Log in

Relevant bibliographies by topics / Harmonic reason / Journal articles

To see the other types of publications on this topic, follow the link: Harmonic reason.

Journal articles on the topic 'Harmonic reason'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Harmonic reason.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

M.J., Sridevi, and Rajanna K.R. "Harmonic Energy of a Graph." Journal of Statistics and Mathematical Engineering 5, no. 1 (2019): 20–26. https://doi.org/10.5281/zenodo.2611226.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Song, Xing Yu, Jing Chen, Qing Wang, and Shi Jie Deng. "Harmonic Analyzing and Filtering of Motor Discrete Variable Frequency Soft Starter." Applied Mechanics and Materials 713-715 (January 2015): 1401–4. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.1401.

Full text

Abstract:

A large number of harmonic is mainly produced by with the discrete variable frequency soft starter. The harmonic during the motor soft starting is characterized by the high energy consumption and signal interference. Therefore, harmonic analyzing and filtering of motor discrete variable frequency soft starter is presented in this paper to achieve low energy consumption and ensure the motor soft starting stably. The following works have been done in the study: introduce the reason of harmonics appearance, analyze the harmonic, and present the filtering approach. The motor soft starter developed

APA, Harvard, Vancouver, ISO, and other styles

3

Mirajkar, Nilesh Balkrishna, Rajesh M. Dharaskar, Tousif G. Kazi, Rohit R. Burte, and Rakesh R. Jadhav. "Harmonics: The Distortion in Supplied Waveform – Causes and Remedies." International Journal of Current Microbiology and Applied Sciences 12, no. 5 (2023): 39–44. http://dx.doi.org/10.20546/ijcmas.2023.1205.005.

Full text

Abstract:

In Industrial Distribution Power System, the use of electronic devices such as motor drives, rectifiers or converters, power supplies and power electronic devices has been increased tremendously from last decade. In such a systems, switching operations are more in their regular work. It causes distortion in supplied waveform (Harmonics). This increases the Total Harmonic Distortion (THD) of Industrial Distribution Power System which is considered as the main reason for the power quality problems. This paper includes the sources of the harmonics, effects of the harmonics and the recommendations

APA, Harvard, Vancouver, ISO, and other styles

4

Liu, Yun Yun, Jiang Zeng, and Kai Liang Wang. "A Harmonic Detecting Scheme Based on BP Neural Network." Applied Mechanics and Materials 392 (September 2013): 759–64. http://dx.doi.org/10.4028/www.scientific.net/amm.392.759.

Full text

Abstract:

General harmonic detecting scheme is using the Fast Fourier Transform (FFT) for detection of all the harmonics (such as 1 to 50 times). While power units often do not care about the specific values of all the harmonics, but is only concerned with some key harmonics or several overall indicators. For the above reason, a new harmonic detecting scheme based on the algorithm of BP neural network is presented in this paper. It does not need to calculate all the harmonics, when the detection of individual indicators or overall indicators which are concerned by users can be achieved,and to achieve th

APA, Harvard, Vancouver, ISO, and other styles

5

Fei, Zhenyan, Ming Lyu, Mariano Méndez, et al. "The Harmonic Component of the Millihertz Quasi-periodic Oscillations in 4U 1636–53." Astrophysical Journal 922, no. 2 (2021): 119. http://dx.doi.org/10.3847/1538-4357/ac2501.

Full text

Abstract:

Abstract We studied the harmonics of the millihertz quasi-periodic oscillations (mHz QPOs) in the neutron star low-mass X-ray binary 4U 1636–53 using the Rossi X-ray Timing Explorer observations. We detected the harmonics of the mHz QPOs in 73 data intervals, with most of them in the transitional spectra state. We found that the ratio between the rms amplitude of the harmonic and that of the fundamental remains constant in a wide range of the fundamental frequency. More importantly, we studied, for the first time, the rms amplitude of the harmonics versus energy in 4U 1636–53 in the 2–5 keV ra

APA, Harvard, Vancouver, ISO, and other styles

6

Sonmezocak, Temel, Onur Akar, and Umit Kemalettin Terzi. "High Performance Adaptive Active Harmonic Filter Design for Non-Linear LED Loads." Issue 01-2022, no. 01-2022 (February 2022): 29–38. http://dx.doi.org/10.33383/2021-083.

Full text

Abstract:

Today, illumination systems use approximately 1/3 of the electrical energy produced. For this reason, new technologies constantly increase energy efficacy in illumination technology. Consequently, the use of LED type light sources gets more widespread with low power electronics-based versions. The most important advantage of this type of systems has high luminous efficacy. However, since electronic systems have non-linear static loads, they cause unwanted harmonics in electrical distribution systems. Harmonics affect the operational safety as they cause unnecessary heating of the conductors in

APA, Harvard, Vancouver, ISO, and other styles

7

Benaouadj, Mahdi, Zouhir Boumous, and Samira Boumous. "Active Harmonic Filtering for Improving Power Quality of an Electrical Network." Journal Européen des Systèmes Automatisés 55, no. 3 (2022): 397–403. http://dx.doi.org/10.18280/jesa.550312.

