable value of 288C g-1 at 1 A/g, significant cycling stability and 92.5% capacity retention with the coulombic efficiency of 87.4% even after 5000 GCD cycles at 1 A/g. The morphological investigations indicated that the higher Specific capacity (Cs) was primarily caused by the significant increase in active sites as well as active surface area. The bode phase angle plot of ZrMo2O8 exhibited a low frequency intercept, with emphasis at approximately - 52 degrees phase angle, indicating a superior redox signature. The results infered that ZrMo2O8 nanostructures are promising candidates for high performance energy storage applications.

关键词： Supercapacitors bode plot Specific capacity

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