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Littérature scientifique sur le sujet « Power correction »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Power correction"

Zhang, Dongying, Ting Du, Hao Yin, Shiwei Xia et Huiting Zhang. « Multi-Time-Scale Coordinated Operation of a Combined System with Wind-Solar-Thermal-Hydro Power and Battery Units ». Applied Sciences 9, n^o 17 (1 septembre 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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Karasinskiy, O. L., et Yu F. Tesyk. « CORRECTION OF ERRORS IN INSTRUMENTS FOR MEASURING ELECTRIC POWER PARAMETERS ». Tekhnichna Elektrodynamika 2021, n^o 2 (23 février 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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Rajicic, D., R. Ackovski et R. Taleski. « Voltage correction power flow ». IEEE Transactions on Power Delivery 9, n^o 2 (avril 1994) : 1056–62. http://dx.doi.org/10.1109/61.296308.

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Saied, M. M. « Optimal power factor correction ». IEEE Transactions on Power Systems 3, n^o 3 (1988) : 844–51. http://dx.doi.org/10.1109/59.14531.

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Shubbar, Mafaz M., Laith A. Abdul-Rahaim et Ahmed A. Hamad. « Cloud-Based Automated Power Factor Correction and Power Monitoring ». Mathematical Modelling of Engineering Problems 8, n^o 5 (31 octobre 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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Ren, Yaming, Shumin Fei et Haikun Wei. « Prediction-Correction Alternating Direction Method for Power Systems Economic Dispatch ». International Journal of Computer and Electrical Engineering 7, n^o 3 (2015) : 179–88. http://dx.doi.org/10.17706/ijcee.2015.7.3.179-188.

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Ornatskyi, D. P., S. V. Ehorov et V. V. Dovhan. « CORRECTION OF ERRORS OF THE MEASURING CHANNEL AVERAGE ACTIVE POWER ». Tekhnichna Elektrodynamika 2022, n^o 1 (24 janvier 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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Mathioudakis, K. « Gas Turbine Test Parameters Corrections Including Operation With Water Injection ». Journal of Engineering for Gas Turbines and Power 126, n^o 2 (1 avril 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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Feng, Zhao Hong, Tie Jun Jia, Xi Ming Xiao et Fu Jie Zhang. « Wind Power Allocation Based on Predictive Power Correction ». Applied Mechanics and Materials 644-650 (septembre 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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Schlecht, Martin F., et Brett A. Miwa. « Active Power Factor Correction for Switching Power Supplies ». IEEE Transactions on Power Electronics PE-2, n^o 4 (octobre 1987) : 273–81. http://dx.doi.org/10.1109/tpel.1987.4307862.

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Thèses sur le sujet "Power correction"

Amarasinghe, Kanishka A. « Resonance mode power supplies with power factor correction ». Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/23672.