Full text

Abstract:

The increase use of polluting equipment, especially in the field of power electronics, has caused appearance of harmonics and deterioration in the supplied current wave quality. For this reason, several harmonic pollution control methods have been developed, and the use of the active filtering presents the most efficient and appropriate solution. This work concerns improving energy quality of an electrical network by using an active parallel filter. To achieve this objective, three essential steps were pursued: identification of the harmonic currents, insertion and control of an active paralle

APA, Harvard, Vancouver, ISO, and other styles

8

Sang, Lin, Jian Cheng Ye, and Ming Pan. "Characteristic and Model Analysizes of Steady-State Harmonic Source for DC Charger." Applied Mechanics and Materials 336-338 (July 2013): 536–41. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.536.

Full text

Abstract:

The objective of this paper is to present the system construction and operational principle for a DC charger of electric vehicle. By means of analyzing AC and DC sides for the chargers, a reason was derived theoretically for producing specified harmonic current while absorbing fundamental wave of electric power system. The modeling and measuring procedures of multi-harmonic source for single and multiple chargers were proposed. The summation effect of harmonics for charge/exchange station which was regard as a public coupling circuit (PCC) of the electric power system. The simulation and measu

APA, Harvard, Vancouver, ISO, and other styles

9

T., D. Dongale1 D. A. Kulkarni2 M. D. Uplane 3. "HARMONICS ANALYSIS OF FOUR SWITCH THREE PHASE INVERTER." International Journal of Information Technology, Modeling and Computing (IJITMC) 1, November (2018): 01–07. https://doi.org/10.5281/zenodo.1421496.

Full text

Abstract:

In the viewpoint of reliability implication and cost effectiveness of three phase inverter, there should be less device count in inverter topology and fewer losses in the semiconductor switches. The earlier reported less device count topology by many research groups are facing the problem of Total Harmonic Distortion (THD). The imperfect design value of DC link capacitor is the main reason of Harmonic Distortion (THD) problem. The ripple in the dc link voltages of Voltage Source Inverter (VSI) is leads to additional harmonics distortion. This paper present the simulative view of minimization o

APA, Harvard, Vancouver, ISO, and other styles

10

Guo, Jia, Zhi Gang Li, Ya Ping Cheng, Kai Huang, and Chun Yan Cui. "A Method of Harmonic Current Suppression in Photovoltaic Grid-Connected Systems." Applied Mechanics and Materials 303-306 (February 2013): 1145–48. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.1145.

Full text

Abstract:

The grid-connected inverter plays an important role in the photovoltaic power generation systems, the output of the grid current harmonics affect the stability of the grid. The reason of grid inverter output current distortion, a detailed analysis of current waveform control strategy and its effectiveness of the grid-connected inverter harmonic current suppression is introduced based on the d-q coordinates in this paper.

APA, Harvard, Vancouver, ISO, and other styles

11

Iqbal, Muhammad Naveed, Lauri Kütt, Bilal Asad, Toomas Vaimann, Anton Rassõlkin, and Galina L. Demidova. "Time Dependency of Current Harmonics for Switch-Mode Power Supplies." Applied Sciences 10, no. 21 (2020): 7806. http://dx.doi.org/10.3390/app10217806.

Full text

Abstract:

This paper presents the time-dependent variance in the current harmonics emission by power supplies during power quality measurements. Power quality problems are becoming more significant with the adoption of power electronic-based circuits such as power supplies. The switch-mode power supplies are widespread as industrial, commercial, and domestic electrical loads. They draw non-sinusoidal current from the utility and inject current harmonics. Therefore, they are the reason for poor power quality and reduction in the power factor. The current harmonics emission from these power supplies depen

APA, Harvard, Vancouver, ISO, and other styles

12

Chabni, Fayçal, Rachid Taleb, and M’hamed Helaimi. "Optimum SHEPWM for a new 21-level inverter topology using numerical optimization methods: experimental comparative study." Journal of Vibration and Control 24, no. 23 (2018): 5556–69. http://dx.doi.org/10.1177/1077546318758799.

Full text

Abstract:

This article presents the application of the harmony search (HS) optimization algorithm for harmonic elimination in a new topology of multilevel inverters with a reduced number of electronic switching elements. The main objective of the harmonic elimination strategy is eliminating undesired low rank harmonics in order to improve the quality of the output waveform. The harmonic elimination strategy is achieved by solving a system of nonlinear equations. In this paper, HS optimization is applied using artificial neural networks (ANNs) on a new 21-level inverter topology. The algorithm is based o

APA, Harvard, Vancouver, ISO, and other styles

13

Aljwary, Adel, Ziyodulla Yusupov, Olimjon Toirov, and Rustam Shokirov. "Mitigation of load side harmonic distortion in standalone photovoltaic based microgrid." E3S Web of Conferences 304 (2021): 01010. http://dx.doi.org/10.1051/e3sconf/202130401010.

Full text

Abstract:

Photovoltaic (PV) system as one part of distributed energy resources is becoming an alternative for low and medium distribution network of microgrid. By the reason of a wide implementation of power electronic and non-linear loads, harmonics distortion is one of the main problems for the power systems. There are several filter types to mitigate the harmonics. The passive filter is distinguished by its simplicity and economical options from another filters. In this paper, the passive single tuned filter (STF) is used to minimize harmonics distortion in standalone PV based microgrid. A solar PV a

APA, Harvard, Vancouver, ISO, and other styles

14

Venkatesh, S. "Design and Implementation of Grid Connected Solar Inverter using Adaptive Harmonic Elimination Technique." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (2021): 5123–29. http://dx.doi.org/10.22214/ijraset.2021.36082.

