scholarly journals Frequency-current system for relay vector control of non-synchronous electric drive in bridge crane travel mechanism

2015 ◽  
Vol 2015 (4) ◽  
pp. 91-99 ◽  
Author(s):  
Татьяна Сморудова ◽  
Tatyana Smorudova ◽  
Дмитрий Кочевинов ◽  
Dmitriy Kochevinov ◽  
Галина Федяева ◽  
...  
Keyword(s):  
Electric Drive ◽  
Current System ◽  
Frequency Control ◽  
Current Control ◽  
Transverse Displacement ◽  
Bridge Crane ◽  
System Parameters ◽  
High Degree ◽  
Speed And Accuracy ◽  
Frequency Current

This paper reports the variant for the advancement of the functional circuit and algorithms to control a bridge crane travels with the correction of misalignment and transverse displacement on basis of the use of new systems of a nonsynchronous electric drive with frequency control. It is offered to use a simple and reliable frequency – current with an autonomous inverter of current and a relayvector algorithm of control. A functional circuit of the system of frequen-cy-current control for the mechanism of a bridge crane travel with the correction of misalignment and transverse displacement. To analyze a crane position there are used differential values obtained by means of the indication difference in contactless sensors measuring a distance from the preset crane points to rails on the opposite supports. The procedure for the computation of control system parameters is stated. For the check of created functional circuits and algorithms of control there is used a complex electromechanical computer model of a bridge crane with a high degree of detailed elaboration (a virtual prototype of a bridge crane). The modeling results of are shown. The shown frequency – current system of control with the correction of misalignment and transverse displacement allows the decrease of threshold differential valuations and the increase of speed and accuracy of regulation

scholarly journals Investigation of an asynchronous electric drive with frequency control

2021 ◽  
Vol 3 (45) ◽  
pp. 3-3
Author(s):  
Alexander Saakian ◽  
◽  
Keyword(s):  
Energy Efficiency ◽  
Electric Drive ◽  
Frequency Control ◽  
Asynchronous Motor ◽  
Current Control ◽  
Practical Implementation ◽  
Total Conductivity ◽  
Efficiency Criterion ◽  
Asynchronous Electric Drive ◽  
Energy Efficiency Indicator

Currently, there are quite a large number of various scientific papers on the creation of a controlled asynchronous motor and optimization of its modes, and the availability of acceptable results for practical implementation, but there is still no single generally accepted approach to solving the problem. In this regard, the issue of synthesis of scalar control systems that provide the minimum value of a particular energy efficiency criterion is relevant. In this paper, we consider the obtained mathematical model of an asynchronous motor (AD), which differs from the known ones in that the parameters of the substitution circuit are expressed in terms of the stator and rotor conductivities. The energy characteristics of the AD in the sliding function are obtained, which make it possible to determine the dependences of the active and reactive components of the AD current and the possibility of their redistribution within the nominal value of the AD phase current. The principle of optimal frequency-current control of AD is formulated, which differs from the known ones in that, as an energy efficiency indicator, the value of the maximum energy efficiency of AD is used, expressed as the ratio of the active resistance of the rotor circuit to the total conductivity of the AD phase. Keywords: ASYNCHRONOUS MOTOR, ASYNCHRONOUS ELECTRIC DRIVE, EFFICIENCY, POWER FACTOR, ENERGY EFFICIENCY, CIRCUIT CONDUCTIVITY, REPLACEMENT CIRCUIT, SLIP

scholarly journals Simulation and physical modelling of synchronous electric drive for electric and hybrid vehicles

2021 ◽  
Vol 2061 (1) ◽  
pp. 012050
Author(s):  
A N Malyshev ◽  
A N Panarin ◽  
V V Debelov ◽  
M D Mizin
Keyword(s):  
Electric Drive ◽  
Direct Torque Control ◽  
Physical Modelling ◽  
Current Control ◽  
Torque Control ◽  
Drive Control ◽  
Current Inverter ◽  
Element Base ◽  
Theoretical Foundations ◽  
Frequency Current

Abstract The article presents the theoretical foundations of the device and the principle of control of a power electric drive. An overview of the main structural elements and the requirements for the electric drive are made. Power electric drive control systems using inverter converters are considered: frequency-current control based on a current inverter; frequency-current control based on a voltage inverter; direct torque control; vector field control. The main provisions of the use of simulation and physical modeling in the development of an electric drive are presented. On the basis of the previous analysis, the best solutions allowing modeling the electric drive have been selected. The choice of the element base has been substantiated and the development of a physical model has been carried out.

