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Journal articles on the topic 'Power correction'

Author: Grafiati

Published: 9 March 2023

Last updated: 10 March 2023

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1

Zhang, Dongying, Ting Du, Hao Yin, Shiwei Xia, and Huiting Zhang. "Multi-Time-Scale Coordinated Operation of a Combined System with Wind-Solar-Thermal-Hydro Power and Battery Units." Applied Sciences 9, no. 17 (September 1, 2019): 3574. http://dx.doi.org/10.3390/app9173574.

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The grid connection of intermittent energy sources such as wind power and photovoltaic power generation brings new challenges for the economic and safe operation of renewable power systems. To address these challenges, a multi-time-scale active power coordinated operation method, consisting of day-ahead scheduling, hour-level rolling corrective scheduling, and real-time corrective scheduling, is proposed for the combined operation of wind-photovoltaic-thermal-hydro power and battery (WPTHB) to handle renewable power fluctuations. In day-ahead scheduling, the optimal power outputs of thermal power units, hydro-pumped storage units, and batteries are solved with the purpose of minimizing the total power generation cost. In hour-level rolling corrective scheduling, the power output plan of thermal power units and pumped storage units is modified to minimize the correction cost based on the on-off state of thermal power units determined in day-ahead scheduling. In real-time corrective scheduling stage, the feedback correction and rolling optimization-based model predictive control algorithm is adopted to modify the power output of thermal power units, hydro-pumped storage units, and batteries optimized in hour-level rolling correction scheduling, so as to ensure the economy of the correction plan and the static security of system operation. Finally, simulation results demonstrated that the proposed method can accurately track system power fluctuations, and ensure the economic and security operation of a multi-energy-generation system.

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2

Karasinskiy, O. L., and Yu F. Tesyk. "CORRECTION OF ERRORS IN INSTRUMENTS FOR MEASURING ELECTRIC POWER PARAMETERS." Tekhnichna Elektrodynamika 2021, no. 2 (February 23, 2021): 84–90. http://dx.doi.org/10.15407/techned2021.02.084.

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A study of methods for correcting amplitude and phase errors in devices for measuring the parameters of electric power with digital signal processing with a sampling frequency multiple of the network frequency was made. The generalized flow diagram of measuring device that consists of a few entrance channels was presented. Mathematical expositions that explain the process of correction of additive and multiplicative errors are given. Through a temporal diagram a few variants of encoding of entrance signals are shown. The possibility of correcting phase errors by shifting the moment of the ADC start-up and by turning the axes and transforming the coordinates of the voltage and current vectors is shown. The possibility of correction when measuring the reactive and reactive powers is investigated. Referencese 11, table 1, figures 5.

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3

Rajicic, D., R. Ackovski, and R. Taleski. "Voltage correction power flow." IEEE Transactions on Power Delivery 9, no. 2 (April 1994): 1056–62. http://dx.doi.org/10.1109/61.296308.

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4

Saied, M. M. "Optimal power factor correction." IEEE Transactions on Power Systems 3, no. 3 (1988): 844–51. http://dx.doi.org/10.1109/59.14531.

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5

Shubbar, Mafaz M., Laith A. Abdul-Rahaim, and Ahmed A. Hamad. "Cloud-Based Automated Power Factor Correction and Power Monitoring." Mathematical Modelling of Engineering Problems 8, no. 5 (October 31, 2021): 757–62. http://dx.doi.org/10.18280/mmep.080510.

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Energetic life-sustaining needs, such as electrical power, are essential for everyday existence. It is commonly used in residential, industrial, farming, and medical facilities. Life without energy is minimal. Despite the vital need for electricity demand, losses curtailments and additional energy bills are still problems. Power factor correction is a method to fix or minimize mentioned problems. Automated power factor correction (APFC) will precede good contrivance for correction. Several studies on established systems endeavoured to improve power factor via local calculation and correction, android application, or web monitoring with disparity results and node types. The purpose of this treatise is to suggest a neoteric cloud APFC with neural network design advances to recent designs of APFC that depend on IoT and cloud. This design used a private cloud utilizing raspberry pi and a neural network to correct the power factor of homes in a single algorithm, and cloud helping in hosting and accessed on-demand at any time and from everywhere as long as the Internet is accessible and the neural for determining the capacitance value for power factor correction. In addition, this design will minimize devices used, give precise results, minimize the cost of the bill and make the easy utility monitoring of the power factor before and after correction.

