Mechanical Vibration Problems With Variable Frequency Drives

2000 ◽  
Author(s):  
Ralph Dickau ◽  
Lal Perera
Keyword(s):  
Mechanical Vibration ◽  
Variable Frequency ◽  
Inrush Current ◽  
Variable Speed ◽  
Pump Station ◽  
Variable Frequency Drives ◽  
Pipe Line ◽  
Vibration Problems ◽  
Lateral Resonance ◽  
Power Costs

Variable frequency drives are now frequently used to power large horsepower pipeline pumps to eliminate power costs wasted by throttling, to reduce inrush current on motor start, and to provide greater operating flexibility. This variable speed operation, however, can cause vibration problems in the pump and motor bearings, and in the couplings that are not normally experienced with fixed speed pumps. Enbridge Pipe Line has installed a number of variable frequency drives on units ranging from 2500 to 5000 hp in size and discovered unexpected torsional and lateral resonance vibration in the equipment at certain operating speeds. This presentation discusses the tests that were conducted to determine the source of the vibration, the theoretical analysis of the vibration modes and equipment responses, and the solutions that were implemented to reduce or eliminate the vibration. Recommendations are given for design principles that could be incorporated into the initial pump station design in order to avoid vibration problems with variable speed operation.

Establishing the “Fitness for Use Criteria” for Pipe Line Variable Frequency Drives

1996 ◽  
Author(s):  
Roy C. Spencer ◽  
Arnold Rivera
Keyword(s):  
Life Cycle ◽  
Current Source ◽  
Variable Frequency ◽  
Current Source Inverter ◽  
Technical Requirements ◽  
Start Up ◽  
Variable Frequency Drives ◽  
Pipe Line ◽  
Pump Stations ◽  
Operation Phase

“Fitness For Use”[1] criteria are used to define project quality. This paper documents how to establish the “Fitness For Use” criteria for pipe line variable frequency drives (VFD’s). A Pipe Line VFD project’s life cycle process together with the technical requirements” determine its “fitness for use”. Effective definition and management of these “life cycle requirements”, therefore ensures a quality result. In summary, this paper documents how the “Fitness For Use Criteria” methodology was successfully used on the IPL Capacity Expansion Program to: (a) establish the project process; (b) engineer, procure, construct, commission and start-up the VFD systems; and (c) carry out training plus technically support the pipe line’s early operation phase. The Canadian section of IPL’s Line 13 is powered by eight pump stations containing five 3750 hp and three 6250hp, current source inverter (CSI)[2] based VFDs; this equipment was installed and commissioned in 1994, and has been in operation for 18 months.

Опыт использования частотных преобразователей на объектах ООО «Водоканал»

2020 ◽  
Author(s):  
Sergei, Rybel’ ◽  
V. Kuninin ◽  
S. Gerasimov ◽  
A. Bakushin
Keyword(s):  
Inrush Current ◽  
Electric Motors ◽  
Variable Speed ◽  
Variable Speed Drives ◽  
Technical Device ◽  
Advantages And Disadvantages ◽  
Subsequent Period ◽  
Pumping Stations ◽  
Current Water ◽  
Pumping Equipment

Приведен опыт применения частотно-регулируемых электроприводов на насосных станциях ООО Водоканал г. Новокузнецка. Приводятся преимущества и недостатки данного технического устройства. Показано, что в настоящее время использование частотно-регулируемых приводов позволило снизить потребление электроэнергии более чем на 20, уменьшить затраты на ремонт и обслуживание, повысить срок службы электродвигателей, уменьшить величину пускового тока, снизить утечки воды и нагрузку на насосное оборудование и трубопроводную арматуру. Применение частотно-регулируемых электроприводов оправдало себя и в тех случаях, когда требуется регулирование параметров для обеспечения технологии (регулирование скорости, производительности и т. д.), приведение параметров оборудования к требуемым значениям без его замены (в расчете на увеличение загрузки оборудования до номинала в последующий период), компенсация суточной неравномерности потребления воды.The experience of using variable speed drives at the pumping stations operated by Vodokanal LLC in Novokuznetsk is presented. The advantages and disadvantages of this technical device are specified. It is demonstrated that currently, the use of variable speed drives provides for reducing the energy consumption by more than 20, reducing the repair and maintenance costs for improving the service life of electric motors for reducing inrush current, water leaks and the load on the pumping equipment and pipeline valving. The use of variable speed drives has paid off even in case where adjusting the parameters to ensure the technology (velocity, performance, etc.) bringing the equipment parameters to the required values without replacing it (in order to increase the equipment load to the nominal value for the subsequent period) compensating for daily irregularities in water consumption are required.

scholarly journals A Concise Review of Control Techniques for Reliable and Efficient Control of Induction Motor

2018 ◽  
Vol 9 (3) ◽  
pp. 1124
Author(s):  
Abdullah Alwadie
Keyword(s):  
Induction Motor ◽  
Research Work ◽  
Optimization Techniques ◽  
Future Research ◽  
Variable Frequency ◽  
Control Techniques ◽  
Control Scheme ◽  
Control Schemes ◽  
Variable Frequency Drives ◽  
And Performance

<span style="color: black; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: SimSun; mso-themecolor: text1; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;">Induction motors are work-horse of the industry and major element in energy conversion. The replacement of the existing non-adjustable speed drives with the modern variable frequency drives would save considerable amount of electricity. A proper control scheme for variable frequency drives can enhance the efficiency and performance of the drive. This paper attempt to provide a rigorous review of various control schemes for the induction motor control and provides critical analysis and guidelines for the future research work. A detailed study of sensor based control schemes and sensor-less control schemes has been investigated. The operation, advantages, and limitations of the various control schemes are highlighted and different types of optimization techniques have been suggested to overcome the limitations of control techniques</span>

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