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There is an increasing need for AC-DC converters to draw a pure sinusoidal current at near unity power factor from the AC mains. Most conventional power factor correcting systems employ PWM techniques to overcome the poor power factor being presented to the mains. However, the need for smaller and lighter power processing equipment has motivated the use of higher internal conversion frequencies in the past. In this context, resonant converters are becoming a viable alternative to the conventional PWM controlled power supplies. The thesis presents the implementation of active power factor correction in power supplies, using resonance mode techniques. It reviews the PWM power factor correction circuit topologies previously used. The possibility of converting these PWM topologies to resonant mode versions is discussed with a critical assessment as to the suitability of the semiconductor switching devices available today for deployment in these resonant mode supplies. The thesis also provides an overview of the methods used to model active semiconductor devices. The computer modelling is done using the PSpice microcomputer simulation program. The modifications that are needed to the built in MOSFET model in PSpice, when modeling high frequency circuits is discussed. A new two transistor model which replicates the action of a OTO thyristor is also presented. The new model enables the designer to estimate the device parameters with ease by adopting a short calculation and graphical design procedure, based on the manufacturer's data sheets. The need for a converter with a high efficiency, larger power/weight ratio, high input power factor with reduced line current distortion and reduced cost has led to the development of a new resonant mode converter topology, for power processing. The converter presents a near resistive load to the mains thus ensuring a high input power factor, while providing a stabilised de voltage at the output with a small lOOHz ripple. The supply is therefore ideal for preregulation applications. A description of the modes of operation and the analysis of the power circuit are included in the thesis. The possibility of using the converter for low output voltage applications is also discussed. The design of a 300W, 80kHz prototype model of this circuit is presented in the thesis. The design of the isolation transformer and other magnetic components are described in detail. The selection of circuit components and the design and implementation of the variable frequency control loop are also discussed. An evaluation of the experimental and computer simulated results obtained from the prototype model are included in the presentation. The thesis further presents a zero-current switching quasi-resonant flyback circuit topology with power factor correction. The reasons for using this topology for off-line power conversion applications are discussed. The use of a cascoded combination of a bipolar power transistor and two power MOSFETs i~ the configuration has enabled the circuit to process moderate levels of power while simultaneously switching at high frequencies. This fulfils the fundamental precondition for miniaturisation. It also provides a well regulated DC output voltage with a very small ripple while maintaining a high input power factor. The circuit is therefore ideal for use in mobile applications. A preliminary design of the above circuit, its analysis using PSpice, the design of the control circuit, current limiting and overcurrent protection circuitry and the implementation of closed-loop control are all included in the thesis. The experimental results obtained from a bread board model is also presented with an evaluation of the circuit performance. The power factor correction circuit is finally installed in this supply and the overall converter performance is assessed.

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Xie, Manjing. « Digital Control for Power Factor Correction ». Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34258.

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This thesis focuses on the study, implementation and improvement of a digital controller for a power factor correction (PFC) converter. The development of the telecommunications industry and the Internet demands reliable, cost-effective and intelligent power. Nowadays, the telecommunication power systems have output current of up to several kilo amperes, consisting of tens of modules. The high-end server system, which holds over 100 CPUs, consumes tens of kilowatts of power. For mission-critical applications, communication between modules and system controllers is critical for reliability. Information about temperature, current, and the total harmonic distortion (THD) of each module will enable the availability of functions such as dynamic temperature control, fault diagnosis and removal, and adaptive control, and will enhance functions such as current sharing and fault protection. The dominance of analog control at the modular level limits system-module communications. Digital control is well recognized for its communication ability. Digital control will provide the solution to system-module communication for the DC power supply. The PFC converter is an important stage for the distributed power system (DPS). Its controller is among the most complex with its three-loop structure and multiplier/divider. This thesis studies the design method, implementation and cost effectiveness of digital control for both a PFC converter and for an advanced PFC converter. Also discussed is the influence of digital delay on PFC performance. A cost-effective solution that achieves good performance is provided. The effectiveness of the solution is verified by simulation. The three level PFC with range switch is well recognized for its high efficiency. The range switch changes the circuit topology according to the input voltage level. Research literature has discussed the optimal control for both range-switch-off and range-switch-on topologies. Realizing optimal analog control requires a complex structure. Until now optimal control for the three-level PFC with analog control has not been achieved. Another disadvantage of the three-level PFC is the output capacitor voltage imbalance. This thesis proposes an active balancing solution to solve this problem.
Master of Science

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Yeh, Thomas. « Analysis of power factor correction converters / ». Online version of thesis, 1992. http://hdl.handle.net/1850/11220.

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Williams, David. « Active power decoupling for a boost power factor correction circuit ». Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59145.

