Showing papers on "Variable-frequency drive published in 2022"
TL;DR: In this article, a mixed integer non-linear model is developed for the optimal synthesis of cooling water pumping systems according to design and operating requirements, where the decision variables are pump and motor models to use, the number of pumps in the system, the pump operating point, and the VFD-operated motors.
5 citations
TL;DR: In this paper , a mixed integer non-linear model is developed for the optimal synthesis of cooling water pumping systems according to design and operating requirements, where the decision variables are pump and motor models to use, the number of pumps in the system, the pump operating point, and the VFD-operated motors.
5 citations
11 Feb 2022
TL;DR: In this article , the introduction of a frequency-controlled electric drive to HVAC system, in particular, modelling, simulation without feedback and with feedback for controlling the speed of the AHU blower motor in MATLAB were analyzed, the effect on the system harmonics is measured, Energy conservation are presented.
Abstract: Heating, Ventilation and Air Conditioning (HVAC) system is consuming the substantial power for its regular and sustained operation to maintain Relative Humidity (RH) and temperature of the plant in order to keep the quality of the end product. The topic of energy conservation and utilization of conventional energy sources are currently more relevant and important to the present scenario of electrical systems. The most commonly used electric drive in the Air Handling Unit (AHU) of HVAC system is of squirrel cage induction motor. Conventional method of AHU operation was comfortable, but not energy efficient and they are not controlled. Replacing an uncontrolled induction motor with a controlled one in AHU can significantly save electricity, increase the life of the mechanical part of the drive and improve the quality. The paper provides the introduction of a frequency-controlled electric drive to HVAC system, in particular, modelling, simulation ‘without feedback’ and ‘with feedback’ for controlling the speed of the AHU blower motor in MATLAB were analysed, the effect on the system harmonics is measured, Energy conservation are presented.
2 citations
25 Mar 2022
TL;DR: In this paper , a sugar mill is utilising PLC and SCADA to regulate the actual speed of the proposed motor using a VFD, which is carried out by the Variable Frequency Drive (VFD), which is governed by the Programmable Logic Controller (PLC) and the system is controlled and supervised by SCADA unit.
Abstract: Induction motors are often used in industrial operations, and when combined with PLCs and VFDs, they can run automatically, making them an important aspect of industry automation. A sugar mill is utilising PLC and SCADA to regulate the actual speed of the proposed motor using a VFD. The amount of sugarcane put into the sugarcane crushing machine determines its speed. The Variable frequency drive is used to control the actual speed of the proposed three phase motor based on the load given to the proposed drive machine by increasing or decreasing the RPM of the motor. This activity is carried out by the Variable Frequency Drive (VFD), which is governed by the Programmable Logic Controller (PLC) and the system is controlled and supervised by SCADA unit.
1 citations
TL;DR: The supervisory control and data acquisition (SCADA) system is considered a pioneer system in the field of remote education and an overload protection system has been introduced, which would shut down the Lab and show an error message.
Abstract: The supervisory control and data acquisition (SCADA) system is considered a pioneer system in the field of remote education. Three laboratories are designed for the alternating current (AC) Machine Lab, while the programmable logic controller (PLC) is used to connect the system to the Internet by designing an interface to the system through the DIAView program, where each student has his account and a specific time to implement the experiment and write the result in a report window. In this system, teacher and students can assess the system through a specific window. The teacher can access, control and monitor the performance of the students. The teacher can evaluate each student. Student can access and control the laboratories. The methods to turn on the single-phase induction motor include capacitors, auto transformer and variable frequency drive (VFD). VFD is considered an advanced system at present, to which an intelligent system has been added. Moreover, an overload protection system has been introduced, where it would shut down the Lab and show an error message. The system can work as a local area and public area when connected to the university of KUFA system Moodle server.
01 Jan 2022
TL;DR: In this paper , a control strategy for MMC variable-frequency drive based on permanent magnet synchronous motor (PMSM) is proposed to suppress the capacitor voltage ripples effectively and shows excellent speedregulation and variable load performances.
Abstract: The submodule (SM) capacitor voltage fluctuation threatens the security of the entire modular multilevel converter (MMC) variable-frequency drive system. This paper focuses on the control strategy for MMC variable-frequency drive based on permanent magnet synchronous motor (PMSM). The MMC control strategy is divided into the high-speed and low-speed stages. The traditional capacitor voltage balance method is employed at high speed, and the high-frequency injection method is used at low speed. Combined with motor control, the MMC variable-frequency drive control scheme is constructed. To verify the feasibility and effectiveness of the proposed control strategy, simulation and experiment are carried on. The results show that the proposed control strategy suppresses the SM capacitor voltage ripples effectively and shows excellent speedregulation and variable-load performances.
