scholarly journals Development of a stand for researching electric drives of pumping units

Vestnik MGTU ◽  
2020 ◽  
Vol 23 (4) ◽  
pp. 364-375
Author(s):  
A. N. Tsvetkov ◽  
V. Yu. Kornilov ◽  
A. R. Safin ◽  
N. E. Kuvshinov ◽  
T. I. Petrov ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Electric Motor ◽  
Frequency Converter ◽  
Electric Motors ◽  
Electric Drives ◽  
Sucker Rod ◽  
Pumping Unit ◽  
Pumping Units ◽  
Efficiency And Reliability ◽  
Asynchronous Electric Motor

In the modern oil industry, the vast majority of oil production units are represented by sucker rod pumping units, driven mainly by asynchronous electric motors without using any monitoring, control and regulation means. Studies carried out on such installations show their low energy efficiency and reliability. Therefore, the issue of developing complex electric drives of a new generation based on the use of synchronous valve electric motors is relevant allowing to significantly increase the energy efficiency and reliability of both individual installations and to ensure the creation of "smart" oil field control systems. The paper discusses new technical solutions of the experimental stand which makes it possible to study the energy characteristics of electric drives based on asynchronous and synchronous valve electric motors, as well as allowing to create conditions as close as possible to real field conditions with imitation of the operation of an oil pumping unit of a sucker rod pumping unit. In modern test equipment systems, devices are often used to create a mechanical load on the shaft of the electric motor under study. The system proposed and implemented as such a device is "a frequency converter - load asynchronous electric motor", which has been tested on a stand and has proven to be the best in comparison with traditional circuits using DC motors. But using of a load asynchronous electric motor as part of the test stand has revealed a number of disadvantages: overheating of the electric motor operating in the opposing mode, low accuracy of creating the load torque and the speed of the system's response. The problem of overheating of the load electric motor has been solved by transferring the frequency converter to the direct torque control mode, while a significant decrease in the motor current and stabilization of the temperature regime have been detected. The low accuracy and response speed of the system have been increased by introducing feedback and a PID controller into the stand control system.

Comparison of Energy Indicators of the Electric Lift Drive of the Ekg-5 Excavator with Different Power Converters

2021 ◽  
Vol 64 (3) ◽  
pp. 53-59
Author(s):  
Eduard Grekov ◽  
◽  
Alexei Bezgin ◽  
Viktor Sorokin ◽  
Ildar Yamansarin ◽  
...  
Keyword(s):  
Electric Motor ◽  
Power Converters ◽  
Frequency Converter ◽  
Electric Motors ◽  
Joint Work ◽  
Two Phase ◽  
Electric Drives ◽  
Three Phase ◽  
Energy Indicators ◽  
Asynchronous Electric Motor

The energy indicators of the EKG-5 excavator lifting electric drive with thyristor power circuits have been determined according to the systems thyristor direct frequency converter - two-phase asynchronous electric motor, converter-DC motor and direct frequency converter - three-phase asynchronous electric motor. Losses in electric motors and converters have been determined, taking into account the specifics of their joint work in theefficiency for the excavation cycle were determined based on the results of calculating the simulation model, the initial data for which were the parameters of the excavation cycle of the lift drive of a real excavator. Distortion coefficients of the mains current were determined for two cases: during digging and during accelerated lowering of an empty bucket. For comparison, the energy indicators of the selected electric drives with a filter-compensating device were calculated. The analysis of energy indicators is made.

Research of Load Unbalance of a Two- Motor Variable Frequency Dtive for Scraper Conveyor

2021 ◽  
Vol 64 (4-5) ◽  
pp. 37-45
Author(s):  
Dmitry Shprekher ◽  
◽  
Gennady Babokin ◽  
Evgeny Kolesnikov ◽  
Dmitry Ovsyannikov ◽  
...  
Keyword(s):  
Load Balancing ◽  
Electric Motor ◽  
Frequency Converter ◽  
Common Type ◽  
Single Frequency ◽  
Variable Frequency ◽  
Electric Motors ◽  
Electric Drives ◽  
Scraper Conveyor ◽  
Simulation Results

The article analyzes the uneven loading of the scraper conveyor electric motors. The most common type of multi-motor conveyor is considered here: two-drive, with head and end drives connected through gearboxes and sprockets by an endless chain with scrapers. The simulation results are presented for three variants of com-binations of parameters of electric drives. It has been established that the use of a two-motor variable frequen-cy drive of a scraper conveyor powered by a single frequency converter inevitably entails uneven loading of the electric motors of the head and end drives. To eliminate this disadvantage, it is proposed to supply each electric motor from its own frequency converter. A system of automatic load balancing is proposed. The implementation and the result of the work of the load balancing system are carried out on a model in the Matlab / Simulink system.