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During AC-DC conversion, the ripple power at the input of the converter must be filtered from the output. This filtering can be easily done by placing a capacitor on the DC bus. For systems with power output of hundreds of Watts or more, this capacitor must be quite high to effectively perform the filtering, and in order to be cost effective, an aluminum electrolytic capacitor (Al e-caps) needs to be used. The lifespan of Al e-caps is notoriously short, so for long lifespan systems, their use is not advisable. Film capacitors have longer lifespans than Al e-caps but are more expensive on a cost per Farad basis. Methods have been proposed to reduce the required capacitance so that film capacitors can be cost effectively used. One of these methods is to use a separate decoupling port in the circuit that can filter the ripple power without the limitation of being connected directly to the DC bus. The first contribution is a method of using an active power decoupling (APD) port with a buck-based circuit that does not require direct measurement of the AC input signal for controlling the ripple power to the port. This APD port requires only two extra switches and some simple signal processing circuitry to generate a reference signal and control the voltage to the APD port capacitor. The second contribution is a design guide for a sliding mode control (SMC) system for the APD port. SMC shows promise as a control system for power electronics circuits and has never been demonstrated on an APD port before. The proposed circuit and control system is used in a 700 Watt AC-DC converter with power factor correction and is compared in simulation to a benchmark converter using a passive capacitor on the DC bus. The capacitance is reduced from 300μF to a 35μF and a 75μF capacitor without any effect on performance as indicated by measures of the voltage ripple, power factor and total harmonic distortion. The capacitance reduction results in a cost savings of $175 on capacitors when using prices that were current at time of publication.
Applied Science, Faculty of
Engineering, School of (Okanagan)
Graduate

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Niezrecki, Christopher. « Power factor correction and power consumption characterization of piezoelectric actuators ». Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/42619.

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A piezoceramic actuator used for structural control behaves electrically as a nearly pure capacitance. When conventional amplifiers are used to drive these actuators, the current and voltage is close to 90 degrees out of phase. This causes the power factor (PF) of the load to be close to zero and results in excessive power requirements. This thesis reports the results of a study of the following question: What effect does applying power factor correction methods to piezoceramic actuators have on their power consumption characteristics? A subproblem we explored was to detennine the qualitative relationship between the power consumption of a piezoceramic actuator and the damping that actuator added to a structure. To address the subproblem, a feedback control experiment was built which used a ceramic piezoceramic actuator and a strain rate sensor configured to add damping to a cantilevered beam. A disturbance was provided by a shaker attached to the beam. The power consumption of the actuator was detennined by measuring the current and voltage of the signal to the actuator. The energy dissipated in the beam by the feedback control loop was assumed to be modeled by an ideal structural damping model. A model relating structural damping as a function of the apparent power consumed by the actuator was developed, qualitatively verified, and physically justified. Power factor correction methods were employed by adding an inductor in both parallel to and in series with the piezoceramic actuator. The inductance values were chosen such that each inductor-capacitor (LC) circuit was in resonance at the second natural frequency of the beam. Implementing the parallel LC circuit reduced the current consumption of the piezoceramic actuator by 75% when compared to the current consumption of the actuator used without an inductor. Implementing the series LC circuit produced a 300% increase in the voltage applied to the actuator compared to the case when no inductor was used. In both cases, employing power factor correction methods corrected the power factor to near unity and reduced the apparent power by 12 dB. A theoretical model of each circuit was developed. The analytical and empirical results are virtually identical. The results of this study can be used to synthesize circuits to modify piezoceramic actuators, reducing the voltage or current requirements of the amplifiers used to drive those actuators
Master of Science

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Qian, Jinrong. « Advanced Single-Stage Power Factor Correction Techniques ». Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30773.