Full text

Abstract:

Our project mainly focuses work a lot being carried out in the ﬁeld of distributed generation. For the electric grid, so Many distributed generation systems are being made. At this time when the non-renewable sources of energy such as oil, coal, etc are very fast disappearing, a study of distributed generation systems (DGs) and Establishing of such systems using renewable sources of energy becomes very important. we have seen several major problems will happen, when harmonic content of the current is flows into the grid, like this issue several issues are going to meet. When a Distribution Gen

APA, Harvard, Vancouver, ISO, and other styles

15

Cebulla, Mario, Ekkehard Stürzebecher, and Claus Elberling. "Objective Detection of Auditory Steady-State Responses: Comparison of One-Sample and q-Sample Tests." Journal of the American Academy of Audiology 17, no. 02 (2006): 093–103. http://dx.doi.org/10.3766/jaaa.17.2.3.

Full text

Abstract:

Auditory steady-state responses (ASSR) are expected to be useful for the objective, frequency-specific assessment of hearing thresholds in small children. To detect ASSR close to the hearing threshold, a powerful statistical test has to be applied. At present, so-called one-sample tests are used. These tests only evaluate the phase, or the phase and amplitude, of the first harmonic, that is, the fundamental frequency. It is shown that higher harmonics with significant amplitudes are also contained in the ASSR spectrum. For this reason, statistical tests that only consider the first harmonic ig

APA, Harvard, Vancouver, ISO, and other styles

16

Arof, Saharul, Philip Mawby, Hamzah Arof, and Emilia Noorsal. "Low Harmonics Plug-in Home Charging Electric Vehicle Battery Charger Simulation Model of Zero Crossing." IOP Conference Series: Earth and Environmental Science 1261, no. 1 (2023): 012031. http://dx.doi.org/10.1088/1755-1315/1261/1/012031.

Full text

Abstract:

Abstract Harmonic currents are high in conventional rectifiers. The previous work proposed a new battery charger circuit to reduce harmonics effect and improve total harmonic distortion (THD). The design and development of a home charging electric vehicle battery charger circuit should anticipate potential issues. For this reason, the proposed battery charger, buck chopper, and zero cross circuits must be simulated before real hardware implementation. Simulation and simulation models are needed to describe system behaviour because experimentation might be dangerous, expensive, and time-consumi

APA, Harvard, Vancouver, ISO, and other styles

17

Alberto, Pirni. "Hacia una crítica de la razón armónica." Con-textos kantianos, no. 2 (November 17, 2015): 20–31. https://doi.org/10.5281/zenodo.33888.

Full text

Abstract:

The essay focuses on the attempt of articulating the idea of a <em>critique of harmonic reason </em>understood as a comprehensive (and not explicitly expressed) project within the Kant’s theoretical path. In the first paragraph, the attempt of elaborating a <em>critical </em>idea of harmony is addressed both biographically and theoretically by referring to the intense period 1783-1786. In the second paragraph, we introduce and discuss a methodical idea of <em>critic harmony</em>, whose roots are grounded within the framework of both pre-critical and critical period. Finally, as presented

APA, Harvard, Vancouver, ISO, and other styles

18

Starikov, Alexsandr V., Sergey L. Lisin, Olga S. Belyaeva, and Viktor A. Kirdyashev. "Method for reducing the amplitudes of higher harmonics in the output voltage of the frequency converter." Vestnik of Samara State Technical University. Technical Sciences Series 29, no. 1 (2021): 120–32. http://dx.doi.org/10.14498/tech.2021.1.9.

Full text

Abstract:

Modern low-voltage frequency converters, built on the principle of stand-alone inverters with pulse-width modulation, have large amplitudes of higher harmonics in the output voltage. This adversely affects the operation of an asynchronous or synchronous motor connected to such a converter, since it causes a decrease in the efficiency of the AC machine. The analysis of the reasons for the poor harmonic composition of the output voltage of traditional inverters with sinusoidal pulse-width modulation is carried out and it is noted that the main one is the introduction of "dead" time when switchin

APA, Harvard, Vancouver, ISO, and other styles

19

Giha Yidi, Salim Adolfo, Vladimir Sousa Santos, Kelly Berdugo Sarmiento, John E. Candelo-Becerra, and Jorge de la Cruz. "Comparison of Reactive Power Compensation Methods in an Industrial Electrical System with Power Quality Problems." Electricity 5, no. 3 (2024): 642–61. http://dx.doi.org/10.3390/electricity5030032.

