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The paper discusses the use of the combined control for a system of two parallel pumps to increase its service life. Using the combined control, the pumping system is controlled together by change the speed, throttling, and bypass. The power consumption of the pumping system is calculated for three methods of flow control: with minimum energy consumption, with maximum reliability, and control with a trade-off between efficiency and reliability. In the case of control with maximum reliability, the energy consumption of the pumping system is higher than in the case of control with minimum energy consumption by 29.2%. In the case of the proposed trade-off control, which provides acceptable reliability, the power consumption is higher than with the minimum energy consumption control by only 7.3%.
Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. Increasing Service Life and System Efficiency of Parallel Pumps Using Combined Pump Regulation. Water 2021, 13, 1808 .
AMA StyleSafarbek Oshurbekov, Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii. Increasing Service Life and System Efficiency of Parallel Pumps Using Combined Pump Regulation. Water. 2021; 13 (13):1808.
Chicago/Turabian StyleSafarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. 2021. "Increasing Service Life and System Efficiency of Parallel Pumps Using Combined Pump Regulation." Water 13, no. 13: 1808.
Reliability, along with energy efficiency, is an important characteristic of pump units in various applications. In practical pump applications, it is important to strike a balance between reliability and energy efficiency. These indicators strongly depend on the applied control method of the pump unit. This study analyzes a trade-off method for regulating a system with three parallel pumps equipped with only one frequency converter (multi-pump single-drive system). A typical operating cycle of a pumping system with variable flow rate requirements is considered. The proposed trade-off method is compared with the traditional regulation, when a change in the operating point of the pump is achieved only by changing the rotation speed, and with the method for maximum reliability. It is shown that the proposed trade-off method makes it possible to ensure sufficient reliability of the multi-pump system operation without a significant increase in energy consumption.
Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. Improving Reliability and Energy Efficiency of Three Parallel Pumps by Selecting Trade-Off Operating Points. Mathematics 2021, 9, 1297 .
AMA StyleSafarbek Oshurbekov, Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii. Improving Reliability and Energy Efficiency of Three Parallel Pumps by Selecting Trade-Off Operating Points. Mathematics. 2021; 9 (11):1297.
Chicago/Turabian StyleSafarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. 2021. "Improving Reliability and Energy Efficiency of Three Parallel Pumps by Selecting Trade-Off Operating Points." Mathematics 9, no. 11: 1297.
The energy efficiency of a multi-pump system consisting of two low-power (0.75 kW) pumps operating in parallel mode and a single-pump mechanism (1.5 kW) is compared in this study. For this purpose, mathematical models, experimental data, and data retrieved from the manuals provided by the pump manufacturers are used. The single-pump system is fed by a single variable speed drive. A multi-pump system running in parallel mode consists of two pumps. One of them is driven by an induction motor connected directly to the electrical grid and equipped with a throttle. Another pump is actuated by an induction motor fed by a variable speed drive. The flowrate of the liquid in the multi-pump is controlled with the help of speed variation and throttling. In the case of the single-pump system the conventional speed control method is applied during the analysis. For both pump system topologies, the daily and annual energy consumption is obtained. As a result of conducted calculations, it was shown that the multi-pump provides 29.8% savings in comparison to the single-pump system in the case of a typical flowrate profile.
Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Levon Gevorkov. Energy Consumption Comparison of a Single Variable-Speed Pump and a System of Two Pumps: Variable-Speed and Fixed-Speed. Applied Sciences 2020, 10, 8820 .
AMA StyleSafarbek Oshurbekov, Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii, Levon Gevorkov. Energy Consumption Comparison of a Single Variable-Speed Pump and a System of Two Pumps: Variable-Speed and Fixed-Speed. Applied Sciences. 2020; 10 (24):8820.
Chicago/Turabian StyleSafarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Levon Gevorkov. 2020. "Energy Consumption Comparison of a Single Variable-Speed Pump and a System of Two Pumps: Variable-Speed and Fixed-Speed." Applied Sciences 10, no. 24: 8820.
The paper presents a comparative analysis of life-cycle energy consumption for three different types of 4 kW line-start motors used in a pump unit with throttling: the most widely used induction motor with IE3 efficiency class, line start permanent magnet synchronous motor with IE4 efficiency class and line start synchronous reluctance motor with IE4 efficiency class. The operating cycle for pump units with constant flow is considered for the above-mentioned types of motors taking into account not only the losses in the pump and motor, but also in the power supply cable. It is shown that the line start synchronous reluctance motor without magnets has the highest efficiency over the entire considered loading range. However, its power factor is lower than that of the synchronous motor with magnets and therefore it has more significant losses in power supply cable. Despite this disadvantage, the line-start reluctance motor is a good alternative to widespread induction motor since it allows saving of approximately 4000 euro more than the latter during the 20 years life cycle. It also provides similar savings in comparison to the permanent magnet synchronous motor, but unlike it, it does not have costly rare-earth materials in the rotor.
Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Safarbek Oshurbekov; Dmitry Golovanov. Life Cycle Energy Cost Assessment for Pump Units with Various Types of Line-Start Operating Motors Including Cable Losses. Energies 2020, 13, 3546 .
AMA StyleVadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii, Safarbek Oshurbekov, Dmitry Golovanov. Life Cycle Energy Cost Assessment for Pump Units with Various Types of Line-Start Operating Motors Including Cable Losses. Energies. 2020; 13 (14):3546.