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Five new single-stage power factor correction (PFC) techniques are developed for single-phase applications. These converters are: Integrated single-stage PFC converters, voltage source charge pump power factor correction (VS-CPPFC) converters, current source CPPFC converters, combined voltage source current source (VSCS) CPPFC converters, and continuous input current (CIC) CPPFC converters. Integrated single-stage PFC converters are first developed, which combine the PFC converter with a DC/DC converter into a single-stage converter. DC bus voltage stress at light load for the single-stage PFC converters are analyzed. DC bus voltage feedback concept is proposed to reduce the DC bus voltage stress at light load. The principle of operations of proposed converters are presented, implemented and evaluated. The experimental results verify the theoretical analysis. VS-CPPFC technique use a capacitor in series with a high frequency voltage source to achieve the PFC function. In this way, the input inductor is eliminated. VS-CPPFC AC/DC converters are developed, and their performance is evaluated. VS-CPPFC electronic ballasts with and without dimming function are also presented. The average lamp current control with duty ratio modulation is developed so that the lamp operates in constant power with a low crest factor over the line variation. The experimental results verify the CPPFC concept. CS-CPPFC technique employs a capacitor in parallel with a high frequency current source to obtain the PFC function. The unity power factor condition and principle of operation are analyzed. By doing so, the switch has less switching current stress, and deals only with the resonant inductor current. Design considerations and experimental results of the CS-CPPFC electronic ballast are presented. VSCS-CPPFC technique integrates the VS-CPPFC with the CS-CPPFC converters. The circuit derivation, unity power factor condition and design considerations are presented. The developed VSCS-CPPFC converters has constant lamp operation, low crest factor with a high power factor even without any feedback control. CIC-CPPFC technique is developed by inserting a small inductor in series with the line rectifier for the conceptual VS-CPPFC, CS-CPPFC and VSCS-CPPFC circuits. The circuit derivation and its unity power factor condition are discussed. The input current can be designed to be continuous, and a small line input filter can be used. The circulating current in the resonant tank and the switching current stress are minimized. The average lamp current control with switching frequency modulation is developed, so the developed electronic ballast operates in constant power, low crest factor. The developed CIC-CPPFC electronic ballast has features of low line input current harmonics, constant lamp power, low crest factor, continuous input current, low DC bus voltage stress, small circulating current and switching current stress over a wide range of line input voltage.
Ph. D.

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Jiang, Yimin. « Development of advanced power factor correction techniques ». Diss., Virginia Polytechnic Institute and State University, 1994. http://hdl.handle.net/10919/53609.

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Three novel power factor correction (PFC) techniques are developed for both single-phase and three-phase applications. These techniques have advantages over the conventional approaches with regard to the converter efficiency, power density, cost, and reliability for many applications. The single-phase parallel PFC (PPFC) technique was established. Different from the conventional two-cascade-stage scheme, the PPFC technique allows 68% of input power to go to the output through only one time high frequency power conversion, but still achieves both unity power factor and tight output regulation. A family of PPFC converters were proposed for different power levels, which are simpler and more efficient than the conventional two-cascade-stage systems. Since isolated boost converters are adopted as the main power stage in some of the PPFC converters, a device based soft-switching technique was proposed for using IGBTs as the main power switches, which ensures the lower cost and higher efficiency benefits of the PPFC technique. The single-ended boost converter is the most frequently used converter in the single-phase PFC applications. For high power and/or high voltage applications, the major concerns of the conventional boost converter are the inductor volume and weight, and Iosses on the power devices, which will affect converter efficiency, power density, and cost. In this dissertation, a novel three-level boost converter was developed, which can use a much smaller inductor and lower voltage devices than the conventional one, yielding higher power density, higher efficiency, and lower cost. In three-phase applications, the three-phase boost rectifier is the most popular topology for the PFC purpose. A novel high performance boost PFC rectifier was developed, which provides several superior features than the conventional one with nearly no cost increase. lt inherently provides six-step PWM operation, which is the optimal PWM scheme with no circulating energy, minimum input ripple current, and minimum . switching events. It also greatly reduces the bridge diode reverse recovery loss, which is one of the major switching Iosses in the conventional three-phase boost rectifier. Furthermore, it can adopt very simple soft-switching techniques even with three independent analog controllers to further improve the performance. Several simple soft switched three-phase boost rectifiers have been developed. Besides, the bridge shoot-through problem is virtually eliminated. As a result, these new three-phase boost rectifiers have higher efficiency, higher power density, lower cost, and higher reliability compared with the conventional one.
Ph. D.

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Chan, Weng Hong. « Harmonic reduction and power factor correction in low power supply system ». Thesis, University of Macau, 2002. http://umaclib3.umac.mo/record=b1445817.

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Tan, Benjamin H. « A Novel Arc Welding Power Supply with Improved Power Factor Correction ». DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2199.