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6

Ren, Yaming, Shumin Fei, and Haikun Wei. "Prediction-Correction Alternating Direction Method for Power Systems Economic Dispatch." International Journal of Computer and Electrical Engineering 7, no. 3 (2015): 179–88. http://dx.doi.org/10.17706/ijcee.2015.7.3.179-188.

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7

Ornatskyi, D. P., S. V. Ehorov, and V. V. Dovhan. "CORRECTION OF ERRORS OF THE MEASURING CHANNEL AVERAGE ACTIVE POWER." Tekhnichna Elektrodynamika 2022, no. 1 (January 24, 2022): 75–81. http://dx.doi.org/10.15407/techned2022.01.075.

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In the article is offered the structural scheme of error correction of the precision measuring channel of average active power for researches in laboratory conditions and exclusively within the limits of changes of the basic frequency of a network. A feature of the scheme is the use of calibration of functional transducers with piecewise linear approximation. The input voltages of these converters are a triangular voltage, which is formed at the output of the integrator by integrating rectangular bipolar meanders, which are formed from the output signals of the frequency divider phase shifter synchronized with the network by a device based on the original precision amplitude-pulse system of phase frequency tuning. Compensatory small-sized low-voltage transformers using measuring amplifiers with differentially split inputs are used as primary converters, which increases the linearity of the characteristic in a wide dynamic range, due to which additive-multiplicative correction of errors of the whole measuring path by two points is realized. The article presents the results of computer modeling of the main functional components of the measuring channel, which confirm its precision and high metrological characteristics. References 10, Figures 2.

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8

Mathioudakis, K. "Gas Turbine Test Parameters Corrections Including Operation With Water Injection." Journal of Engineering for Gas Turbines and Power 126, no. 2 (April 1, 2004): 334–41. http://dx.doi.org/10.1115/1.1691443.

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Methods for correcting data from gas turbine acceptance testing are discussed, focusing on matters which are not sufficiently covered by existing standards. First a brief outline is presented of the reasoning on which correction curves are based. Typical performance correction curves are shown together with the method of calculating mass flow rate and turbine inlet temperature from test data. A procedure for verifying guarantee data at a specific operating point is then given. Operation with water injection is then considered. Ways of correcting performance data are proposed, and the reasoning of following such a procedure is discussed. Corrections for water amount as well as power and efficiency are discussed. Data from actual gas turbine testing are used to demonstrate how the proposed procedure can be applied in actual cases of acceptance testing.

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9

Feng, Zhao Hong, Tie Jun Jia, Xi Ming Xiao, and Fu Jie Zhang. "Wind Power Allocation Based on Predictive Power Correction." Applied Mechanics and Materials 644-650 (September 2014): 3445–48. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.3445.

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Wind power prediction techniques can be used in wind power scheduling control. Aim at the scheduling control deviation caused by the error between predicted power and actual power output, a Wind power scheduling optimization allocation algorithm based on predictive power correction is proposed, which adopts Auxiliary Particle Filter Algorithm to adjust the values of predicted wind power .Then the adjusted values are used in the proportional allocation according to the maximum power strategy ,and the superiority of this method will be verified by MATLAB simulation with the real wind farm operating data .

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10

Schlecht, Martin F., and Brett A. Miwa. "Active Power Factor Correction for Switching Power Supplies." IEEE Transactions on Power Electronics PE-2, no. 4 (October 1987): 273–81. http://dx.doi.org/10.1109/tpel.1987.4307862.

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11

R, Rohith, and Saji A J. "BCH Encoder and Decoder for Emerging Memories." December 2020 2, no. 4 (January 19, 2021): 220–27. http://dx.doi.org/10.36548/jei.2020.4.004.