ANALYSIS OF THE OPERATION OF PUMPING UNIT UNDER A RANGE OF DIFFERENT LOADS

2019 ◽  
pp. 263-267
Author(s):  
Antoaneta Dimitrova
Keyword(s):  
Electric Motor ◽  
Energy Efficient ◽  
Frequency Converter ◽  
Hot Water ◽  
Maximum Efficiency ◽  
Pump Unit ◽  
Start Up ◽  
Different Types ◽  
Pumping Unit ◽  
Pumping Units

The report analyzes the work of a pumping unit from the hot water installation of the Faculty of Technics and Technologies - Yambol, Bulgaria, under different load conditions. Simulation stands have been adapted that are suitable for analyzing the performance of motors of different types and depending on how they are put into the pump unit. It was found that when the energy inefficient electric motor is directly started, the maximum efficiency is 79,63% and is achieved at 100% of its load. When using a frequency converter, at 100% of its load, the efficiency is 86,83%. The proposed energy-efficient electric motor, with direct start-up, has the highest efficiency of 86,7%. The obtained results can be used in the modernization of the hot water installation of the Faculty of technics and Technologies - Yambol, in the part “pumping units”.

scholarly journals Insulation Life Span of Low-Voltage Electric Motors—A Survey

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1738
Author(s):  
Vanessa Neves Höpner ◽  
Volmir Eugênio Wilhelm
Keyword(s):  
Life Span ◽  
Electric Motor ◽  
Low Voltage ◽  
Frequency Converter ◽  
Rate Of Change ◽  
High Rate ◽  
Switching Frequency ◽  
Electric Motors ◽  
Frequency Converters ◽  
High Switching Frequency

The use of static frequency converters, which have a high switching frequency, generates voltage pulses with a high rate of change over time. In combination with cable and motor impedance, this generates repetitive overvoltage at the motor terminals, influencing the occurrence of partial discharges between conductors, causing degradation of the insulation of electric motors. Understanding the effects resulting from the frequency converter–electric motor interaction is essential for developing and implementing insulation systems with characteristics that support the most diverse applications, have an operating life under economically viable conditions, and promote energy efficiency. With this objective, a search was carried out in three recognized databases. Duplicate articles were eliminated, resulting in 1069 articles, which were systematically categorized and reviewed, resulting in 481 articles discussing the causes of degradation in the insulation of electric motors powered by frequency converters. A bibliographic portfolio was built and evaluated, with 230 articles that present results on the factors that can be used in estimating the life span of electric motor insulation. In this structure, the historical evolution of the collected information, the authors who conducted the most research on the theme, and the relevance of the knowledge presented in the works were considered.

scholarly journals Computer Modeling of Pumping Station with Unregulated Electric Drive

2020 ◽  
Vol 220 ◽  
pp. 01039
Author(s):  
Shakhboz Dadabaev ◽  
Elena Gracheva
Keyword(s):  
Electric Drive ◽  
Electromagnetic Torque ◽  
Electric Motors ◽  
Motor Speed ◽  
Electric Drives ◽  
Pumping Station ◽  
Soft Start ◽  
Soft Starter ◽  
Pumping Units ◽  
Static Torque

The results of the analysis of transient and technological processes of the irrigation pumping station of the first lift, taking into account the negative starting effects on the synchronous electric drive, are considered. The analysis and review of the ways of regulating the performance of the units of the irrigation pumping station of the first lift are made, and the main difficulties of the existing methods of regulating the pump supply are revealed. Computer simulation of starting modes of high-voltage synchronous electric motors with direct and soft start, where soft starter was used for soft start, was carried out. The simulation took into account the changes in the currents of all phases of the electric motor, the electromagnetic torque, the motor speed, the effective value of the current, as well as the static torque. The introduction of semiconductor soft starters for electric drives of high-power pumping units has been substantiated.