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This paper presents the design and development of a novel Arc Welding Power Supply utilizing a modified two-switch forward converter topology. The proposed design improves the power quality by improving power factor to near unity and reducing total harmonic distortion. State space analysis of the proposed circuit showed that the circuit followed a boost-buck input output relationship. Simulation of the circuit was first implemented in LTspice to verify the functionality of the new topology. Hardware implementation of the proposed design was built on a scaled-down prototype for a proof-of-concept of the new topology. The prototype specifications were created for a 5A, 20V output with a 20-24V, 60Hz input. This project demonstrated that the proposed new topology was successful in obtaining a near unity power factor and a total harmonic distortion of less than 2%. Additionally, the prototype followed the simulation and calculations of a boost-buck function while varying duty cycle, and the final measurements aligned well with waveforms from the simulation.

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Jones, Kevin David. « Harmonic distortion correction using active power line conditioners ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA300873.

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Livres sur le sujet "Power correction"

C, Lee Fred, Borojeviċ Dusa̧n et Virginia Power Electronics Center, dir. Switching rectifiers for power factor correction. [Virginia] : Virginia Power Electronics Center, 1994.

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Kappenman, Russell F. Estimation of the fishing power correction factor. [Seattle, Wash.] : Alaska Fisheries Science Center, National Marine Fisheries Service, U.S. Dept. of Commerce, 1992.

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Johnson, David R. Cointegration, error correction and purchasing power parity. Waterloo, Ont : School of Business and Economics, Wilfrid Laurier University, 1987.

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Capacitor, Commonwealth Sprague, dir. Power factor correction : A guide for the plant engineer. North Adams, MA : Commonwealth Sprague Capacitor, Inc., 1996.

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Carreno, Antonio Garcia. Cointegration, error correction, and purchasing power parity between Mexico and the USA. [s.l.] : typescript, 1996.

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Loftness, Marvin O. AC power interference manual : New insights into the causes, effects, locating, and correction of power-line and electrical interference. Tumwater, WA : Percival Pub., 1996.

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A, Gregory Don, et United States. National Aeronautics and Space Administration., dir. Investigation of fiber optics based phased locked diode lasers : Phase correction in a semiconductor amplifier array using fiber optics : final report. [Washington, DC : National Aeronautics and Space Administration, 1997.

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Davis, James Arthur. Peak-to-mean power control and error correction for OFDM transmission using Golay sequences and Reed-Muller codes. Palo Alto, CA : Hewlett-Packard Laboratories, Technical Publications Department, 1996.

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FROM BLACK POWER TO PRISON POWER : The making of Jones v. North Carolina Prisoners' Labor Union. New York : Palgrave Macmillan, 2012.

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Chapitres de livres sur le sujet "Power correction"

Neacșu, Dorin O. « Power Factor Correction ». Dans Telecom Power Systems, 275–98. Boca Raton : CRC Press, 2017. http://dx.doi.org/10.4324/9781315104140-10.

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Gao, Feng, et Tao Xu. « Closed-Loop Correction Strategies ». Dans Power Systems, 141–75. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-7446-4_6.

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Tooley, Mike, et Lloyd Dingle. « Power, power factor and power factor correction ». Dans Engineering Science, 469–76. 2nd edition. | Boca Raton, FL : Routledge [2021] : Routledge, 2020. http://dx.doi.org/10.1201/9781003002246-29.

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Aghbolaghi, Ali Jafari, Naser Mahdavi Tabatabaei, Morteza Kalantari Azad, Mozhgan Tarantash et Narges Sadat Boushehri. « Correction to : Microgrid Planning and Modeling ». Dans Power Systems, C1. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23723-3_32.

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Bellucci, Stefano, Bhupendra Nath Tiwari et Neeraj Gupta. « Phase Shift Correction ». Dans Geometrical Methods for Power Network Analysis, 61–66. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33344-6_7.

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Kaiser, K., W. Langreder, H. Hohlen et J. Højstrup. « Turbulence Correction for Power Curves ». Dans Wind Energy, 159–62. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-33866-6_28.