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In this paper, an encoder and decoder system is proposed using Bose-Chaudhuri-Hocquenghem (BCH) double-error-correcting and triple-error detecting (DEC-TED) with emerging memories of low power and high decoding efficiency. An adaptive error correction technique and an invalid transition inhibition technique is enforced to the decoder. This is to improve the decoding efficiency and reduce the power consumption and delay. The adaptive error correction gives high decoding efficiency and invalid transition technique reduce the power consumption issue in conventional BCH decoders. The DEC-TED BCH decoder combines these two techniques by using a specific Error Correcting Code Clock and Flip Flops. This technique provides an error correcting encoder and decoder solution for low power and high-performance application using emerging memories. The design simulated in Xilinx FPGA using ISE Design Suite 14.5.

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12

Jardim França, Gleisson, and Braz de Jesus Cardoso Filho. "Series-shunt compensation for harmonic mitigation and dynamic power factor correction." Eletrônica de Potência 17, no. 3 (August 1, 2012): 641–50. http://dx.doi.org/10.18618/rep.2012.3.641650.

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13

Демченко, Ю. С., and В. В. Рогаль. "Methods of power factor correction." Electronics and Communications 18, no. 6 (January 27, 2014): 24–29. http://dx.doi.org/10.20535/2312-1807.2013.18.6.142455.

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14

Chen, Minjie, Sombuddha Chakraborty, and David J. Perreault. "Multitrack Power Factor Correction Architecture." IEEE Transactions on Power Electronics 34, no. 3 (March 2019): 2454–66. http://dx.doi.org/10.1109/tpel.2018.2847284.

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15

Zupiunski, I. Z., L. M. Holicek, and V. V. Vujicic. "Correction to "Power-factor Calibrator"." IEEE Transactions on Instrumentation and Measurement 46, no. 5 (October 1997): 1212. http://dx.doi.org/10.1109/tim.1997.676746.

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16

Ngwe, Thida Win, Soe Winn, and Su Mon Myint. "Design and Control of Automatic Power Factor Correction APFC for Power Factor Improvement in Oakshippin Primary Substation." International Journal of Trend in Scientific Research and Development Volume-2, Issue-5 (August 31, 2018): 2368–72. http://dx.doi.org/10.31142/ijtsrd18320.

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17

LEE, TAEKOON. "THE NATURE OF POWER CORRECTIONS IN LARGE-β0 APPROXIMATION." Modern Physics Letters A 19, no. 31 (October 10, 2004): 2371–76. http://dx.doi.org/10.1142/s0217732304015300.

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We investigate the nature of power corrections and infrared renormalon singularities in large-β0 approximation. We argue that the power correction associated with a renormalon pole singularity should appear at O(1), in contrast to the renormalon ambiguity appearing at O(1/β0), and give an explanation why the leading order renormalon singularities are generically poles.

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18

Hu, Xue Mei, and Guo Tong Zhang. "Correction Technology and Development on Active Power Factor." Advanced Materials Research 424-425 (January 2012): 941–44. http://dx.doi.org/10.4028/www.scientific.net/amr.424-425.941.

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Correction Technology on active power factor is now widely used in AC-DC power supply circuit to eliminate harmonic of power system, to improve the power factor. Firstly the method of power factor correction technology is set out. Secondly, the basic principle of active power factor correction technology is analyzed, then the control method for active power factor correction technology is given. Finally the development trend of active power factor correction technology is analyzed.

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19

Kim, Ji-Man, Jin-Woo Jung, and Han-Jung Song. "The Design of BCM based Power Factor Correction Control IC for LED Applications." Journal of the Korea Academia-Industrial cooperation Society 12, no. 6 (June 30, 2011): 2707–12. http://dx.doi.org/10.5762/kais.2011.12.6.2707.

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20

Ulazia, Alain, Gabriel Ibarra-Berastegi, Jon Sáenz, Sheila Carreno-Madinabeitia, and Santos J. González-Rojí. "Seasonal Correction of Offshore Wind Energy Potential due to Air Density: Case of the Iberian Peninsula." Sustainability 11, no. 13 (July 2, 2019): 3648. http://dx.doi.org/10.3390/su11133648.

