The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Wang Chunjie - One of the best experts on this subject based on the ideXlab platform.
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a new medium voltage speed Variable Drive for fans and pumps rotor side Variable Frequency Drive
IEEE Transactions on Power Electronics, 2004Co-Authors: Wang ChunjieAbstract:This paper introduces a novel VVVF method, i.e. rotor side Frequency-Variable Drive, which can be used to regulate the rotating velocity of high power fan and medium-voltage motor for pumpe by using a medium power low voltage IGBT inverter. In the new method, the stator winding is directly connected to 6 kV or 10 kV network and the inverter is removed from stator side to rotor side. The new method is featured by simple main circuit, reactance-less, high power factor and low harmonics, easy to start and by-pass operation.
Emmanuel B. Agamloh - One of the best experts on this subject based on the ideXlab platform.
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Operation of Variable-Frequency Drive Motor Systems With Source Voltage Unbalance
IEEE Transactions on Industry Applications, 2017Co-Authors: Emmanuel B. Agamloh, Scott Peele, Joe GrappeAbstract:This paper describes efficiency measurement in induction motor and Variable-Frequency Drives systems under imposed voltage unbalance at the Drive input. A number of Drives from different manufacturers are tested with matching sizes of motors and the results are compared. The results highlight differences in the effect of voltage unbalance on Drive performance. The results also indicate that intrinsic motor performance has important influence on motor-Drive system efficiency.
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Induction machine efficiency measurement using a Variable Frequency Drive source
2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017Co-Authors: Emmanuel B. Agamloh, Andrea Cavagnino, Silvio VaschettoAbstract:Induction motor loss segregation and efficiency measurement requires loading dynamometers and other equipment such as a Variable voltage sinusoidal power supply. These are expensive and not often available even when a loading device is accessible. Variable Frequency Drives are now widely used for operating induction machines and are more widely available and less expensive. However, their use in place of a fixed Frequency sinusoidal power supply to directly measure machine efficiency is intriguing, but inherently challenging due to the PWM output voltage. This paper presents some investigations for using Variable Frequency Drives to perform IEEE 112B and IEC 60034-2-1 tests. The use of the Drive, the measurement criteria and procedures are reported and discussed. The results presented demonstrate the feasibility of the proposed concept for measuring machine efficiency with a PWM power source.
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Power and efficiency measurement of motor-Variable Frequency Drive systems
2015 61st IEEE Pulp and Paper Industry Conference (PPIC), 2015Co-Authors: Emmanuel B. AgamlohAbstract:This paper describes power and efficiency measurement in motor and Variable Frequency Drive systems. The paper first presents an overview of existing international standards relating to motor and Variable Frequency Drives systems and then discusses some of the challenges involved in measuring the power from the pulse-width modulated source. Differences in power measurements due to different power analyzer settings are demonstrated. Two induction motors were tested with sinusoidal supply and Variable Frequency Drive supply to demonstrate power measurement challenges. The results of efficiency tests are compared for a five horsepower motor.
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an experimental evaluation of the effect of voltage distortion on the performance of induction motors
Pulp and Paper Industry Conference, 2012Co-Authors: Emmanuel B. Agamloh, Scott Peele, Joe GrappeAbstract:A Variable Frequency Drive operated motor was used to inject harmonics onto a bus bar on which a smaller line connected test motor is operating. The effect of voltage distortion on the operation of each test motor is investigated by measuring their operating efficiency. The motors tested comprise integral horsepower three phase motors of EPACT and NEMA Premium design as well as single phase motors. It was verified that distortion levels of about 8%THD have negligible effect on the operation of both the integral and single phase motors.
Choong-koo Chang - One of the best experts on this subject based on the ideXlab platform.
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Reliability analysis of application of Variable Frequency Drive on condensate pump in nuclear power plant
Journal of International Council on Electrical Engineering, 2019Co-Authors: John Kweku Avor, Choong-koo ChangAbstract:The aim of this paper is to analyze the reliability of Variable Frequency Drives (VFD) when used to control condensate pump motor in a nuclear power plant. IEC 60812 system reliability analysis pro...