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Baringo, Luis, et Morteza Rahimiyan. « Correction to : Virtual Power Plant Model ». Dans Virtual Power Plants and Electricity Markets, C1. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-47602-1_8.

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Jiang, Yuan, et Qing Li. « Correction to : Vacuum Circuit Breaker for Aviation Variable Frequency Power System ». Dans Power Systems, C1. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4781-6_6.

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Chen, Qixin, Hongye Guo, Kedi Zheng et Yi Wang. « Correction to : Introduction to Power Market Data ». Dans Data Analytics in Power Markets, C1. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-4975-2_14.

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Holm, Sverre. « Correction to : Waves with Power-Law Attenuation ». Dans Waves with Power-Law Attenuation, C1. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-14927-7_10.

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Actes de conférences sur le sujet "Power correction"

Zuniga, Koldo, Thomas P. Schmitt, Herve Clement et Joao Balaco. « Model Based Performance Correction Methodology — A Case Study ». Dans ASME 2014 Power Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/power2014-32184.

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Correction curves are of great importance in the performance evaluation of heavy duty gas turbines (HDGT). They provide the means by which to translate performance test results from test conditions to the rated conditions. The correction factors are usually calculated using the original equipment manufacturer (OEM) gas turbine thermal model (a.k.a. cycle deck), varying one parameter at a time throughout a given range of interest. For some parameters bi-variate effects are considered when the associated secondary performance effect of another variable is significant. Although this traditional approach has been widely accepted by the industry, has offered a simple and transparent means of correcting test results, and has provided a reasonably accurate correction methodology for gas turbines with conventional control systems, it neglects the associated interdependence of each correction parameter from the remaining parameters. Also, its inherently static nature is not well suited for today’s modern gas turbine control systems employing integral gas turbine aero-thermal models in the control system that continuously adapt the turbine’s operating parameters to the “as running” aero-thermal component performance characteristics. Accordingly, the most accurate means by which to correct the measured performance from test conditions to the guarantee conditions is by use of Model-Based Performance Corrections, in agreement with the current PTC-22 and ISO 2314, although not commonly used or accepted within the industry. The implementation of Model-based Corrections is presented for the Case Study of a GE 9FA gas turbine upgrade project, with an advanced model-based control system that accommodated a multitude of operating boundaries. Unique plant operating restrictions, coupled with its focus on partial load heat rate, presented a perfect scenario to employ Model-Based Performance Corrections.

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Li, Bryan, Mike J. Gross et Thomas P. Schmitt. « Gas Turbine Gas Fuel Composition Performance Correction Using Wobbe Index ». Dans ASME 2010 Power Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/power2010-27093.

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Gas turbine thermal performance is dependent on many external conditions, including fuel gas composition. Variations in composition cause changes in output and heat consumption during operation. Measured performance must be corrected to specified reference conditions prior to comparison against performance specifications. The fuel composition is one such condition for which performance corrections are required. The methodology of fuel composition corrections can take various forms. One current method of correction commonly used is to characterize fuel composition effects as a function of heating value and hydrogen-to-carbon ratio. This method has been used in the past within a limited range of fuel composition variation around the expected composition, yielding relatively small correction factors on the order of +/− 0.1%. Industry trends suggest that gas turbines will continue to be exposed to broader ranges of gas constituents, and the corresponding performance effects will be much larger. For example, liquefied natural gas, synthesized low BTU fuel, and bio fuels are becoming more common, with associated performance effects of +/− 0.5% or greater. As a result of these trends, performance test results will bear a greater dependency on fuel composition corrections. Hence, a more comprehensive correction methodology is required to encompass a broader range of fuel constituents encountered. Combustion system behavior, specifically emissions and flame stability, is also influenced by variations in fuel gas composition. The power generation industry uses Wobbe Index as an indicator of fuel composition. Wobbe Index relates the heating value of the fuel to its density. High variations in Wobbe Index can cause operability issues including combustion dynamics and increased emissions. A new method for performance corrections using Wobbe Index as the correlating fuel parameter has been considered. Analytical studies have been completed with the aid of thermodynamic models to identify the extent to which the Wobbe Index can be used to correlate the response of the gas turbine performance parameters to fuel gas composition. Results of the study presented in this paper suggest that improved performance test accuracy can be achieved by using Wobbe Index as a performance correction parameter, instead of the aforementioned conventional fuel characteristics. Furthermore, a relationship between this method’s accuracy and CO2 content of fuel is established such that an additional correction yields results with even better accuracy. This proposed method remains compliant with intent of internationally accepted test codes such as ASME PTC-22, ASME PTC-46, and ISO 2314.