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A constant value of air density based on its annual average value at a given location is commonly used for the computation of the annual energy production in wind industry. Thus, the correction required in the estimation of daily, monthly or seasonal wind energy production, due to the use of air density, is ordinarily omitted in existing literature. The general method, based on the implementation of the wind speed’s Weibull distribution over the power curve of the turbine, omits it if the power curve is not corrected according to the air density of the site. In this study, the seasonal variation of air density was shown to be highly relevant for the computation of offshore wind energy potential around the Iberian Peninsula. If the temperature, pressure, and moisture are taken into account, the wind power density and turbine capacity factor corrections derived from these variations are also significant. In order to demonstrate this, the advanced Weather Research and Forecasting mesoscale Model (WRF) using data assimilation was executed in the study area to obtain a spatial representation of these corrections. According to the results, the wind power density, estimated by taking into account the air density correction, exhibits a difference of 8% between summer and winter, compared with that estimated without the density correction. This implies that seasonal capacity factor estimation corrections of up to 1% in percentage points are necessary for wind turbines mainly for summer and winter, due to air density changes.

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21

Abid, Muhammad, Fiaz Ahmad, Farman Ullah, Usman Habib, Saeed Nawaz, Mohsin Iqbal, and Ajmal Farooq. "Correction: High voltage DC power supply with power factor correction based on LLC resonant converter." PLOS ONE 15, no. 12 (December 21, 2020): e0244595. http://dx.doi.org/10.1371/journal.pone.0244595.

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22

Ajith Bosco Raj, T., and R. Ramesh. "Improved Parallel Boost Power Converter for Power Factor Correction." Research Journal of Applied Sciences, Engineering and Technology 7, no. 23 (June 20, 2014): 4986–98. http://dx.doi.org/10.19026/rjaset.7.890.

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23

Sasdelli, Renato, Antonio Menchetti, and Gian Carlo Montanari. "Power definitions for power-factor correction under nonsinusoidal conditions." Measurement 13, no. 4 (July 1994): 289–96. http://dx.doi.org/10.1016/0263-2241(94)90053-1.

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24

Hui, S. Y. R., and H. Chung. "Parallellism of power converters for automatic power factor correction." Electronics Letters 33, no. 15 (1997): 1274. http://dx.doi.org/10.1049/el:19970872.

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25

Hurley, W. G. "The Fundamentals of Power Factor Correction." International Journal of Electrical Engineering & Education 31, no. 3 (July 1994): 213–29. http://dx.doi.org/10.1177/002072099403100303.

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The fundamentals of power factor correction The fundamental issues of power factor analysis for non-sinusoidal waveforms are described. A full-wave rectifier circuit is analysed and original approximations are derived for voltage ripple, peak diode current and input power factor. A power factor correction technique, based on a switching mode power supply, is presented.

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26

Alberto Gallo, Carlos, João Antonio Corrêa Pinto, Luiz Carlos de Freitas, Valdeir José Farias, Ernane Antônio Alves Coelho, and João Batista Vieira Júnior. "A Soft-switched Pwm Interleaved Boost-flyback Converter With Power Factor Correction." Eletrônica de Potência 9, no. 2 (November 1, 2004): 29–35. http://dx.doi.org/10.18618/rep.2004.2.029035.

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27

Alberto Gallo, Carlos, João Antonio Corrêa Pinto, Luiz Carlos de Freitas, Valdeir José Farias, Ernane Antônio Alves Coelho, and João Batista Vieira Júnior. "A Soft-switched Pwm Interleaved Boost-flyback Converter With Power Factor Correction." Eletrônica de Potência 9, no. 2 (November 1, 2004): 29–35. http://dx.doi.org/10.18618/rep.2005.2.029035.

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28

Govorukhin, V. I., and N. E. Unru. "THE POWER DIVIDER-COMBINER WITH ADDITIONAL CAPACITIVE CORRECTION AT THE INPUT OF THE DEVICE." Issues of radio electronics, no. 4 (April 20, 2018): 64–67. http://dx.doi.org/10.21778/2218-5453-2018-4-64-67.

