scholarly journals Advanced Control of a Compensator Motor Driving a Variable Speed Diesel Generator with Rotating Stator

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2224
Author(s):  
Mohammadjavad Mobarra ◽  
Bruno Tremblay ◽  
Miloud Rezkallah ◽  
Adrian Ilinca
Keyword(s):  
Diesel Engine ◽  
Asynchronous Motor ◽  
Operating Conditions ◽  
Variable Frequency ◽  
Variable Speed ◽  
Diesel Generator ◽  
Variable Frequency Drive ◽  
Advanced Control ◽  
Optimal Value ◽  
Processor Board

Variable speed generators can improve overall genset performance by allowing the diesel engine to reduce its speed at lower loads. In this project, a variable speed diesel generator (VSDG) uses a rotating stator driven by a compensator motor. At lower loads, the stator turns in the opposite direction of the rotor, a process that can be used for purposes like maintaining a fixed relative speed between the two components of a generator. This allows the diesel engine to turn at a lower speed (same as the rotor) and to increase its efficiency. The present research addresses the control of the compensator motor driving the generator’s stator using a variable-frequency drive that adapts the speed to its optimal value according to the load. The performance of the proposed control strategy was tested using a Freescale microcontroller card programmed in C-code to determine the appropriate voltage for the variable-frequency drive. The control algorithm uses a real-time application implemented on an FDRM-KL25Z signal processor board. The control performance of a 2 kW asynchronous motor (LabVolt EMS 8503-00/208 V/3 ϕ/60(50) Hz) was demonstrated experimentally at different operating conditions.

Research on Multi-Speed Control of Variable-Frequency Drive

2014 ◽  
Vol 538 ◽  
pp. 425-428
Author(s):  
Xiao Na Song
Keyword(s):  
Previous Experiment ◽  
Speed Control ◽  
Variable Frequency ◽  
Variable Speed ◽  
Variable Frequency Drive ◽  
Experimental Teaching ◽  
Three Phase ◽  
Speed Mode ◽  
Plc Program

This paper introduces a noval experimental teaching project. Different from previous experiment, in this project, three-phase motor can operate at multi-speed mode or continuously variable speed mode controlled by PLC and VFD. The obvious characteristic of the experiment is that the VFD is controlled by PLC automatically. The configuration of the experiment including hardware and software is introduced in detail. The results of the execuation of the PLC program reveals that three-phase motor can operate in two modes according to the instructions from PLC. In addition, the speed can be changed with the corresponding parameters seting. Therefore, the knowledge of PLC and VFD are combined in one teaching project, through which student can master more practical technique. The work of this paper is significant for improving the students’ comprehensive capability.

scholarly journals IMPLEMENTASI PENGATUR KECEPATAN MOTOR PADA MESIN CONVEYOR PENYORTIR LOGAM OTOMATIS

2020 ◽  
Vol 6 (1) ◽  
pp. 32
Author(s):  
Mindit Eriyadi ◽  
Indra Maryana Lesmana Putra
Keyword(s):  
Induction Motor ◽  
Variable Frequency ◽  
Programmable Logic ◽  
Prime Mover ◽  
Variable Speed ◽  
Digital Output ◽  
Variable Frequency Drive ◽  
Logic Control ◽  
Programmable Logic Control ◽  
Speed Parameter

Metal sorting conveyor is a device that is used to separate metal and non-metal objects, the drive of this conveyor uses ½ Horse Power (HP) induction motor as its prime mover. To adjust the rotation of the induction motor 1 HP Variable Frequency Drive (VFD) is used. This VFD is set with the double speed parameter so that later the motor can rotate variably in two speeds. The input parameters of the VFD itself use switches in the form of photo electric and inductive proximity which are controlled automatically using Programmable Logic Control (PLC). The digital output of the PLC will then communicate with the digital input of the VFD so that when the object on the conveyor is detected by a photoelectric, the VFD will adjust the frequency by 8,5 Hz, if the object on the conveyor is detected by metal by inductive proximity, the VFD will set the frequency by 14,5Hz . So that at each of these frequencies the motor can rotate with speeds of 241,5 rpm and 359,5 rpm. The results of the trials carried out show that VFD can regulate in a number of speeds in a variable manner, but in this study limited to using two speeds or double speed as a variable speed experiment.