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Mathioudakis, K. « Gas Turbine Test Parameters Corrections Including Operation With Water Injection ». Dans ASME Turbo Expo 2002 : Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30466.

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« Power factor correction ». Dans 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551). IEEE, 2004. http://dx.doi.org/10.1109/pesc.2004.1355454.

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Winterberger, Thomas P., et Robert A. Ransom. « Combined Cycle Steam Turbine Inlet Flow Passing Capability : Impact on Plant Operation, Turbine Design, and Test Result Accuracy ». Dans ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASMEDC, 2011. http://dx.doi.org/10.1115/power2011-55148.

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The publication of ASME Performance Test Code 6.2-2004 provided the industry with a Code document dedicated to calculating the performance of a steam turbine in a combined cycle power plant. Power output at specified steam flows and conditions was chosen as the Code’s primary performance parameter. That choice was based on the operating and cycle characteristics of a combined cycle plant operating, where the steam turbine is part of the bottoming cycle operating in a sliding pressure mode that follows ambient conditions and the gas turbine operating profile. This steam turbine generator output, corrected to reference heat consumption, is called Output Performance and is a measurement of steam turbine efficiency. Accompanying this new Code was a new correction methodology that focused on correcting the steam turbine generator output to the reference heat consumption of the cycle. In the development of the overall correction methodology, the corrections associated with high-pressure (HP) steam inlet conditions were given careful attention. The committee developing the Code and methodology concluded that three correction formulations were required to accurately and fairly correct back to the reference heat input of the high-pressure turbine inlet, and to account for changes in the as-built flow capacity versus the design flow capacity. The new correction formulations chosen were: • HP Steam Flow; • HP Steam Temperature; • HP Turbine Flow Capacity. Applying these three corrections on a sliding pressure steam turbine ensures that the output performance is corrected to the true reference high pressure steam heat input to the cycle. If any of these three corrections is excluded the calculated output performance will not be a true representation of the steam turbine efficiency.

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« Power factor correction techniques ». Dans 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551). IEEE, 2004. http://dx.doi.org/10.1109/pesc.2004.1355188.

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Deen, Philip G., Juan Gutierrez, Terry B. Sullivan et Jeffrey R. Friedman. « Comparison of ASME PTC-46 Performance Test Correction Factors as Estimated in a Project Proposal Phase to Those Determined During Project Implementation ». Dans ASME 2007 Power Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/power2007-22107.

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Accurate performance correction equations are essential to the successful implementation of an initial performance test of a new unit, and to continually monitor performance in a meaningful way. Developers of these formulations must consider the latest design information of all major equipment in the cycle. Per Section 5.3.5 of ASME PTC 46–1996 [Ref. 1], these corrections are to be developed from a heat balance computer model after it is “finalized following purchase of all major equipment and receipt of performance information from all vendors.” This paper reviews the requirements for the development of accurate correction curve/factor formulations for a typical combined cycle power plant, and demonstrates how significantly skewed the results of a test can be if assumptions on equipment design performance are made prior to manufacturers’ final submittals.

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Khan, A., I. Batarseh, K. Siri et J. Elias. « Boost power factor correction circuits ». Dans Proceedings of SOUTHCON '94. IEEE, 1994. http://dx.doi.org/10.1109/southc.1994.498165.

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Chen, Minjie, Sombuddha Chakraborty et David J. Perreault. « Multitrack power factor correction architecture ». Dans 2018 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2018. http://dx.doi.org/10.1109/apec.2018.8341094.