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A sinphase divider-combiner of Wilkinson's power is widely used in practice. However, by the manufacturing of high power dividers, the parasitic capacitance of the ballast resistors begins to affect. The authors proposed an option for additional capacitive correction of parasitic capacitances of ballast resistors, which allows to significantly improve the technical characteristics of the device. A Analytic expressions for the calculating the value of the correcting capacitance are proposed. The quality of the proposed correction method is confirmed by the results of computer modeling.

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29

Liu, Chen Yao, Kuo Bin Liu, and Din Goa Huang. "Design of a Power Transformer for a LLC Resonant Power Converter." Advanced Materials Research 740 (August 2013): 823–29. http://dx.doi.org/10.4028/www.scientific.net/amr.740.823.

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We designed and implemented a power converter to provide a dc power bus for the MCOR 12 correction supply. The characteristics of the dc power bus are variable frequency at both heavy and medium or light loads. These characteristics match the working requirement of the correction supply. The dc power bus has a relaxation oscillator that generates a symmetric triangular waveform, to which MOSFET switching is locked. The frequency of this waveform is related to a voltage to be modulated with feedback circuitry. As a result, the circuit and complex transformer are driven with a half-bridge. We designed the complex resonant transformer and describe in this paper a simulation model that is highly important, thus to exploit its frequency-dependent transfer characteristics. We obtained a power bus with small ripple to provide the correction power. The high-performance characteristics of the resonant dc power bus are illustrated in this paper.

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30

Abelman, Herven, and Shirley Abelman. "Tolerance and Nature of Residual Refraction in Symmetric Power Space as Principal Lens Powers and Meridians Change." Computational and Mathematical Methods in Medicine 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/492383.

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Unacceptable principal powers in well-centred lenses may require a toric over-refraction which differs in nature from the one where correct powers have misplaced meridians. This paper calculates residual (over) refractions and their natures. The magnitude of the power of the over-refraction serves as a general, reliable, real scalar criterion for acceptance or tolerance of lenses whose surface relative curvatures change or whose meridians are rotated and cause powers to differ. Principal powers and meridians of lenses are analogous to eigenvalues and eigenvectors of symmetric matrices, which facilitates the calculation of powers and their residuals. Geometric paths in symmetric power space link intended refractive correction and these carefully chosen, undue refractive corrections. Principal meridians alone vary along an arc of a circle centred at the origin and corresponding powers vary autonomously along select diameters of that circle in symmetric power space. Depending on the path of the power change, residual lenses different from their prescription in principal powers and meridians are pure cross-cylindrical or spherocylindrical in nature. The location of residual power in symmetric dioptric power space and its optical cross-representation characterize the lens that must be added to the compensation to attain the power in the prescription.

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31

Zhou, Yanjun, and Cangtao Yin. "Tunneling corrections on escape rates in different damping systems." International Journal of Modern Physics B 35, no. 11 (April 30, 2021): 2150158. http://dx.doi.org/10.1142/s0217979221501587.

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Tunneling corrections on Kramers escape rates with power-law distribution in three damping systems are obtained separately based on flux over population theory by introducing the tunneling correction into flux. Two common barriers (Eckart barrier and parabolic barrier) are used to calculate tunneling corrections. We take the relevant parameters from the [Formula: see text] reaction to further study how the tunneling correction affects the escape rates in three damping cases. It shows that the tunneling correction has great impact on escape rate in low damping and overdamped systems, but has little impact in low-to-intermediate damping (LID) system. Heretofore, we extend our previous work to a wider range of application areas.

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32

Arya, Deepak. "Automatic Power Factor Correction using Microcontroller." International Journal for Research in Applied Science and Engineering Technology V, no. IV (April 30, 2017): 1325–28. http://dx.doi.org/10.22214/ijraset.2017.4237.

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33

Chalawadi, Vishwanath, and Sanjeeth P. Amminabhavi. "Matlab Simulation for Power Factor Correction." International Journal for Research in Applied Science and Engineering Technology 10, no. 4 (April 30, 2022): 2788–92. http://dx.doi.org/10.22214/ijraset.2022.41905.

