Reduction of Starting Current in Large Induction Motors

Habyarimana, Mathew; Dorrell, David G.; Musumpuka, Remmy

doi:10.3390/en15103848

Cited by 3 publications

(1 citation statement)

References 37 publications

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“…The traditional approach to power factor correction in industrial applications involves installing capacitor banks with microcontrollers for switching synchronous capacitors [3]. The use of parallel capacitor compensation during switching on and start-up is effective in reducing the transient current in large induction motors [4]. But with the widespread use of non-linear loads such as variable speed drives, improving power factor has become more difficult.…”

Section: Introductionmentioning

confidence: 99%

Internal capacitive compensation of the reactive power of the screw electromechanical converter

Zablodskiy,

Chuenko,

Kovalchuk

et al. 2024

Electrical Engineering & Electromechanics

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Introduction. A special category among induction machines with a massive rotor is occupied by the class of multifunctional electromechanical energy converters, which are integrated with the links of technological processes Problem. The exchange of reactive energy between the source and the electromechanical converter during periods of operation with a low load leads to a significant decrease in its efficiency and power factor. With the use of non-linear loads and taking into account possible resonance, it has become more difficult to improve the power factor by installing capacitor banks. Goal. Increasing the energy indicators of the electromechanical converter by spatial displacement of the main and additional stator windings and internal capacitive compensation. Methodology. Comparative analysis of connection schemes and spatial arrangement of stator windings when using internal capacitive compensation. Modeling and experimental studies of electromagnetic and electromechanical characteristics of a screw electromechanical converter. Results. The distribution of electromagnetic quantities was established and the choice of the angle of spatial displacement of the main and additional windings of the stator phases of the modified converter, which ensure an increase in the value of the electromagnetic torque and power factor, was justified. The results of experimental studies of the screw electromechanical converter are presented. Originality. For the first time, a method of internal capacitive compensation of reactive power is proposed for multifunctional electromechanical converters of technological purpose. Practical value. The use of the proposed method of spatial displacement of the main and additional stator windings and internal capacitive compensation will ensure an increase in the energy performance of the screw electromechanical converter. References 23, tables 3, figures 15.

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Section: Introductionmentioning

confidence: 99%

Internal capacitive compensation of the reactive power of the screw electromechanical converter

Zablodskiy,

Chuenko,

Kovalchuk

et al. 2024

Electrical Engineering & Electromechanics

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Identification of Inrush Current Using a GSA-BP Network

2023

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Ensuring a stable and efficient transformer operation is a very crucial task nowadays, especially with the integration of modern and sensitive electrical equipment and appliances down the line. However, transformer maloperation still cannot be completely avoided, particularly with the existence of inrush current that possess similar characteristics as the fault currents when a fault occurred. Thus, this paper proposes an enhanced method for inrush current identification based on a backpropagation (BP) network, optimized using genetic and simulated annealing algorithms. The proposed method has the ability to find the global optimal solution while avoiding local optima, with increased solution accuracy and low calculation complexity. Through extensive simulations, it was found that the inrush and fault currents have differences in their harmonic contents, which can be exploited for the identification of those currents using the proposed identification method. The proposed genetic simulated annealing–BP (GSA-BP) algorithm make use of 200 current samples to improve the detection accuracy of the inrush current from 80% to 97.5%. Comparative studies performed against the existing identification methods show that the GSA-BP network has superior efficiency and accuracy while being practical for real-life application to improve the transformer protection system.

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The Effect of Tuned Compensation Capacitors in the Induction Motors

Habyarimana,

Sharma,

Bokoro

2024

Wseas Transactions on Power Systems

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The load switch-on surge current phenomenon is a key problem for remote loads generally connected to weak or stand-alone grids. This has been the main research topic in smart microgrids. A correlation exists between the motor load and the starting current since a motor usually needs a larger starting current to overcome inertia. Both the power needed to start the load and the higher reactive power demand during the starting procedure are at the origin of the increased current. The current decreases to the nominal value for the specific load gradually after the motor starts. This relationship is essential for figuring out the dimensions of electrical components and protecting the grid and motor from harm. Depending on the load, the switch-on surge current is greater than two to ten times the rated full load current. Energy storage systems can make up for the higher power needed to protect the load and the grid connection. It makes more sense to use tuned compensating capacitors to reduce the reactive power required to reduce the inrush current. The primary focus of this work is the selection, calculation, and switching of the capacitor bank for reactive power compensation. Following the previous research, in this paper, the smaller 2HP induction motor load is examined. The capacitances are calculated, turned on to offset the starting transient, and then disengaged once the machine reaches operating speed. This is done by using a point-on switching technique that lowers the switching transient.

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Reduction of Starting Current in Large Induction Motors

Cited by 3 publications

References 37 publications

Internal capacitive compensation of the reactive power of the screw electromechanical converter

Internal capacitive compensation of the reactive power of the screw electromechanical converter

Identification of Inrush Current Using a GSA-BP Network

The Effect of Tuned Compensation Capacitors in the Induction Motors

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