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Khan, Muhammad Bilal, et Muhammad Owais. « Automatic power factor correction unit ». Dans 2016 International Conference on Computing, Electronic and Electrical Engineering (ICE Cube). IEEE, 2016. http://dx.doi.org/10.1109/icecube.2016.7495239.

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Rapports d'organisations sur le sujet "Power correction"

Parzen, G. RHIC Correction System, Reduction in Power Supplies. Office of Scientific and Technical Information (OSTI), août 1985. http://dx.doi.org/10.2172/1119041.

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Kang, Y. G. Correction magnet power supplies for APS machine. Office of Scientific and Technical Information (OSTI), avril 1991. http://dx.doi.org/10.2172/97089.

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Meth, M., et J. Sandberg. POWER FACTOR CORRECTION and HARMONIC FILTERS AT THE AGS. Office of Scientific and Technical Information (OSTI), janvier 1995. http://dx.doi.org/10.2172/1151319.

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Kueck, John D., D. Tom Rizy, Fangxing Li, Yan Xu, Huijuan Li, Sarina Adhikari et Philip Irminger. Local Dynamic Reactive Power for Correction of System Voltage Problems. Office of Scientific and Technical Information (OSTI), décembre 2008. http://dx.doi.org/10.2172/945348.

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Zabar, Z., et N. Kaish. Power factor correction system by means of continuous modulation. Final report. Office of Scientific and Technical Information (OSTI), août 1997. http://dx.doi.org/10.2172/510606.

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Mi J. L. THE INITIAL COMPARISON AMONG THREE SCHEMES OF PROGRAMMABLE BIPOLAR POWER SUPPLY USED IN THE BOOSTER CORRECTION SYSTEM. Office of Scientific and Technical Information (OSTI), juin 1988. http://dx.doi.org/10.2172/1151207.

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Soroko, S. I., et S. S. Bekshaev. NEW TECHNOLOGY OF CORRECTION OF NEUROPSYCHIC STATES USING BIOFEEDBACK REGULATION OF POWER AND LOCALIZATION OF ELECTRIC DIPOLE OF EEG. ГИЭФПТ, 2018. http://dx.doi.org/10.18411/j.raenjourn.s2018-1.

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Ishaque, Mohammed. A new method for calculating the economic benefits of varying degrees of power factor correction for industrial plant loads. Portland State University Library, janvier 2000. http://dx.doi.org/10.15760/etd.6206.

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Butterweck, Gernot, Alberto Stabilini, Benno Bucher, David Breitenmoser, Ladislaus Rybach, Cristina Poretti, Stéphane Maillard et al. Aeroradiometric measurements in the framework of the Swiss Exercise ARM22. Paul Scherrer Institute, PSI, mars 2023. http://dx.doi.org/10.55402/psi:51194.

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The flights of the civil (ARM22c) and military (ARM22m) parts of the exercise were performed between June 13th and 17th and between September 5th and September 9th, respectively. Both parts of the exercise included the measurement of altitude profiles. Two profiles were measured during ARM22c over Lake Thun and one profile during ARM22m over Lake Neuchâtel with sufficient altitude range to determine the slope of the altitude-dependent cosmic correction. The altitude profile over Lake Neuchâtel showed a clear deviation from the expected profile, suggesting a massive influence of airborne radon progeny on the result. According to the alternating schedule of the annual ARM exercises, the environs of the nuclear power plants Beznau (KKB) and Leibstadt (KKL), the Paul Scherrer Institute (PSI) and the intermediate storage facility (ZWILAG) were surveyed with an extension of the measuring area into German territory, following a request of German authorities. The site of the former Lucens reactor was measured and found unobtrusive in the measured data. Background flights were performed over several Swiss cities, regions and valleys. Besides attenuation effects of water bodies, variations of natural radionuclide content could be observed. Remains of the Chernobyl deposition were detected near the French border and in southern Switzerland.

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Poblaguev, Andrei. Absorptive corrections to the forward elastic proton-proton analyzing power An. Office of Scientific and Technical Information (OSTI), octobre 2021. http://dx.doi.org/10.2172/1825737.

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