Full text

Abstract:

This paper compares concentrated and distributed reactive power compensation to improve the power factor at the point of common connection (PCC) of an industrial electrical system (IES) with harmonics. The electrical system under study has a low power factor, voltage variation, and harmonics caused by motors operating at low loads and powered by variable-speed drives. The designed compensation system mitigates harmonics and reduces electrical losses with the shortest payback period. Four solutions were compared, considering concentrated and distributed compensation with capacitor banks and har

APA, Harvard, Vancouver, ISO, and other styles

20

Serdiuk, T. M., and V. I. Gavryliuk. "EXPERIMENTAL STUDY OF INTERFERENCE IN RAIL CIRCUITS." Science and Transport Progress, no. 9 (December 25, 2005): 15–18. http://dx.doi.org/10.15802/stp2005/19901.

Full text

Abstract:

The occurrence reasons of 50 Hz frequency interference in rail circuits are analysed. The interference was registered on some railway sections by an experimental research. The average value of amplitude has made 1.8 А in a dividing pause of a code «Green». The occurrence reason of mentioned harmonic is the work of substation rectifiers.

APA, Harvard, Vancouver, ISO, and other styles

21

Drey, Nadezhda M., Ayrat G. Ziganshin, and Georgi M. Mikheev. "DEVELOPMENT OF AN ALGORITHM FOR CREATING A THREE-DIMENSIONAL GRAPH OF THE TOTAL HARMONIC OF VOLTAGE COMPONENTS RATIO." Vestnik Chuvashskogo universiteta, no. 1 (March 25, 2021): 56–67. http://dx.doi.org/10.47026/1810-1909-2021-1-56-67.

Full text

Abstract:

In the power supply system of industrial enterprises with low installed capacity, a battery of cosine capacitors is used as reactive power compensation devices in most cases. However, in certain modes of operation in such a network due to the presence of electrical receivers, which generate the highest harmonics, there may be resonance phenomena. Therefore, in such a network you should know both the presence of harmonic components and their percentage.  It is known that according to GOST 32144-2013 it is necessary to take into account not only the individual harmonic components of

APA, Harvard, Vancouver, ISO, and other styles

22

Jin, Qing Jiang, Zong Tian Liu, and Qiu Hong Xu. "Harmonic Detection and Suppression of Frequency Doubling of Speed Measuring Radar Based on Closed-Loop Gain Control." Advanced Engineering Forum 4 (June 2012): 68–73. http://dx.doi.org/10.4028/www.scientific.net/aef.4.68.

Full text

Abstract:

This paper investigates the problem of frequency doubling with speed measuring radars. The main reason for it is that the gain of the reflected wave receiver cannot cope with all the possible waves reflected by cars of different distances away from the radar. Strong signals will saturate the receiver and generate harmonics which interferes with the speed measuring. Based on this, a harmonic detection and frequency doubling suppression method is developed in this paper and the effectiveness of the method is verified by experimental results.

APA, Harvard, Vancouver, ISO, and other styles

23

ZHANG, G. P. "HIGH HARMONIC GENERATION IN ATOMS, MOLECULES AND NANOSTRUCTURES." International Journal of Modern Physics B 21, no. 31 (2007): 5167–85. http://dx.doi.org/10.1142/s0217979207038253.

Full text

Abstract:

High harmonic generation (HHG) has attracted tremendous attention over two decades. This paper presents a brief review of high harmonic generation in atoms, molecules and nanostructures. Through a simple classical model, we first review a few important concepts in HHG. We then discuss how the electric field initial phase affects the harmonic yield, and explain the reason behind the cutoff law. We focus on HHG in nanostructures. As an example, a detailed calculation in C 60 is presented.

APA, Harvard, Vancouver, ISO, and other styles

24

Zhang, Ming, Jia Ming Wei, Long Xue, and Meng Jun Xu. "The Study in the Application of FFT in Vibroseis Data Harmonic Filtering." Applied Mechanics and Materials 380-384 (August 2013): 3589–94. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.3589.

Full text

Abstract:

This paper studies the thesis of slip-sweep acquisition method in vibroseis exploring. First of all, it briefly describes slip-sweep acquisition in principle, operation and signal processing, compared with the bomb exploring and conventional cascaded sweep acquisition and analyzes the principle of vibroseis exploration in detail. Then the reason why harmonics generated is analyzed. Among the harmonics, high frequency harmonics is most serious. Based on extensive research on the theory and the numerical experiments, the paper assumes that the energy of the high frequency harmonics and that of t

APA, Harvard, Vancouver, ISO, and other styles

25

Huadong, Wang, and Cai Xv. "Carrier Level Layered Modulation Method can Filter Out the Harmonics of Cascaded H - Bridge Topology." Open Electrical & Electronic Engineering Journal 9, no. 1 (2015): 216–24. http://dx.doi.org/10.2174/1874129001409010216.

Full text

Abstract:

Analysis of the reason of cascade H-bridge inverter topology using carrier phase shift modulation method cannot compensate the harmonic, using carrier level layered modulation method can solve the problem of cascade H-bridge topology that it cannot compensate harmonic problems. Experimental results show that the modulation algorithm can effectively reduce the modulation delay, improve the control bandwidth, it can also make the harmonic compensation capacity increase from 5 times to 21. The scope of the application of STATCOM is greatly increased in the grid.

APA, Harvard, Vancouver, ISO, and other styles

26

Albalawi, Hani, Abdul Wadood, Shahbaz Khan, and Aadel Mohammed Alatwi. "Harmonic Mitigation in Multi-Pulse Rectification: A Comparative Study of 12-, 18-, and 24-Pulse Systems." Mathematics 12, no. 20 (2024): 3257. http://dx.doi.org/10.3390/math12203257.