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Reliability analysis of application of Variable Frequency Drive on condensate pump in nuclear power plant
Taylor & Francis Group, 2019Co-Authors: John Kweku Avor, Choong-koo ChangAbstract:The aim of this paper is to analyze the reliability of Variable Frequency Drives (VFD) when used to control condensate pump motor in a nuclear power plant. IEC 60812 system reliability analysis procedure for Failure Mode and Effects Analysis (FMEA) was used to determine the potential failure modes for VFD and its effects on the operation of the condensate pump motor. In addition, Electrical Transient Analysis Program (ETAP) was used to simulate the performance and evaluate system reliability indices of the VFD for APR1400 auxiliary power system. The objective for adopting these two approaches is to use the FMEA for comprehensive identification and evaluation of unwanted effects of VFD malfunction on the condensate pump operation; and the ETAP was used to quantify the impact of VFD operation on system reliability indices. From the FMEA model, the Insulated Gate Bipolar Transistor (IGBT) and the motor stator winding were identified as the components with high susceptibility to failure. The overall reliability assessment showed that VFD failure effects are generally incipient. Average system availability increased marginally when VFD was used instead of the existing throttle valve for condensate flow control
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application of Variable Frequency Drive on the condensate pump motors of apr1400 nuclear power plants for energy savings
Journal of International Council on Electrical Engineering, 2018Co-Authors: Exavier Zakaria Barie, Choong-koo ChangAbstract:Condensate pumps provide the motive force to deliver condensate from the hotwell to the deaerator storage tanks. Advanced Power Reactor 1400 (APR1400) is comprised of three 50% capacity motor Drive...
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Application of Variable Frequency Drive on the condensate pump motors of APR1400 nuclear power plants for energy savings
Taylor & Francis Group, 2018Co-Authors: Exavier Zakaria Barie, Choong-koo ChangAbstract:Condensate pumps provide the motive force to deliver condensate from the hotwell to the deaerator storage tanks. Advanced Power Reactor 1400 (APR1400) is comprised of three 50% capacity motor Driven condensate pumps with control performed by level control valves (LCVs). This configuration presents a challenge since the flow of condensate water is controlled by LCVs only. These LCVs are in throttled position in the pipeline where throttling of valves causes the loss of system efficiency by increasing the resistance to the flow. Generally, Variable Frequency Drives (VFDs) allow to operate motors and pumps at the precise speed needed for the process and energy saving. This paper investigates if there are any advantages when VFD is used to control the CPs and check the possibility of eliminating LCVs. Therefore, the NPP model was developed using Electrical Transient Analysis Program (ETAP) software and was benchmarked to APR1400. The analysis was performed with VFD installed and without VFD. The new approach for CP energy saving calculation using VFD was introduced and the results were confirmed by the ETAP model simulation results. The conclusion was drawn from the results whether the application of VFD for CPs has advantages for energy savings and economic benefits
Jiang Jianguo - One of the best experts on this subject based on the ideXlab platform.
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study of rotor side Variable Frequency Drive system based on dual pwm technology
IEEE Transactions on Power Electronics, 2009Co-Authors: Jiang JianguoAbstract:Fan and pump load cost tremendous power consumption in power systems,but they don't require high speedadjusting performance and wide speed adjustable range,therefore,the cascaded speed-adjusting system is an economic and practical solution.This paper gives a novel topology using two PWM converters,which integrates the cascaded speed control and dual PWM technologies.Such combination system has the advantages of both technologies,which are low harmonics pollution,high power factor,bi-derectional energy flow and convenient for motor's four quadrant running.This paper adopts the implementation strategy of rotor-side dual PWM Variable Frequency Drive based on independent control,gives the system control diagram and verifies its flexibility through simulation and experiments.
H Norbert - One of the best experts on this subject based on the ideXlab platform.
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real time simulation of Variable speed parallel pumping system
Energy Procedia, 2017Co-Authors: V Arun K Shankar, S Umashankar, S Paramasivam, H NorbertAbstract:Abstract Energy is the world’s fundamental requirement to perform any work. Presently, insufficiency in energy is the major challenge faced throughout the world. Among the total installed loads, pumping contributes, 30% of them. Thus considerable improvement in energy savings is possible by increasing the energy efficiency of the pumping system. Nowadays, the usage of Variable Frequency Drives (VFDs) for pumping system is becoming inevitable due to their control over flow rate variation. This paper presents the performance of real time simulated Variable speed multi pumping system. The Variable speed pumps using affinity laws reduces power up to 80% when there is a reduction in speed of 50%. The efficiency of the pumping system is identified by incorporating the efficiency of both motor and the Variable Frequency Drive (VFD).