09 Oct 2022
TL;DR: In this article , an automated off-line test method for VFD-embedded partial discharge (PD) testing is proposed, where the main idea is to perform PD testing at motor standstill at a voltage higher than the operating voltage to identify PD activity in the insulation early, before it occurs during operation.
Abstract: Electrical stresses in industrial variable frequency drive (VFD) motors are increasing with the increasing voltage and dv/dt levels, and with the advent of wide bandgap power devices. This increases the likelihood of partial discharge (PD) in VFD motors, and is expected to increase the risk of stator insulation failures in low voltage (LV) motors for which the insulation is not resistant to PD. To ensure that PD does not occur during operation, LV VFD motors are qualified for PD-free operation in the design or manufacturing stages. However, the PD inception voltage of qualified LV motors decreases with insulation aging exposing them to the risk of PD-induced failure. In this work, an automated off-line test method for VFD-embedded PD testing is proposed. The main idea is to perform PD testing at motor standstill at a voltage higher than the operating voltage to identify PD activity in the insulation early, before it occurs during operation. A series of impulse voltage tests are proposed for stressing the different components of insulation for identifying PD in terminal-end ground, phase, and turn insulation. Testing on a LV, VFD motor verifies that PD can be identified whenever the motor is stopped to provide early warning of insulation failure.
09 Nov 2022
TL;DR: In this article , the system of automated electric drive of the main slurry pump station at a diamond treatment plant via computer modeling in the MatLab software package is presented. But the authors used the established methods of constructing a computer model that is capable of producing steady-state operation parameters for the pump unit when the fluid level in the sump is stabilized.
Abstract: This article reviews the system of automated electric drive of the main slurry pump station at a diamond treatment plant via computer modeling in the MatLab software package. The authors used the established methods of constructing a computer model that is capable of producing steady-state operation parameters for the pump unit when the fluid level in the sump is stabilized. They improved this model by introducing a module to account for the system's behavior when the electric drive speed is below the pump speed limit. This allowed obtaining additional transient process diagrams for the controlled physical parameters of the pump. The authors calculated and demonstrated the energy efficiency of using the variable-frequency electric drive in the slurry pump station at a diamond treatment plant.
TL;DR: The fuzzy PID algorithm is selected to control the motor by frequency conversion and speed regulation, and the motor model is optimized, so that the motor angular frequency parameter can achieve the best effect.
Abstract: Electrical automation technology is a technology that uses computer technology, information technology, and control principles to control and optimize the production process, so as to improve production efficiency. However, there are still some deficiencies in the research on the energy-saving effect of electrical automation technology. Based on the PLC frequency conversion technology, we have carried out experimental research on the pumping unit frequency conversion electrical automation energy-saving system. This paper first analyzes the necessity of constructing a new electrical automation experimental platform and then briefly describes the variable frequency control technology based on PLC controller and the working principle of variable frequency speed regulation. It illustrates the feasibility of variable frequency speed regulation to save energy and conducts mathematical modeling analysis on the electrical automatic pumping unit. In this paper, the fuzzy PID algorithm is selected to control the motor by frequency conversion and speed regulation, and the motor model is optimized, so that the motor angular frequency parameter can achieve the best effect. At the end of this paper, the experimental analysis of the frequency conversion electrical automation energy-saving system of the pumping unit is carried out. The experimental results of this paper show that the established model meets the requirements, and the measurement results show that the frequency of the motor load changes. Coupled with fuzzy PID adjustment, it gradually stabilizes the frequency, and the measurement error is within 3%. It meets the preexperiment requirements. When fuzzy PID control is added in the experiment, the motor speed fluctuation is small, and the error value is small. The results show that the frequency conversion technology based on PLC is an effective technology for the energy saving of the frequency conversion electrical automation of the pumping unit.
09 Nov 2022
TL;DR: In this article , the authors proposed a correction mechanism for the control signal between the stator current and the main flux linkage based on a comparison of the values of stator and rotor currents.