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Abstract: Lower in Power Factor of electrical equipments will draws high current from supply power. The effect of this is affected by impedance of electrical equipment. Therefore, the main consideration of this study is how impedance of electrical equipment affects the power factor of electrical loads, and then distributed power as the whole. This study is important to verify the right action to increase low power factor effectively for electrical energy efficiency concern.

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34

Chao, Yang. "Power Factor Correction in Harmonic Environment." Advanced Materials Research 341-342 (September 2011): 821–24. http://dx.doi.org/10.4028/www.scientific.net/amr.341-342.821.

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Harmonics reduces the power factor of power supply system, and thereby reduces the power utilization factor of the power supply system. This paper introduces calculating and correcting of power factor in harmonic environment, and the methods of restraining harmonics.

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35

Agarwal, Prashant, and Divyamohan Gupta. "Review in Power Factor Correction Techniques." INROADS- An International Journal of Jaipur National University 5, no. 1s (2016): 131. http://dx.doi.org/10.5958/2277-4912.2016.00026.6.

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36

V, Naga Siva Rama Murthy. "Micro controller based Power Factor Correction." International Research Journal on Advanced Science Hub 2, Special Issue ICIES 9S (December 17, 2020): 108–15. http://dx.doi.org/10.47392/irjash.2020.170.

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37

Petrov, A. A., and N. I. Shurov. "Hybrid system of power factor correction." IOP Conference Series: Earth and Environmental Science 87 (October 2017): 032031. http://dx.doi.org/10.1088/1755-1315/87/3/032031.

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38

Prasanna Kumar, C. S., S. P. Sabberwal, and A. K. Mukharji. "Power factor measurement and correction techniques." Electric Power Systems Research 32, no. 2 (February 1995): 141–43. http://dx.doi.org/10.1016/0378-7796(94)00906-k.

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Dransfield, Mark, and Yi Zeng. "Airborne gravity gradiometry: Terrain corrections and elevation error." GEOPHYSICS 74, no. 5 (September 2009): I37—I42. http://dx.doi.org/10.1190/1.3170688.

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Terrain corrections for airborne gravity gradiometry data are calculated from a digital elevation model (DEM) grid. The relative proximity of the terrain to the gravity gradiometer and the relative magnitude of the density contrast often result in a terrain correction that is larger than the geologic signal of interest in resource exploration. Residual errors in the terrain correction can lead to errors in data interpretation. Such errors may emerge from a DEM that is too coarsely sampled, errors in the density assumed in the calculations, elevation errors in the DEM, or navigation errors in the aircraft position. Simple mathematical terrains lead to the heuristic proposition that terrain-correction errors from elevation errors in the DEM are linear in the elevation error but follow an inverse power law in the ground clearance of the aircraft. Simulations of the effect of elevation error on terrain-correction error over four measured DEMs support this proposition. This power-law relation may be used in selecting an optimum survey flying height over a known terrain, given a desired terrain-correction error.

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40

Bogdan, Antoni. "Modeling of the AC/HF/DC converter with power factor correction." Archives of Electrical Engineering 59, no. 3-4 (December 1, 2010): 141–52. http://dx.doi.org/10.2478/s10171-010-0011-2.

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Modeling of theAC/HF/DCconverter with power factor correctionIn this paper, the power factor correction system consisted of: bridge converter, parallel resonant circuit, high frequency transformer, diode rectifier andLFCFfilter is presented. This system is controlled by a pulse density modulation method and the principle of its operation is based on the boost technique. The modeling approach is illustrated by an example usingAC/HF/DCconverter. Verification of the derived model is provided, which demonstrated the validity of the proposed approach.

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41

Chyzhenko, O. I., and I. V. Blinov. "DEVICE FOR CORRECTING THE LINE VOLTAGE WAVEFORM THAT FEEDS A HIGH-POWER CON-TROLLED RECTIFIER." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini, no. 61 (May 25, 2022): 37–43. http://dx.doi.org/10.15407/publishing2022.61.037.