Cost Effective Automatic Garage Door Mechanism With Variable Speed

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Yuvraj Prajapati ◽  
Shrey Patel ◽  
Monark Shah ◽  
Raj Chokshi ◽  
Om Prakash Shukla
Keyword(s):  
Mechanical System ◽  
Cost Effective ◽  
Industrial Applications ◽  
Variable Frequency ◽  
Variable Speed ◽  
Electrical System ◽  
Variable Frequency Drive ◽  
Mechanical Part ◽  
Day By Day ◽  
At Home

The aim of our project is to provide safety as well as security to people from the largest electromechanical objects which are available at home. An automatic garage door mechanism was selected as a subject of our research as it is the complex electro-chemical object at home. As technology increases day by day every households installs this automatic garage door mechanism. The major problem with the conventional garage door system was child entrapment and people are in wheelchair are also affected by the conventional garage door mechanism. We are planning to eliminate the problems which are available in the conventional garage door mechanism by providing some extra safety and security features to our automatic garage door mechanism.an automatic garage door mechanism is the combination of mechanical and electrical system in which mechanical system guides the system as well as direct the shutter movement While, electrical system is used to provide energy to mechanical part. Sectional overhead doors have become the standard door type for garages. Our motive behind this study is to increase the safety and security of the automatic garage doors as well as make it to operatable at variable speed. Safety of the equipment is going to be increased by an area presence sensor which will reduce the child entrapment cases. Only authorized people can access the garage, that will increase the security and use of the VFD-variable frequency drive will make the garage door operatable at owner desired working speed. These shutters can be used for home applications as well as industrial applications.

Effect of Vibrations on the Performance of a Centrifugal Pump-Impeller When Using a Variable Frequency Drive

2016 ◽  
Author(s):  
G. Lara-Rodriguez ◽  
O. Begovich ◽  
J. L. Naredo
Keyword(s):  
Centrifugal Pump ◽  
Incidence Angle ◽  
Operating Conditions ◽  
Rapid Decline ◽  
Variable Frequency ◽  
Liquefied Petroleum Gas ◽  
Or Efficiency ◽  
Pump Impeller ◽  
Variable Frequency Drive ◽  
Partial Load

This paper deals with turbomachinery, such as pumps or turbines, which are very sensitive to changes in fluid speed over the contours of the blades when the volumetric flow is varied. These changes modify the fluid incidence angle, causing a rapid decline in pump performance. Our research focuses on an analysis of the performance or efficiency of a centrifugal pump with a variable frequency drive, where losses in efficiency are caused by turbulence generating harmful vibrations in the installation. The methodology consists of measuring the magnitude of the vibrations. The data obtained are compared to the performance reached when the change in velocity has been produced with the regulation of the volumetric flow to a partial load of the pump. This suggests an analysis to attempt to resolve the issue of density variation that occurs when pumping liquefied petroleum gas (LPG) under regular operating conditions.

scholarly journals Improving power efficiency of underloaded pipelines with variable frequency drives

2020 ◽  
Vol 4 (1) ◽  
pp. 4-9
Author(s):  
Pavel A. Revel-Muroz ◽  
◽  
Georgy N. Matveev ◽  
Leonid M. Bekker ◽  
Konstantin Y. Shtukaturov ◽  
...  
Keyword(s):  
Power Consumption ◽  
Energy Saving ◽  
Power Efficiency ◽  
Electric Energy ◽  
Operating Conditions ◽  
Main Line ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Trunk Pipeline ◽  
Variable Frequency Drives