Chicago/Turabian StyleVadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Safarbek Oshurbekov; Dmitry Golovanov. 2020. "Life Cycle Energy Cost Assessment for Pump Units with Various Types of Line-Start Operating Motors Including Cable Losses." Energies 13, no. 14: 3546.
The paper presents a comparative analysis of energy consumption by 2.2 kW electric motors of various types and energy efficiency classes in the electric drive of a pump unit with throttle control in a water supply system. Line-start permanent-magnet synchronous motors of the IE4 energy efficiency class and induction motors of the IE4 and IE3 energy efficiency classes of various manufacturers were considered (IE4 and IE3 are labels of energy efficiency classes of electric motors according to IEC 60034-30-1 standard). Energy consumption at a hydraulic load changing under a typical duty cycle was calculated based on the nameplate data of the pump and electric motors. The developed method shows that selecting an electric motor based on the IE energy efficiency class under the IEC 60034-30-1 standard (i.e., based on efficiency at a rated load) may not provide the minimum energy consumption of a variable flow pump unit over a typical duty cycle. In particular, the considered IE4 class line-start permanent-magnet synchronous motors do not provide significant advantages over IE4 class induction motors, and sometimes even over IE3 class induction motors when they are used in variable flow pump units.
Victor Goman; Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. Energy Efficiency Analysis of Fixed-Speed Pump Drives with Various Types of Motors. Applied Sciences 2019, 9, 5295 .
AMA StyleVictor Goman, Safarbek Oshurbekov, Vadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii. Energy Efficiency Analysis of Fixed-Speed Pump Drives with Various Types of Motors. Applied Sciences. 2019; 9 (24):5295.
Chicago/Turabian StyleVictor Goman; Safarbek Oshurbekov; Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii. 2019. "Energy Efficiency Analysis of Fixed-Speed Pump Drives with Various Types of Motors." Applied Sciences 9, no. 24: 5295.
A single-phase flux reversal machine (FRM) has many advantages in high-speed applications because of its simple and reliable rotor structure without magnets or winding, simple and cheap concentrated stator windings, high efficiency, and power density. However, the major problem of single-phase motors is the high torque ripple, which shortens their lifetime and causes noise and vibrations, not only in the machine, but also in the mechanisms coupled therewith. This paper presents a novel three-phase machine consisting of three single-phase machines, having a common shaft aiming to reduce the torque ripple and to improve motor behavior. In this paper, the mathematical model of the single-phase flux reversal motor, as well as the conversion procedure of the single-phase motor parameters to the three-phase ones, is considered. Furthermore, an optimization procedure of the motor and choosing the optimization objectives are done. The finite element two-dimensional (2D) method is used to simulate the machine and to show the results.
Vladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev; Safarbek Oshurbekov; Mohamed N. Ibrahim. Optimal Design of a Novel Three-Phase High-Speed Flux Reversal Machine. Applied Sciences 2019, 9, 3822 .
AMA StyleVladimir Prakht, Vladimir Dmitrievskii, Vadim Kazakbaev, Safarbek Oshurbekov, Mohamed N. Ibrahim. Optimal Design of a Novel Three-Phase High-Speed Flux Reversal Machine. Applied Sciences. 2019; 9 (18):3822.
Chicago/Turabian StyleVladimir Prakht; Vladimir Dmitrievskii; Vadim Kazakbaev; Safarbek Oshurbekov; Mohamed N. Ibrahim. 2019. "Optimal Design of a Novel Three-Phase High-Speed Flux Reversal Machine." Applied Sciences 9, no. 18: 3822.
Due to the rapid increase in the number of variable speed AC drives, the analysis of their energy efficiency has become highly essential. However, such an analysis requires consideration of a wide variety of factors. This includes considering the energy loss in the frequency converter, depending on the motor type. In this article, a computational comparison of the energy properties of variable frequency pump drive employing two types of electric machines, i.e. an induction and a synchronous reluctance motor, is presented. The effect of the motor type on the losses in a low-voltage two-stage frequency converter using analytical and numerical models, with a further comparison, is investigated. Furthermore, an alternative approach to determine the current magnitude and power factor of the load of the converter is suggested. Eventually, this study provides a quantitative estimate of the increase in losses in the converter caused by using the two different motor types. Several experimental tests are conducted on induction and synchronous 1.1 kW reluctance motors.
Vadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Mohamed N. Ibrahim; Safarbek Oshurbekov; Sergey Sarapulov. Efficiency Analysis of Low Electric Power Drives Employing Induction and Synchronous Reluctance Motors in Pump Applications. Energies 2019, 12, 1144 .
AMA StyleVadim Kazakbaev, Vladimir Prakht, Vladimir Dmitrievskii, Mohamed N. Ibrahim, Safarbek Oshurbekov, Sergey Sarapulov. Efficiency Analysis of Low Electric Power Drives Employing Induction and Synchronous Reluctance Motors in Pump Applications. Energies. 2019; 12 (6):1144.
Chicago/Turabian StyleVadim Kazakbaev; Vladimir Prakht; Vladimir Dmitrievskii; Mohamed N. Ibrahim; Safarbek Oshurbekov; Sergey Sarapulov. 2019. "Efficiency Analysis of Low Electric Power Drives Employing Induction and Synchronous Reluctance Motors in Pump Applications." Energies 12, no. 6: 1144.