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A circuit solution of a device for correcting the waveform of the mains voltage, which feeds a controlled semiconductor rectifier of comparable power, is proposed. The sags and swells in the mains phase voltage, which occur during current switching from one phase to another, are compensated by correction pulses, which are transformed into these phases from the phase, which is not involved in switching, using transformers. The mains phase voltage correction circuit, which generates the correction pulses, is connected to the rectifier by four groups of gates in each phase. These groups contain two counter-parallel controlled thyristors, which connect the rectifier to the network phases and its neutral conductor. An algorithm for controlling the controlled thyristors is described. Ref. 8, fig. 2.

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42

Hagiwara, Yoshiyasu, Atsuhiko Nishio, Kazuaki Yuuki, Akihiko Ujiie, and Eimei Takahara. "A Study of Power Factor Correction for Shinkansen Power Converters." IEEJ Transactions on Industry Applications 119, no. 5 (1999): 609–16. http://dx.doi.org/10.1541/ieejias.119.609.

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43

K V, Bindu, and B. Justus Rabi. "A Novel Power Factor Correction Rectifier for Enhancing Power Quality." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 4 (December 1, 2015): 772. http://dx.doi.org/10.11591/ijpeds.v6.i4.pp772-780.

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In this paper, the disturbances in power system due to low quality of power are discussed and a current injection method to maintain the sinusoidal input current which will reduce the total current harmonic distortion (THD) as well as improve the power factor nearer to unity is proposed. The proposed method makes use of a novel controlled diode rectifier which involves the use of bidirectional switches across the front-end rectifier and the operation of the converter is fully analyzed. The main feature of the topology is low cost, small size, high efficiency and simplicity, and is excellent for retrofitting front-end rectifier of existing ac drives, UPS etc. A novel strategy implementing reference compensation current depending on the load harmonics and a control algorithm for three-phase three-level unity PF rectifier which draws high quality sinusoidal supply currents and maintains good dc link- voltage regulation under wide load variation. The proposed technique can be applied as a retrofit to a variety of existing thyristor converters which uses three bidirectional switches operating at low frequency and a half-bridge inverter operating at high frequency .The total power delivered to the load is processed by the injection network, the proposed converter offers high efficiency and not only high power factor but also the Total Harmonic Distortion is reduced. Theoretical analysis is verified by digital simulation and a hardware proto type module is implemented in order to confirm the feasibility of the proposed system. This scheme in general is suitable for the common variable medium-to high-power level DC load applications.

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Newsom, R. L., W. C. Dillard, and R. M. Nelms. "Digital power-factor correction for a capacitor-charging power supply." IEEE Transactions on Industrial Electronics 49, no. 5 (October 2002): 1146–53. http://dx.doi.org/10.1109/tie.2002.803240.

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Hui, S. Y., Henry Shu-Hung Chung, and Siu-Chung Yip. "A bidirectional AC-DC power converter with power factor correction." IEEE Transactions on Power Electronics 15, no. 5 (September 2000): 942–48. http://dx.doi.org/10.1109/63.867684.

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Coman, Ciprian Mihai, Adriana Florescu, and Constantin Daniel Oancea. "Improving the Efficiency and Sustainability of Power Systems Using Distributed Power Factor Correction Methods." Sustainability 12, no. 8 (April 13, 2020): 3134. http://dx.doi.org/10.3390/su12083134.

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For the equipment connected to the three-phase or single-phase grid, the power factor represents an efficiency measure for the usage of electrical energy. The power factor improvement through correction methods reduces the load on the transformers and power conductors, leading to a reduction of losses in the mains power supply and a sustainable grid system. The implications at the financial level are also important. An example of load that generates a small power factor is represented by a motor without mechanical load or having a small mechanical load. Given the power factor correction (PFC), the costs are reduced through the elimination of penalties, applying only in the common coupling point (CCP). The advantages of using equipment for the power factor correction are related also to their long operation duration and the easiness of their installation. The device presented in this article takes advantage of the advances in information and communication technology (ICT) to create a new approach for telemetry and remote configuration of a PFC. This approach has flexibility and versatility, such that it can be adapted to many loads, easily changing the capacitance steps and settings of the power factor correction device.