The paper considers the option to reduce power consumption in the operation of the underloaded trunk pipeline by engaging additional pump units with lower rotor r.p.m. control using variable frequency drive. Under these conditions, the operating point of the pumps (delivery rate, head) approaches to the rated output, thus increasing the efficiency of the pumps and decreasing the electricity power consumption for pumping operations. The paper presents comparative calculations of operating conditions for a section of the trunk pipeline with a specified pumping capacity of 35 million t/year (60 % of the design load) when one, two and three main line pumps with variable frequency drives are engaged. The power consumption for pumping is calculated using the dependence of the variable frequency drive and motor efficiencies on the electric motor load and rotational speed. Based on the results of calculations, the electric energy saving is determined when additional pumping units are engaged. The experience has shown that when the second main line pump was engaged, the electric energy saving for pumping was 3.7% compared to the condition with one pump running. However, if the third pump is engaged, the saving is only 1.9 % – the decrease is due to lower motor and variable frequency drive efficiencies in the underloaded condition.

scholarly journals Variable Speed Diesel Generators: Performance and Characteristic Comparison

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 592
Author(s):  
Mohammadjavad Mobarra ◽  
Miloud Rezkallah ◽  
Adrian Ilinca
Keyword(s):  
Diesel Engine ◽  
Performance Appraisal ◽  
Energy Demand ◽  
Ghg Emissions ◽  
Variable Speed ◽  
Diesel Generator ◽  
Remote Areas ◽  
Low Load ◽  
Diesel Generators ◽  
Electric Loads

Diesel generators (DGs) are set to work as a backup during power outages or support the load in remote areas not connected to the national grid. These DGs are working at a constant speed to produce reliable AC power, while electrical energy demand fluctuates according to instantaneous needs. High electric loads occur only for a few hours a day in remote areas, resulting in oversizing DGs. During a low load operation, DGs face poor fuel efficiency and condensation of fuel residues on the walls of engine cylinders that increase friction and premature wear. One solution to increase combustion efficiency at low electric loads is to reduce diesel engine (DE) speed to its ideal regime according to the mechanical torque required by the electrical generator. Therefore, Variable Speed Diesel Generators (VSDGs) allow the operation of the diesel engine at an optimal speed according to the electrical load but require additional electrical equipment and control to maintain the power output to electrical standards. Variable speed technology has shown a significant reduction of up to 40% fuel consumption, resulting in low GHG emissions and operating costs compared to a conventional diesel generator. This technology also eliminates engine idle time during a low load regime to have a longer engine lifetime. The main objective of this survey paper is to present the state of the art of the VSDG technologies and compare their performance in terms of fuel savings, increased engine lifetime, and reduced greenhouse gases (GHG) emissions. Various concepts and the latest VSDG technologies have been evaluated in this paper based on their performance appraisal and degree of innovation.

Improving Energy Efficiency of the Variable Frequency Drive of the Forced-Draught Fan with the Two-Speed Asynchronous Motor

2015 ◽  
Vol 792 ◽  
pp. 128-133 ◽  
Author(s):  
Ekaterina A. Khramshina ◽  
Alexander S. Karandaev ◽  
Rifkhat R. Khramshin
Keyword(s):  
Electric Drive ◽  
Frequency Control ◽  
Asynchronous Motor ◽  
Energy Performance ◽  
Hot Water ◽  
Control Mode ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Low Speed ◽  
Variable Frequency Control

Based on the example of forced-draught fans of the GOFHWB-100 series hot water boilers (gas and oil fired hot water boilers) power supply reserves of the electric drive with two-speed asynchronous motor have been determined. The structural chart of the developed control system of the electric drive with winding changeover depending on the boiler performance is provided. The paper considers power consumption of electric drive in the variable frequency speed control mode at the motor operation on the high and low speed windings. It presents methods for calculation of energy performance based on computing the equivalent efficiency of the fluid-handling application. The analysis of the efficiency change has proved that the variable frequency control enables electric power savings at the low speed winding by 5 to 6%. The results obtained are recommended to be widely applied at the change-over of the electric drives with two-speed asynchronous motors to the variable frequency control of performance.

Sign in / Sign up

Export Citation Format

Share Document