Induction Machine Efficiency at Variable Frequencies

Agamloh, Emmanuel; Cavagnino, Andrea; Vaschetto, Silvio

doi:10.1109/ecce.2019.8912969

Cited by 1 publication

(1 citation statement)

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“…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

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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.

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