Abstract: The inclusion of corrective elements in the frequency control systems of an induction electric drive makes it possible to achieve the best energy and dynamic performance of an induction electric drive. To build correction systems, it is necessary to use observers of variables of an induction motor that are inaccessible for measurement. The most convenient and versatile variables for building correction systems are the angles between any two torque-generating variables of an induction motor. It is not possible to measure these angles between vector variables in a scalar control system, but they can be determined indirectly using the instantaneous values of other engine variables available for measurement. For systems of scalar frequency-current control of an induction electric drive, such calculations are rather complicated and have a large error due to the need to filter the stator voltage pulse signals. When using an induction motor with a phase wound, the solution to the problem of constructing a correction system for a frequency electric drive is simplified due to the possibility of determining the required angle based on measuring the instantaneous values of the stator and rotor current using standard current sensors. Such a correction system is effective and workable. thanks to the ability to determine the required angle based on the measurement of the instantaneous values of the stator and rotor current using standard current sensors. Such a correction system is effective and workable. thanks to the ability to determine the required angle based on the measurement of the instantaneous values of the stator and rotor current using standard current sensors. Such a correction system is effective and workable. The mechanism for correcting the control signal between the stator current and the main flux linkage is considered on the basis of a calculation based on a comparison of the values of the stator and rotor currents.
24 Aug 2022
TL;DR: In this paper , the authors describe hardware design considerations and performance results of a new state-of-the-art fully integrated hybrid controller developed for driving a fractional horsepower compressor motor on magnetic bearings for space applications.
Abstract: This paper describes hardware design considerations and performance results of a new state of the art fully integrated hybrid (dual) controller developed for driving a fractional horsepower compressor motor on magnetic bearings for space applications. To improve performance and reliability of compressor motor, magnetic levitation (magnetic bearings) has been used in lieu of more conventional bearings (e.g., ball bearings or air bearings). This improves resistance to contaminants and enable extensibility with regards to blower speed, pressure rise and mass flow rate. The hybrid integrated controller consists of a high-performance Variable Frequency Drive (VFD) and Magnetic Bearing Controller (MBC).
TL;DR: In this article , the authors present a survey of the state-of-the-art technologies used in the field of information technology and software engineering in the context of cyber-physical networks.
Abstract: На основе использования выражений для ускорения и скорости при пуске и торможении оптимальной s-тахограммы изменения скорости лифта (синусоидальный закон изменения рывка) предложена методика и приведен пример расчета циклового КПД синхронного двигателя с постоянными магнитами (СДПМ).
TL;DR: In this article , the authors discuss the pumping system study involved detailed discussions with Maintenance Engineers and find that there is a good amount of saving potential available on replacement of the pumps with Energy Efficient pumps.
Abstract: This paper discuss the pumping system study involved detailed discussions with Maintenance Engineers. The flow, pressure and power measurements for the pumps were done with the advanced instruments available with GIN. A total of around 2 Pumps were studied during the audit period. We find that there is a good amount of saving potential available on replacement of the pumps with Energy Efficient pumps call it a variable speed drive, adjustable frequency drive, adjustable speed drive, AC drive, inverter drive or something else, a variable frequency drive (VFD) can reduce the energy usage of an electric motor up to 90%, extend motor life, deliver a payback in as little as 6 months and often qualify for energy-saving financial incentives. Since HVAC consumes the most energy in a building and motors account for the majority of HVAC energy usage, using VFDs on pump and fan motors can result in substantial energy cost reductions.
TL;DR: The primary control system was made an automatic Rebung chopper based on the VFD with Arduino Uno, which shows that at a frequency of 20 Hz with a speed of 147.8 rpm, it produces chops with a length of 3 cm in 2 minutes 54 seconds.
Abstract: In chopping Rebung for the home industry, they still use conventional methods and lack the application of technology. This, of course, causes the productivity and quality of the home industry products to be less than optimal. Productivity is influenced by several factors, including requiring workers to be more careful so that it requires a lot of concentration, worker fatigue, which makes it less optimal in using time, and the workers' speed. Therefore, the primary control system was made an automatic Rebung chopper based on the VFD with Arduino Uno. The 3-phase induction electric motor is used as a prime mover for chopping blades and control using VFD (Variable Frequency Drive). For the critical system, use a spring and open the pressing tube's lid using a servo motor and the buzzer as a monitoring medium. The test uses VFD to adjust the rotational speed of the electric motor. The test results show that at a frequency of 20 Hz with a speed of 147.8 rpm, it produces chops with a length of 3 cm in 2 minutes 54 seconds. At a frequency of 35 Hz with a speed of 221.2 Rpm, it produces 2 cm chunks in 1 minute 53 seconds. At a frequency of 50 Hz with a speed of 260.1 Rpm, it produces 1 cm chops in 1 minute 5 seconds. If chopping is done manually, it takes 5 minutes with an average length of 2 cm
TL;DR: In this article , an analysis has been performed to investigate the potential impact of using alternating current (AC) line reactor and direct current (DC) link choke combination on harmonic mitigation in a VFD driven water-cooled centrifugal chiller compressor.