Full text

Abstract:

In the evolution of the modern “More Electric Aircrafts” (MEAs) concept, higher-pulse rectification systems using differential fork autotransformers play a pivotal role. These systems align with the MEAs concept, which aims to replace traditional hydraulic and pneumatic systems with electric alternatives. The reason is that MEAs prioritize weight reduction to enhance fuel efficiency and reduce emissions. Higher-pulse rectifiers achieve this by minimizing losses and optimizing power conversion. Additionally, they mitigate harmonics, ensuring a clean power supply to critical avionic components.

APA, Harvard, Vancouver, ISO, and other styles

27

Wang, Hui, Guo Hu, Shenjian Dai, Cheng Zhou, and Zitao Cao. "Influence Analysis of Photovoltaic Output on Harmonics and Flicker under Extreme Weather Conditions." Journal of Physics: Conference Series 2418, no. 1 (2023): 012026. http://dx.doi.org/10.1088/1742-6596/2418/1/012026.

Full text

Abstract:

Abstract To solve the influence of photovoltaic connected to the station on the power quality of the low-voltage distribution network under extreme weather conditions, the two key points of harmonic and flicker are researched, and the analysis model of harmonic and flicker of the low-voltage distribution network is established according to the characteristics of the low-voltage distribution network in the station area. The characteristics of harmonics and flicker in low-voltage distribution networks with photovoltaic grid-connected inverters as grid-connected interfaces are studied in this pap

APA, Harvard, Vancouver, ISO, and other styles

28

Zajkowski, Konrad, Stanisław Duer, Jacek Paś, and László Pokorádi. "Cooperation of a Non-Linear Receiver with a Three-Phase Power Grid." Energies 16, no. 3 (2023): 1418. http://dx.doi.org/10.3390/en16031418.

Full text

Abstract:

This article presents an analysis of electrical parameters in a three-phase circuit characterized by the generation of harmonics. The Currents Physical Components (CPC) power theory for three-phase circuits were used. Relationships for three-wire circuits were used, and mathematical relationships were determined to enable decomposition into those components that depend on the direction of energy flow and the reasons for their creation. A calculation example using the previously determined dependencies was presented, and the results of the calculations were discussed. When mathematical analyses

APA, Harvard, Vancouver, ISO, and other styles

29

Yu, Fei, and Yongchao Zhou. "A Novel Vector Control of Five-phase PMSM Based on Harmonic Current Closed Loop." MATEC Web of Conferences 232 (2018): 04015. http://dx.doi.org/10.1051/matecconf/201823204015.

Full text

Abstract:

Multi-phase electric machines such as five-phase permanent magnet synchronous motor (PMSM) play an important role in the ships electrical propulsion because of the advantages of high performance and high reliability. The decoupled mathematic models of five-phase PMSM in dq coordinate frame are established, and the reason caused to high stator harmonic current in the multi-phase motor is analyzed based on the mathematic models. To suppress the harmonic current, a novel vector control (VC) method based on SVPWM and harmonic current closed loop control is proposed. Based on the proposed algorithm

APA, Harvard, Vancouver, ISO, and other styles

30

Chau, Minh Thuyen. "Adaptive Current Control Method for Hybrid Active Power Filter." Journal of Electrical Engineering 67, no. 5 (2016): 343–50. http://dx.doi.org/10.1515/jee-2016-0049.

Full text

Abstract:

AbstractThis paper proposes an adaptive current control method for Hybrid Active Power Filter (HAPF). It consists of a fuzzy-neural controller, identification and prediction model and cost function. The fuzzy-neural controller parameters are adjusted according to the cost function minimum criteria. For this reason, the proposed control method has a capability on-line control clings to variation of the load harmonic currents. Compared to the single fuzzy logic control method, the proposed control method shows the advantages of better dynamic response, compensation error in steady-state is small

APA, Harvard, Vancouver, ISO, and other styles

31

VILLORESI, P. "On the optical analysis of the ray path-lengths in the diffraction of femtosecond XUV and soft X-ray pulses." Laser and Particle Beams 18, no. 3 (2000): 529–34. http://dx.doi.org/10.1017/s0263034600183259.

Full text

Abstract:

During the diffraction of a femtosecond pulse with a grating, apart spectral filtering, there occurs a time stretching due to the difference in the path length among the rays diffracted, even of equal wavelength. The reason resides in the action of the grating: to depart from the behavior of the mirror, that is, α = β, and to direct the rays in directions whose paths are groove-by-groove different of mλ. The compensation of this broadening is studied in the following by using a pair of grating in a particular mounting. The configuration is studied for the application in the selection of one si

APA, Harvard, Vancouver, ISO, and other styles

32

Lee, Kuang Chyi, Kuang Chih Li, Hsin Her Yu, and Chien Chang Lin. "Forced Response of Harmonic Mistuned Blade Disks." Key Engineering Materials 324-325 (November 2006): 145–48. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.145.

