Unbalanced Voltages Impacts on the Energy Performance of Induction Motors

<p>This paper presents an identification method to estimate simultaneously the electrical and mechanical induction machine (IM) parameters by using only the measured current and the corresponding phase voltage. This identification method is based on the output error and uses the multidimensional Alienor global optimization method as a minimization technique. Alienor method is essentially based on converting multivariable problem to monovariable one. To improve the Alienor method performance, the reducing transformation is proposed and compared with the genetic algorithm (GA). Firstly, the identification method is verified using the simulated data. Secondly, the validation is then confirmed by measured data from one machine. The corresponding computed transient and steady state currents agree well with the measured data. The results obtained show the superiority of the proposed Alienor method versus GA in terms of computing time.</p>

Section: Research Methods 21 Induction Machine Modelmentioning

confidence: 99%

“…They present an effective industrial solution in the field of high-performance drives. However, Efficient control or the analysis of induction motor operation require the instantaneous knowledge of machine parameters [1]. So, these parameters can be obtained by different methods.…”

Section: Introductionmentioning

confidence: 99%

Alienor method applied to induction machine parameters identification

Khemici¹,

Bounekhla²,

Boudissa³

2020

“…Among the total energy demand in the industries, motors consume nearly 70%. Due to the great energy consumption that electric motors have in the industry, not only in conditions of adequate parameters of energy quality, but also in the case where there are quality problems, every day there is more concern to increase the efficiency of motors [1][2][3][4]. At present, great attention is being given to the development of synchronous motors without windings in the rotor, replacing the induction motors (IM).…”

Section: Introductionmentioning

confidence: 99%

Direct-on-line-start permanent-magnet-assisted synchronous reluctance motors with ferrite magnets for driving constant loads

Viego

Santos

Gómez

et al. 2020

Self Cite

For driving constant loads in industry, the use of direct-on-line-start permanent-magnet-assisted synchronous reluctance motors with ferrite magnets (DOL-Start-PMa-SynRM) is proposed. The bibliographic search demonstrated that this new motor has greater efficiency than one similar induction motor (IM). It was evidenced that the main element that is required for direct starting is to insert a squirrel cage into the rotor of a PMa-SynRM, which does not produce negative operational effects in a steady state. An economic evaluation was carried out in a sugar mill company, applying the differential net present value (NPV) method, and a sensitivity analysis, considering the four factors that present the most variation. It was demonstrated, by means of a Pareto diagram standardized for the NPV that the most significant factors are fuel factor, lifespan and the multiplication of both. With response surfaces that are obtained with a multilevel factorial experiment, it was determined that, by varying the factors in the ranges considered, the NPV always remains positive and higher than 2200 USD. This is mainly due to the notable difference between the efficiency of the DOL-Start-PMa-SynRM and that of the IM. Consequently, is proved that an investment in the DOL-Start-PMa-SynRM may be feasible.

“…The efficient use of energy is one of the priorities in the sugar mills and has been classified into three groups: high efficiency mills (less than 450 kg 733 steam/ tons of cane), medium efficiency mills (between 450 and 600 kg steam/ tons of cane), and low efficiency mills (more than 600 kg steam/ tons of cane) [7]. Among the total energy demand in the industries, nearly 70% is consumed by motors [8]- [10], of these, 20 % drive pumps. Energy efficiency in pump systems can be improved between 5-50 % by proper maintenance, correct design an adequate control methods.…”

Section: Introductionmentioning

confidence: 99%

“…The energy saved annually considering a harvest of 130 days and 85% of non-stop use, is calculated as: (8) As the sugar mill is synchronized with the SEN and exports the surplus energy, the saving of electrical energy using the variable speed drive can be sold. Therefore, revenues are calculated according to the average sale price of electric power.…”

mentioning

confidence: 99%

Flow regulation at constant head in feedwater pumps in a sugar industry

Gómez

Sousa

Quintana

et al. 2019

Self Cite

In this paper the feasibility of energy saving by implementing flow regulation at constant load in feedwater pumps in a sugar industry is studied. As regulation strategy, the use of a variable speed drive in the hydraulic system is proposed. For the project evaluation, the Net Present Value and Payback Period techniques are used. Among the variables considered are the price of energy, the equipment useful life, financial data and those related to environmental impact. As a result, it was found that if only a commercial approach is considered, the energy saving strategy is profitable but not attractive, because investment is recovered in a period close to the useful life of technology. However, if a government focus that encourages the implementation of these energies saving strategies is considered, the investment of the project recovers in a short time.