Abstract: With the goals of a better power factor and reduction in energy use, variable frequency drives (VFDs) have been standardized in various industrial applications including Heating, Ventilation, and Air-conditioning (HVAC) systems. However, key issues related to the deterioration in the power quality associated parameters (voltage harmonic distortion and current harmonic distortion) due to the growing number of VFDs demand a wholesome analysis of the problems faced by the users. In this present work, an analysis has been performed to investigate the potential impact of using alternating current (AC) line reactor and direct current (DC) link choke combination on harmonic mitigation in a VFD driven water-cooled centrifugal chiller compressor. Using a combination of AC line reactor and DC link choke as one of the low cost solutions in harmonic mitigation of a VFD driven load in HVAC systems can be decided based on the investigation done in this research work.
TL;DR: The obtained simulation results show that the combination of the FLC speed Controller and SVPWM provides a faster and more effective method of controlling the speed of electrical submersible pumps than the conventional PID speed controllers.
Abstract: Electrical submersible pumps (ESPs) are multistage centrifugal pumps driven by specially designed three-phase induction motors. They are used in many applications such as nuclear and petroleum industries. In the presented paper, we study the speed control of an ESP pump using a rule-based fuzzy logic controller (FLC). As a case study, an oil well is considered to analyze the effects of changing the speed of an ESP pump on both the ESP pump and motor parameters. The proposed speed control model of ESP pumps provides the ability to optimize wells production and power consumption, as well as soft starting of ESP motors. This is done by using a variable speed drive (VSD), which changes the frequency of the voltage supplied to the ESP motor. The utilized VSD model consists of a two-level voltage source inverter (VSI), space vector pulse width modulator (SVPWM) and a rule-based fuzzy logic speed controller. Also, in this study a dynamic hydraulic model of an oil well is implemented. In this study, a mathematical model of the ESP motor and ESP pump is developed. The obtained simulation results show that the combination of the FLC speed Controller and SVPWM provides a faster and more effective method of controlling the speed of electrical submersible pumps than the conventional PID speed controllers. The MATLAB/ SIMULINK software is used to achieve simulative validation of the complete system.
20 Oct 2022
04 Aug 2022
TL;DR: In this paper , a low-cost variable frequency drive (VFD) is designed and tested to drive an induction motor by varying the frequency and voltage supplied to it using a Sinusoidal Pulse Width Modulation (SPWM) control technique.
Abstract: A low-cost Variable Frequency Drive (VFD) is designed and is tested to drive an Induction Motor (IM) by varying the frequency and voltage supplied to it. A Sinusoidal Pulse Width Modulation (SPWM) control technique has been implemented to drive the motor. It has been developed with the support of LabVIEW software tools using the NI MyRIO-1900 controller. The performance of the designed VFD is verified and the results are presented here by conducting a few experiments.
TL;DR: In this article , a comprehensive review on applications of variable speed drive (VSD) in electrical motors energy savings and energy use has been presented; the purpose is to identify incorporated costs of applying variable speed drives and energy saving opportunities to the existing applications of electrical motors.
Abstract: Variable speed drive (VSD) can provide reliable dynamic systems and essential savings in energy usage and costs of the electrical motors. A variable speed drive (VSD) is a device that regulates the rotational force and speed of mechanical equipment. VSDs are effective in energy savers in fan and pump applications; they strengthen process operations, especially where flow control is involved. VSDs provide accurate soft-start capabilities, which decrease line voltage sags and electrical stresses associated with complete voltage motor start-ups, particularly when driving high-inertia loads. Variable speed drive technology and the significance of controlling the speed of existing electrical motors have attracted many attentions in the recent years with the advent of new magnetic materials and power devices. Thus, this paper highlights a comprehensive review on applications of VSD in electrical motors energy savings and energy use. The purpose is to identify incorporated costs of applying variable speed drives and energy saving opportunities to the existing applications of electrical motors. Author hopes to provide convenient information for future variable speed drive applications like pumps, chillers, fans, heaters and ventilators.