Full text

Abstract:

In this paper, by adopting the continuous ring model and the perturbation analysis for free vibration, the authors showed the reason and the importance for the modes split phenomena and provided the qualitative relation between modes split and perturbation for the harmonic number of stiffness perturbation. Also through the modal analysis for forced vibration the authors showed possible ways to predict and prevent the worst case when blade will crack. That is, the harmonic number for stiffness distribution should be avoided to be twice the engine order.

APA, Harvard, Vancouver, ISO, and other styles

33

Wei, Bin. "Synchronization Analysis of Christiaan Huygens’ Coupled Pendulums." Axioms 12, no. 9 (2023): 869. http://dx.doi.org/10.3390/axioms12090869.

Full text

Abstract:

This paper discovers a new finding regarding Christiaan Huygens’ coupled pendulums. The reason Christiaan Huygens’ coupled pendulums obtain synchrony is that the coupled pendulums are subject to a harmonic forcing. As the coupled pendulums swing back and forth, they generate a harmonic force, which, in turn drives the coupled pendulums, such that the two pendulums swing in synchrony once the angular frequency of the generated harmonic forcing satisfies a certain condition. The factor that determines the angular frequency of the generated harmonic forcing is the effective length of the pendulum

APA, Harvard, Vancouver, ISO, and other styles

34

Gołębiowski, Lesław, Marek Gołębiowski, Damian Mazur, and Matthias Humer. "The gearless, grid-connected, 6-phase asymmetric wind turbine generator system." Archives of Electrical Engineering 64, no. 3 (2015): 391–403. http://dx.doi.org/10.2478/aee-2015-0031.

Full text

Abstract:

Abstract In this paper a system of a grid side and a generator side converters, both working with a common capacitor, is presented. The 6-phase asymmetric inset-type SMPMSM generator is used. A large pole pair number of this generator enables a gearless wind turbine operation. The fundamental and 3rd harmonic cooperation is used to increase the generator performance. This is accomplished by means of the 3rd harmonic current injection. For that reason the generator side converter must have a neutral connection.

APA, Harvard, Vancouver, ISO, and other styles

35

Akay, Ali, and Paul Lefley. "Torque Ripple Reduction Method in a Multiphase PM Machine for No-Fault and Open-Circuit Fault-Tolerant Conditions." Energies 14, no. 9 (2021): 2615. http://dx.doi.org/10.3390/en14092615.

Full text

Abstract:

This paper presents a method that has been developed to reduce the torque ripples under healthy and open-circuit fault-tolerant (OCFT) conditions for a multiphase permanent magnet (PM) machine. For smooth torque, both the phase current and the back electromotive force (back-EMF) should be purely sinusoidal. To improve the torque in a multiphase machine, higher-order current harmonics are injected, which are related to the harmonics in the back-EMF. For this reason, generally, multiphase machines are designed with higher-order back-EMF harmonics. However, these harmonics produce ripples in the

APA, Harvard, Vancouver, ISO, and other styles

36

Shrivastava, Nitisha, and Arjun Baliyan. "Modelling and validation of hybrid series active filter for power quality enhancement using OPAL-RT simulator." International Journal of Electrical and Computer Engineering (IJECE) 15, no. 2 (2025): 1274. https://doi.org/10.11591/ijece.v15i2.pp1274-1288.

Full text

Abstract:

It is a known fact that the quality of power is degrading at a very fast rate. The reason behind this is harmonics in the power supply. The main motive is to reduce the harmonic pollution in the system for various combinations of the load. The method proposed in this paper consists of hybrid series active power filter (HSAPF) which is a combination of an active power filter connected in series and the passive filter in parallel with the load. In order to generate the compensating signals, synchronous reference method has been used and the tuning of the proportional integral (PI) controller is

APA, Harvard, Vancouver, ISO, and other styles

37

Cheng, Ru Qi, Yao Zhao, Geng Shen Zhao, and Zhi Hua Zha. "Research on Main-Line Voltage Fluctuation of Z-Source Inverter." Advanced Materials Research 430-432 (January 2012): 1273–76. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1273.

Full text

Abstract:

Z-source inverter main-line voltage has a fluctuation and its frequency is same with the second harmonic of output sine wave, it will increase the second harmonic content of output which affecting the performance of the inverter. Introduced the topology and control method of Z-source inverter. By modeling the Z-source inverter, analyzed the reason of DC voltage fluctuation. Proposed the method to weak the fluctuation based on circuit design. By Comparing the simulation results of main-line voltage under various circuit parameters, verified the effectiveness of this method.

APA, Harvard, Vancouver, ISO, and other styles

38

Adelson, Ronald M., and Adrian C. Turner. "Spectrum Analysis, Aliasing, and the Perception of Musical Tones." Perception 25, no. 5 (1996): 609–17. http://dx.doi.org/10.1068/p250609.

Full text

Abstract:

A signal-processing model is proposed in which the phenomenon of ‘aliasing’ is invoked to explain certain phenomena in the perception of musical tones, for which a really satisfactory explanation has not hitherto been available. It is shown that this model offers a reason why the harmonic series appears to play such a central role in tone and pitch perception, and can throw light on ‘virtual pitch’, ‘harmonic beats’, etc. Some preliminary results from a computer simulation of the model are described which are consistent with empirical data on tone perception.

