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Variable-frequency drive

About: Variable-frequency drive is a research topic. Over the lifetime, 837 publications have been published within this topic receiving 5691 citations. The topic is also known as: VFD.


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Journal ArticleDOI
TL;DR: This paper presents a development of a model of a set of multistage centrifugal electro pumps including two 4 stage stainless steel centrifugal pumps, each coupled to a 4 kW three-phase induction motor, connected to a hydraulic application running under two control strategies including constant speed and variable speed methods.
Abstract: This paper presents a development of a model of a set of multistage centrifugal electro pumps including two 4 stage stainless steel centrifugal pumps, each coupled to a 4 kW three-phase induction motor, connected to a hydraulic application running under two control strategies including constant speed and variable speed methods. Each pump provides 16 m3/hr flow rate and 58mwater head at BEP (Best Efficiency Point). Dynamicity of the model causes variations in all operational parameters of pumping system in any variation on consuming flow rate. Each electro pump has been driven with a variable frequency drive utilizing frequency control method for adjusting the rotational speed under a PID control regarding to match of pumping system operational point with the consumption point to save the energy. 83% energy saving is achieved by model in variable speed control strategy comparing to constant speed control strategy. MATLAB/SIMULINK software using ode45 solver and variable step size simulates this model.

5 citations

Proceedings ArticleDOI
01 Jun 2017
TL;DR: In this paper, a variable frequency drive (VFD) is implemented to drive a three-phase (3φ) induction motor using battery bank and regenerative braking mechanism is used to make the system more efficient.
Abstract: Most recently, the major proportion of transporta-tion sector utilizes fossil fuels. Burning of fossil fuels adds massive amount of carbon in the atmosphere. Moreover, the fossil fuels reserves are depleting and their prices are also fluctuating. In addition, new environmental policies are also being made to reduce carbon emissions. So, electrification of the transportation sector is essential to reduce greenhouse gas emissions. This paper proposes an improved method of assembling an electric drive system. A variable frequency drive (VFD) is implemented to drive a three-phase (3φ) induction motor using battery bank. The sinusoidal pulse width modulation (SPWM) technique is used to implement the VFD. To make the system more efficient a regenerative braking mechanism is used. In addition, a solar panel is also used to supply the auxiliary loads.

5 citations

Proceedings ArticleDOI
01 Jan 2018
TL;DR: This paper outlines the methodology of designing and implementation of a solar powered system which can be used to make a human comfort zone during day time without using battery backup but with the use of Supercapacitors, and major converter losses are reduced.
Abstract: This paper outlines the methodology of designing and implementation of a solar powered system which can be used to make a human comfort zone during day time without using battery backup but with the use of Supercapacitors. Basically, major converter losses are reduced in this system. In acquiring a highly efficient power supply, the charge controller plays an important role. When a DC microgrid powers DC loads based on a renewable source such as a PV system; energy storage becomes mandatory due to fluctuating nature of the source. Localized DC-energy storage within DC-DC converters could address this requirement. A variation of supercapacitor assisted regulators could provide localized energy storage with low-noise and fast transient response [1]. 12 V LED lights will be powered from this system. LEDs can be powered directly via a supercapacitor bank from the regulated Photovoltaic energy. In the case of Inverter type Air Conditioner, in order to overcome converter losses, the DC Bus inside it should be accessed. Typically, DC Bus voltage inside the Variable Frequency Drive (VFD) is 1–414 times the supply voltage. Hence DC-DC Converters are used to power up the inside circuitry of the Inverter Air Conditioner from the solar panel. In order to optimize the energy usage and reduce electricity consumption, light dimming and air conditioning control systems were added to control the light intensity and switching of the air conditioner.

5 citations

Proceedings ArticleDOI
17 Mar 2017
TL;DR: This paper shows review on stimulation and performance analysis of induction motor with VFD and without VFD for pump and helps to reduce operating cost of the entire system with that provides operational benefits and improves the system life.
Abstract: Electrical Energy conservation in the field of Induction Motor is important as two-third of world's electricity consumption is done by using Induction Motor. It has been stated that most of the energy in industry is consumed by AC motors. A problem related with these induction motors that is, large starting inrush current due to this current power consumption increased. To reduced these current by using variable frequency drive (VFD). VFD is a techniques used to control the speed of AC induction motors by changing the supply frequency. These drives are used for smooth start of large motors and continuously adjust the speed. With using VFD, energy cost savings are especially in pump application where the load torque and power vary with respect to speed of the induction motor. In that system it helps to reduce operating cost of the entire system with that provides operational benefits and improves the system life. This paper contain the experimental study of induction motor with VFD and without VFD for pump. With that study analysis these paper shows review on stimulation and performance analysis of induction motor with VFD and without VFD.

5 citations

Journal Article
TL;DR: In this article, a phase current reconstruction method was developed to lower the motor costs and volumes, increase the voltage transfer ratio and expand the operating range of permanent magnet synchronous motors (PMSM).
Abstract: A phase current reconstruction method was developed to lower the motor costs and volumes,increase the voltage transfer ratio and expand the operating range of permanent magnet synchronous motors(PMSM).The method adjusts the reference voltage vectors using the over-modulation mode.The method provides dc-link current detection in over-modulation mode and reconstruction of AC phase currents according to the inverter switching states.Tests conducted on a 4 kW pulse width modulation(PWM) inverter fed by a PMSM variable frequency drive system demonstrate that the method accurately reconstructs the AC phase currents with a high PWM inverter voltage transfer ratio(about 1.06).

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20239
202220
202143
202084
201956
201887