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Roh, Yong-Seong, and Changsik Yoo. "A Continuous Conduction mode/Critical Conduction Mode Active Power Factor Correction Circuit with Input Voltage Sensor-less Control." Journal of the Institute of Electronics and Information Engineers 50, no. 8 (August 15, 2013): 151–61. http://dx.doi.org/10.5573/ieek.2013.50.8.151.

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Tadeu Galelli, Marcos, Márcio da Silva Vilela, Ernane Antônio Alves Coelho, João Batista Vieira Júnior, João Carlos de Oliveira, Luiz Carlos de Freitas, and Valdeir José Farias. "Proposal Of A Timer Controller With Constant Switching Frequency And Power Factor Correction." Eletrônica de Potência 11, no. 2 (July 1, 2006): 119–26. http://dx.doi.org/10.18618/rep.2006.2.119126.

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Meyer Forsting, Alexander R., Georg R. Pirrung, and Néstor Ramos-García. "Brief communication: A fast vortex-based smearing correction for the actuator line." Wind Energy Science 5, no. 1 (March 23, 2020): 349–53. http://dx.doi.org/10.5194/wes-5-349-2020.

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Abstract. The actuator line is a lifting line representation of aerodynamic surfaces in computational fluid dynamics applications but with non-singular forces, which reduces the self-induced velocities at the line. The vortex-based correction by Meyer Forsting et al. (2019a) recovers this missing induction and thus the intended lifting line behaviour of the actuator line. However, its computational cost exceeds that of existing tip corrections and quickly grows with blade discretization. Here we present different methods for reducing its computational cost to the level of existing corrections without jeopardizing the stability or accuracy of the original method. The cost is reduced by at least 98 %, whereas the power is maximally affected by 0.8 % with respect to the original formulation. This accelerated smearing correction remains a dynamic correction by modelling the variation in trailed vorticity over time. The correction is openly available (Meyer Forsting et al., 2019b).

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Hjort, Søren. "Non-Empirical BEM Corrections Relating to Angular and Axial Momentum Conservation." Energies 12, no. 2 (January 20, 2019): 320. http://dx.doi.org/10.3390/en12020320.

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The Blade-Element Momentum (BEM) model for Horizontal-Axis Wind Turbines (HAWTs), although extremely useful, is known to be approximate due to model formulation insufficiencies, for which add-ons and corrections have been formulated over the past many decades. Scrutiny of the axial and azimuthal momentum conservation properties reveals momentum simplifications and absence of momentum sources not included in momentum theory underlying the standard BEM. One aspect relates to azimuthal momentum conservation, the wake swirl. This correction can be expressed analytically. Another aspect relates to axial momentum conservation, the wake expansion. This correction is not analytically quantifiable. The latter correction term is therefore quantified from postprocessing a large number of axisymmetric Actuator Disk (AD) Navier-Stokes computations with systematic variation of disk loading and tip-speed ratio. The new momentum correction terms are then included in the BEM model, and results benchmarked against references. The corrected BEM is derived by re-visiting the governing equations. For a disk represented by a constant-circulation set of blades, the corrected BEM contains no approximation to the underlying conservation laws. The study contributes by bridging the gap between BEM and the axisymmetric AD method for all disk load levels and tip speed ratios relevant for a wind turbine. The wake swirl correction leads to higher power efficiency at lower tip-speed ratios. The wake expansion correction causes a redistribution of the potential for power extraction, which increases on the inner part of the rotor and decreases on the outer part of the rotor. The overall rotor-averaged value of Betz limit is unaffected by the new corrections, but exceeding Betz locally on the inner- and mid-section of the rotor is shown to be possible. The two corrections significantly improve the axi-symmetric static BEM modelling accuracy for the radial distributions as well as for the rotor-integrated quantities, by reducing errors, approximately one order of magnitude. The relevance of these corrections for modern multi-MW rotors is quantified and discussed.

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