APA, Harvard, Vancouver, ISO, and other styles

39

KIM, MIN-SU, JUNG JIN JU, SEUNG KOO PARK, JUNG YUN DO, and MYUNG-HYUN LEE. "ABSORPTION EFFECTS ON SECOND-HARMONIC GENERATION AND CASCADED WAVELENGTH CONVERSION IN NONLINEAR OPTICAL POLYMERS." Journal of Nonlinear Optical Physics & Materials 13, no. 03n04 (2004): 367–71. http://dx.doi.org/10.1142/s0218863504002006.

Full text

Abstract:

Although nonlinear optical (NLO) polymers often exhibit very high optical nonlinearities, they have barely been applied to tentative NLO devices. The main reason lies in their high absorption losses, and this fundamental trade-off between optical nonlinearity and absorption, stems further advancement. Our theoretical analyses inform us that absorption effect is much less critical in cascaded wavelength conversion (CWC) than in second-harmonic generation (SHG), especially when absorption loss is very high at a given second-harmonic wavelength. Based on this result, we propose CWC as a more prac

APA, Harvard, Vancouver, ISO, and other styles

40

Arjun Joshi, Gaganambha, Dharshan B G, et al. "Comparative analysis of Dynamic Voltage Restorer based on PI and ANN Control strategies in order to improve the voltage quality under Non-linear loads." World Journal of Advanced Research and Reviews 22, no. 3 (2024): 292–303. http://dx.doi.org/10.30574/wjarr.2024.22.3.1706.

Full text

Abstract:

Voltage sag, swell and harmonic distortion are the key power quality concerns addressed by the distribution network. The presence of non-linear loads and renewable energy sources like solar, wind etc. is the reason for power quality issues. These necessitates the need for the development of a power quality conditioner to compensate the effects of these power quality problems. Hence a Dynamic Voltage Restorer is developed and deployed to improve power quality by decreasing harmonics and adjusting for voltage swell and sag. DVR control is achieved by regulating the load voltage under a variety o

APA, Harvard, Vancouver, ISO, and other styles

41

Arjun, Joshi, Gaganambha, B. G. Dharshan, et al. "Comparative analysis of Dynamic Voltage Restorer based on PI and ANN Control strategies in order to improve the voltage quality under Non-linear loads." World Journal of Advanced Research and Reviews 22, no. 3 (2024): 292–303. https://doi.org/10.5281/zenodo.14725906.

Full text

Abstract:

Voltage sag, swell and harmonic distortion are the key power quality concerns addressed by the distribution network. The presence of non-linear loads and renewable energy sources like solar, wind etc. is the reason for power quality issues. These necessitates the need for the development of a power quality conditioner to compensate the effects of these power quality problems. Hence a Dynamic Voltage Restorer is developed and deployed to improve power quality by decreasing harmonics and adjusting for voltage swell and sag. DVR control is achieved by regulating the load voltage under a variety o

APA, Harvard, Vancouver, ISO, and other styles

42

Xie, Lingling, and Di Wan. "Modeling and Harmonic Analysis of a Fractional-Order Zeta Converter." Energies 16, no. 9 (2023): 3969. http://dx.doi.org/10.3390/en16093969.

Full text

Abstract:

The Zeta converter is an essential and widely used high-order converter. The current modeling studies on Zeta converters are based on the model that devices, such as capacitors and inductors, are of integer order. For this reason, this paper takes the Zeta converter as the research object and conducts an in-depth study on its fractional-order modeling. However, the existing modeling and analysis methods have high computational complexity, the analytical solutions of system variables are tedious, and it is difficult to describe the ripple changes of state variables. This paper combines the prin

APA, Harvard, Vancouver, ISO, and other styles

43

Shrivastava, Nitisha, and Arjun Baliyan. "Modelling and validation of hybrid series active filter for power quality enhancement using OPAL-RT simulator." International Journal of Electrical and Computer Engineering (IJECE) 15, no. 2 (2025): 1274–88. https://doi.org/10.11591/ijece.v15i2.pp1274-1288.

Full text

Abstract:

It is a known fact that the quality of power is degrading at a very fast rate. The reason behind this is harmonics in the power supply. The main motive is to reduce the harmonic pollution in the system for various combinations of the load. The method proposed in this paper consists of hybrid series active power filter (HSAPF) which is a combination of an active power filter connected in series and the passive filter in parallel with the load. In order to generate the compensating signals, synchronous reference method has been used and the tuning of the propor

APA, Harvard, Vancouver, ISO, and other styles

44

Rector, Michael. "Harmonic Parenthesis in Early Chopin." Context, no. 49 (2024): 1–31. http://dx.doi.org/10.46580/cx56246.

Full text

Abstract:

In a well-known journal entry—from April 1849, the year of Chopin’s death—Delacroix describes a day spent with the composer saying, ‘he talked to me about music, and it revived him.’ The journal makes the two men appear intensely sympathetic. Delacroix relates an artistic credo that he attributes to Chopin, but could equally apply to himself: ‘[Art] is reason itself, adorned by genius, but following a necessary path and contained by higher laws.’ In contrast to contemporary critics, who tended to emphasize Delacroix’s use of colour and loose brushwork to label him ‘romantic’, the painter thoug

APA, Harvard, Vancouver, ISO, and other styles

45

Wang, Kai Liang, and Jiang Zeng. "Optimal Design of Passive Filter Groups Based on Three Kinds of Operation Modes." Applied Mechanics and Materials 392 (September 2013): 611–17. http://dx.doi.org/10.4028/www.scientific.net/amm.392.611.