scholarly journals The change in the efficiency factor of the pumping unit with a frequency converter

2019 ◽  
Vol 97 ◽  
pp. 05010 ◽  
Author(s):  
Eduard Kan ◽  
Nazir Ikramov ◽  
Muradulla Mukhammadiev
Keyword(s):  
Economic Efficiency ◽  
Water Pressure ◽  
Frequency Converter ◽  
Pump Efficiency ◽  
Test Bed ◽  
Speed Up ◽  
Pump Shaft ◽  
Pumping Unit ◽  
Parameter Measuring ◽  
Pumping Units

This paper gives the results of the investigation of the operation of a pumping unit equipped with a frequency converter. As a rule, it is widely assumed that when changing the speed up to 50 %, the pump efficiency almost does not change, and the possibility of decrease of its efficiency is not taken into consideration when calculating the economic efficiency of the operation of the pumping unit equipped with a frequency converter. However, failure to take account the efficiency decrease may cause inaccurate assessment of the economic efficiency of the use of the frequency converter and, consequently, improper selection of the method of control of the operation of the pumping units. This is particularly important for irrigation pumping plants the operation of which is characterized by large volume of the pumpable volume and less severe requirements for provision of the water pressure required for the consumer. The purpose of this paper is to carry out experiments on a test-bed equipped with a pumping unit, parameter measuring instrument, and a frequency converter, and detection of the pattern of efficiency variation with speed. The paper presents the results of the carried out experiments, the obtained characteristic curves of the variation of different types of the efficiency at variation of the pump shaft speed, as well as their analysis.

Design and Analysis of Hydraulic Pumping Units

2007 ◽  
Author(s):  
Guixi Li ◽  
Rujian Ma ◽  
Jungang Wang
Keyword(s):  
Dynamic Response ◽  
Head Movement ◽  
Dynamic Stress ◽  
Dynamic Performance ◽  
The Other ◽  
Mechanical Vibrations ◽  
Maximum Displacement ◽  
Sucker Rod ◽  
Pumping Unit ◽  
Pumping Units

The dynamic performance of hydraulic beam pumping units was analyzed in this paper by using the theory of mechanical vibrations. The house-head movement of the pumping unit is mainly uniform, except the alternation period of upper- and down-strokes. Under the action of the house-head movement, the vibration of the system, the sucker-rod and, furthermore, the dynamic stress will be induced. The results indicate that the movement of the downhole pump includes two parts. One is the movement following the horse-head. The other is the dynamic response excited by the support movement. When the parameters of the system are selected reasonably, over-stroke of the pump will appear. This is because the movement of the hydraulic piston obeys a particular law. The maximum displacement increases, and the maximum dynamic stress decreases with depth. The changing of maximum dynamic stress with depth obeys quadratic law.

scholarly journals ANALYSIS OF THE OPERATING MODES OF THE SUSPENDED CABLE CAR ELECTRIC DRIVE USING THE VECTOR CONTROL SYSTEM

2021 ◽  
Vol 2021 (58) ◽  
pp. 39-43
Author(s):  
M.V. Pechenik ◽  
◽  
S.O. Burian ◽  
H.Y. Zemlianukhina ◽  
D.V. Rudniev ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Electric Drive ◽  
Dynamic Error ◽  
Transport Systems ◽  
Energy Losses ◽  
Electric Drives ◽  
Operating Modes ◽  
Suspended Cable ◽  
Vector Control System ◽  
Asynchronous Electric Motor

Continuous transport systems, including rope conveyors designed to move people and goods, are subject to very strict safety and energy efficiency requirements. As a rule, suspended cableways in operation have an unregulated electric drive with a smooth start system. Among the ways to meet these requirements is the use of modern regulated electric drives. The electromechanical system with a vector-controlled asynchronous electric motor is considered in the work. Based on the obtained model, within the framework of the MATLAB / Simulink application package, an investigation of the dynamic characteristics of the cableway electric drive was carried out. An analysis of the nature of the distribution of dynamic error in terms of speed and energy losses depending on the load and speed of movement of the rope traction element of the transport system is given. The results presented in the article make it possible to choose rational electric drives for continuous transport systems with rope traction elements. References 5, figures 5, table.

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