Study of the effectiveness of a variable frequency drive of an induction motor

Lozanov, Yavor; Tzvetkova, Svetlana; Petleshkov, Angel

doi:10.1109/bulef48056.2019.9030775

Cited by 4 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With decreasing demand, both cases operate with a single pump at variable speed, and mechanical power savings of up to 47.23% were obtained compared with the base case at a fixed speed. This analysis did not consider the losses of the motor or the frequency inverter, since under nominal conditions, electric motors are more efficient than pumps, and frequency inverters more efficient than motors; However, the efficiency of the motor can change with variations in load torque and speed [54][55][56]. The efficiency of the electrical system with a variable speed drive can be reduced by up to 8% with respect to the efficiency of the system with direct connection to the grid, but this reduction is not significant in relation to the energy savings achieved [56].…”

Section: Power Savingmentioning

confidence: 99%

Numerical Study of Constant Pressure Systems with Variable Speed Electric Pumps

et al. 2022

View full text Add to dashboard Cite

This work focuses on the modeling and simulation of constant pressure systems based on variable speed pumps, with the aim of studying and evaluating their performance from a multidisciplinary approach. Using the physical models of the Simscape library, from MATLAB/Simulink R2019b, two study cases are assembled consisting of: piping system, a hydropneumatic tank, centrifugal pumps with an induction motor, variable speed drives, and a control system. Case one is comprised of one pump at a fixed speed and another at variable speed, and case two with both pumps at variable speed. For the parameterization of the models, data from manufacturers and process requirements are used. The different stages of the control system are integrated and configured; these are constant V/f control, slip compensation, space vector modulation (SVM,) and pressure controller. The dynamic response of the system, power saving, transient current at startup, and harmonic distortion are evaluated. The results showed that both cases kept the pressure constant in the face of variable flow demand and smoothed out the current during startup. Case two saved more energy (between 28 and 49%) but generated more harmonic distortion. In addition, both cases have better performance compared with traditional fixed-speed technologies.

show abstract

Section: Power Savingmentioning

confidence: 99%

Numerical Study of Constant Pressure Systems with Variable Speed Electric Pumps

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In this analysis, the effect of the variable speed drive was not considered, given that under nominal conditions electric motors are more efficient than pumps, and variable speed drives more efficient than motors. However, the efficiency of the motor can change with variations in load torque and speed [33]- [35]. Burt et al [35] analyzed that the efficiency of the electrical system with variable speed drive can be reduced by up to 8% compared to the system with direct connection to the grid.…”

Section: Operational Efficiency Consumption and Power Savingsmentioning

confidence: 99%

Comparative study by numerical simulation of two methods for automatic flow control in centrifugal pumps

Andrade-Cedeno

Pérez‐Rodríguez²,

Amaya-Jaramillo³

et al. 2022

IJPEDS

View full text Add to dashboard Cite

Flow rate and pressure are variables of great interest in the process control industry, especially in pumping systems. With the help of modeling and simulation, it is possible to understand the operation of these systems prior to their construction, in addition to allowing their behavior to be analyzed in various operational scenarios and testing different control strategies. In this work, the hydraulic, mechanical, electrical and electronic models of the different components of the system are studied. Two study cases for automatic flow control are assembled, using Simscape library from MATLAB/Simulink R2019b. This study cases are: i) with a control valve and ii) with a variable speed drive. The simulations determined that both cases keep the flow constant in the face of pressure disturbances, with a good dynamic response. Case 2 consumes less power than case 1, between 24 and 64% less, especially at low flow rates. It also reduce unwanted mechanical and electrical problems due to sudden starts and stops. Case 2 produced harmonic pollution on both the grid and motor sides, which implies a potential risk for the motor and the electrical grid. Case 2 was experimentally validated, obtaining errors of less than 10%.

show abstract