Full text

Abstract:

Parameters of passive filter (PF) group are usually designed according to single operating mode, in general the maximum operation mode. When power system is being operated in other operation mode, it is impossible to meet the requirement of power system in reactive power compensation and harmonic elimination simultaneously when whichever filter group is out of service. For this reason, based on three kinds of typical operation mode, namely the maximum, average and minimum mode, the optimization design of PF group is performed and reasonable parameters are determined to achieve the optimal matc

APA, Harvard, Vancouver, ISO, and other styles

46

Pidgayko, Dmitry, Ilya Deriy, Vladimir Fedorov, et al. "Second harmonic generation in hybrid GaP/Au nanocylinders." Journal of Physics: Conference Series 2015, no. 1 (2021): 012172. http://dx.doi.org/10.1088/1742-6596/2015/1/012172.

Full text

Abstract:

Abstract To date, nanoscale dielectric and plasmonic systems with a nonlinear response are of great interest to researchers. This is due to a wide range of their potential applications in nonlinear optical converters and optical communication systems. The fundamental problem of nanoscale frequency converters is the low efficiency of nonlinear optical generation. The reason for this is that the main mechanism for increasing the efficiency of nonlinear signal generation via phase matching is not available at scales smaller than the wavelength. Here, we experimentally investigate the generation o

APA, Harvard, Vancouver, ISO, and other styles

47

Chigira, Koji, Yoshinori Ando, Iwanori Murakami, and Takahito Kurahashi. "Study on Structure for Increase of a Transmit Torque on Magnetic Harmonic Gear with Stackable Structure." Materials Science Forum 915 (March 2018): 77–82. http://dx.doi.org/10.4028/www.scientific.net/msf.915.77.

Full text

Abstract:

The magnetic harmonic gear has been studied because of its high magnet use efficiency. However the magnetic harmonic gears are difficult to assemble. So, a new type of the magnetic harmonic gear was proposed. This magnetic gear has the stackable structure and is assembled easily. Thus far, it was studied its characteristics. In this study, we readjust its structure to step up its maximum transmit torque. The magnetic gear has parts which is constituted an iron plate and a segment magnet. In the past, it has never studied the ratio of iron to magnet. Therefore, we analyze the effect when they a

APA, Harvard, Vancouver, ISO, and other styles

48

Breaz, Daniel, Abdullah Durmuş, Sibel Yalçın, Luminita-Ioana Cotirla, and Hasan Bayram. "Certain Properties of Harmonic Functions Defined by a Second-Order Differential Inequality." Mathematics 11, no. 19 (2023): 4039. http://dx.doi.org/10.3390/math11194039.

Full text

Abstract:

The Theory of Complex Functions has been studied by many scientists and its application area has become a very wide subject. Harmonic functions play a crucial role in various fields of mathematics, physics, engineering, and other scientific disciplines. Of course, the main reason for maintaining this popularity is that it has an interdisciplinary field of application. This makes this subject important not only for those who work in pure mathematics, but also in fields with a deep-rooted history, such as engineering, physics, and software development. In this study, we will examine a subclass o

APA, Harvard, Vancouver, ISO, and other styles

49

Jaswini Sarwade, Te, V. S. Jape, and D. G. Bharadwaj. "Power quality problems mitigation using dynamic voltage restorer (DVR) with pi controller and fuzzy logic controller." International Journal of Engineering & Technology 7, no. 2.12 (2018): 214. http://dx.doi.org/10.14419/ijet.v7i2.12.11282.

Full text

Abstract:

The existence of non-standard currents, frequencies and voltages enhances the Power Quality (PQ) problems. Power consumed by the consumers and losses occurred in power system are deciding factors for the utility to determine the performance of the power system in terms of Power Quality. These Power Quality problems lead to failure of end user equipments as well as creates disturbances in power distribution network, thereby deteriorates residual life assessment of major equipments used in substation. The PQ problems can be characterized as voltage surges, sags, swells, harmonic distortions, etc

APA, Harvard, Vancouver, ISO, and other styles

50

Sreedhar, T., and K. Udhayakumar. "Negative Harmonics Injection Cuddled Equal Area Criteria Based Selective Harmonic Elimination Pulse Width Modulation Techniques for Multilevel Cascaded Inverters." Journal of Computational and Theoretical Nanoscience 13, no. 10 (2016): 7564–73. http://dx.doi.org/10.1166/jctn.2016.5754.

Full text

Abstract:

Selective Harmonics Elimination (SHE) technique of power electronic converters can be generally defined as calculation of the optimized switching angles at any desired output (fundamental) voltage component to eliminate a set of preferred lower order harmonic components. This low switching frequency method adds values to Multilevel Inverter (MLI) based systems for the reason that MLI’s have the ability to synthesize waveforms closer to sinusoidal with a better harmonics spectrum. The traditional method for finding the optimized switching angles is by solving the Fourier non-linear transcendent

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!