Performance of Pulsating High-Frequency Current Injection Based Sensorless Control of PMSM

2013 ◽  
Vol 347-350 ◽  
pp. 610-616
Author(s):  
Jian Min Wang
Keyword(s):  
High Frequency ◽  
Sensorless Control ◽  
Tracking Error ◽  
Position Estimation ◽  
Current Control ◽  
Current Injection ◽  
High Frequency Current ◽  
Position Errors ◽  
Pulsating Current ◽  
Frequency Current

In the paper the principle and performances of the pulsating current injection based sensorless control of permanent magnet synchronous motor (PMSM) are analyzed theoretically and investigated by simulations. In the analyses, the effects of the speed EMF terms and the deviation between the actual d-axis high-frequency current and the command, which results from the limited gain and bandwidth of the current control loop, are all taken into account. It is shown that the pulsating current injection method can achieve stable position estimation in a wide speed range. But appreciable position errors will result at high speeds due to the cross-coupling effects of the speed EMFs and the tracking error between the actual and command carrier current. In order to improve the performance, a modified scheme is proposed. Its validity is confirmed by simulations.

scholarly journals Developing simulation models for precise adjustment and debugging of ship frequency inverters

2020 ◽  
Vol 2020 (4) ◽  
pp. 95-104
Author(s):  
Sergey Grigoryevich Cherniy ◽  
Aleksandr Sergeevich Sobolev ◽  
Pavel Andreevich Erofeev
Keyword(s):  
Energy Efficiency ◽  
Electric Drive ◽  
Frequency Control ◽  
Frequency Converter ◽  
Operating Mode ◽  
Compressed Air ◽  
Load Factor ◽  
Stable Operation ◽  
Compressor Unit ◽  
Advantages And Disadvantages

The paper describes a variable frequency drive which consists of two elements: an electric drive (synchronous or asynchronous electric drives, that is, drives powered by alternating current are used in capacity of it), and a frequency converter able to control the amplitude and frequency of the voltage supplied to the drive. It becomes possible to control the speed of rotation of the electric motor and the torque on its shaft. The most optimal energy efficiency when using compressor units is achieved under the operating mode when its average daily load factor makes at least 85%. Under the mentioned operating mode fluctuations during the compressed air consumption will be minimal, and the most stable operation of the compressor at its rated nominal power is ensured. In practice, no more than 15% of all the industrial compressors are operated in such operating mode. For 85% of the compressor units the question of improving energy efficiency by regulating its capacity remains open. The method of capacity regulation by using a frequency converter is currently the most optimal and perfect, because adjusting the parameters of the electric drive in this way, the most accurate regulation of the compressed air pressure is provided, which allows reducing the energy consumption in the compressed air injection process, as well as extending the service life of the equipment used. There has been considered a device with frequency control of a compressor unit, debugging of which was carried out on the basis of a mathematical model, which allows choosing the most optimal parameters for frequency control of an electric drive of a compressor unit in order to increase energy efficiency. The analysis of all the advantages and disadvantages of frequency regulation is being carried out, as well as a comparative analysis for selecting the optimal frequency converter in terms of the import substitution

scholarly journals Control system for a frequency synchronized asynchronous electric drive

2021 ◽  
Vol 23 (3) ◽  
pp. 131-141
Author(s):  
V. N. Meshcheryakov ◽  
D. S. Sibirtsev ◽  
S. Valtchev ◽  
E. I. Gracheva
Keyword(s):  
Energy Efficiency ◽  
Control System ◽  
Electric Drive ◽  
Frequency Control ◽  
Frequency Converter ◽  
Mutual Orientation ◽  
Asynchronous Electric Drive ◽  
In Series ◽  
Output Characteristics ◽  
Rotor Winding

THE PURPOSE. In controlled AC drives used on continuous-action mechanisms, which include conveyors, conveyors, cranes, the most widespread are asynchronous motors with a phase rotor, controlled mainly along the rotor circuit using various regulators with low energy efficiency. To improve the energy efficiency of an electric drive based on ADFR, it is proposed to develop a control system that combines the principles of frequency control of the motor along the stator circuit and powering the rotor circuit with constant voltage, which allows the electric drive to be considered synchronized. METHODS. The presence of a DC link in the frequency converter makes it possible in principle to connect the rotor winding in series to this link. However, in order to ensure the frequency principle of regulating the output characteristics of the electric drive, it will be necessary to regulate the rectified current at the input of the inverter and, accordingly, in the rotor windings, which will require a significant change in the standard control system of the frequency converter. The use of an additional adjustable switch in the DC link is proposed. RESULTS. The study of the proposed non-standard control system for a frequency asynchronous synchronized electric drive was carried out by the method of simulation modeling in the Matlab Simulink software package. CONCLUSION. A control system for a frequency asynchronous synchronized electric drive has been developed and investigated on a computer model. A correction system is proposed that allows maintaining a constant value of the load angle in the starting mode. The scalar system of relay frequency control of the electric drive is supplemented with vector correction of the variables, which makes it possible to continuously provide the necessary mutual orientation of the stator current vectors and the rotor flux linkage.

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