scholarly journals Regulation of the temperature of an individual heat point by changing the speed of the asynchronous motor

2021 ◽  
Vol 23 (4) ◽  
pp. 156-165
Author(s):  
T. V. Sinyukova ◽  
A. V. Sinyukov
Keyword(s):  
Mathematical Model ◽  
Electric Drive ◽  
Optimal Algorithm ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Control Valve ◽  
Electric Pump ◽  
First Case ◽  
Energy Consuming ◽  
Heat Point

THE PURPOSE. To develop and investigate a mathematical model of an operating object – an individual heat point with two methods of controlling the temperature of the coolant. In the first case, the control of the temperature of the coolant is considered, with the help of a control valve installed on a real object. In the second case, a more reliable and less energy-consuming solution is proposed – replacing the control valve with a frequency- controlled electric drive operating according to the proposed optimal algorithm. METHODS. When solving this problem, the method of computer simulation modeling, implemented by means of Matlab Simulink, was used.RESULTS. The article deals with the problems that arise during the operation of an individual heating point. Possible solutions to the problem associated with the failure of the control valve are given. A solution for regulating the temperature of the coolant is proposed, based on the use of a frequency-controlled electric drive of the electric pump. To implement the proposed solution, no redevelopment of the premises is required, only the installation of a frequency converter on the pump already available in the device of an individual heat station is necessary. CONCLUSION. The conducted research has a practical focus, since the proposed solution is implemented at the existing facility. The use of a frequency-controlled electric drive of a centrifugal pump made it possible to increase the reliability of the existing facility. The results obtained during the simulation allow us to draw a conclusion about the feasibility of using the proposed solution.

scholarly journals Computer-based model of asynchronous electric propulsion drive with three stator windings

2021 ◽  
Vol 1 (395) ◽  
pp. 132-140
Author(s):  
I. Kalinin ◽  
Keyword(s):  
Mathematical Model ◽  
Electric Power ◽  
Electric Propulsion ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Electric Power System ◽  
Propulsion System ◽  
Stator Windings ◽  
Phase Coordinates ◽  
Computer Based

Object and purpose of research. This paper discusses electric propulsion system of leader icebreaker. Its purpose was to develop mathematical and computer-based model of electric propulsion drive powered by asynchronous motor with three stator windings for further investigation of steady, transitional, asymmetric and emergency operation scenarios of electric power and propulsion system for the leader icebreaker. Materials and methods. Hardware and methods for computer-based simulation of complex engineering structures. Main results. Development of the mathematical model representing asynchronous motor with three windings in phase coordinates. Computational studies on direct startup of 15 MW propulsion motor, as well as on steady and transitional operational conditions of ship electric power system consisting of 36 MW synchronous genset, two-winding transformers and electric propulsion drive with 15 MW asynchronous motor in phase coordinates with three stator windings and three-level frequency converter. Calculation of voltage non-sinusoidality ratio for MSB buses with operation of 15 MW propulsion motor driven by 36 MW synchronous genset. Conclusion. Mathematical model of asynchronous motor suggested in this paper could be used to calculate steady and transitional operation scenarios of marine power systems with frequency-controlled three-winding asynchronous motor, as well as to calculate electromechanical and electromagnetic processes and refine frequency control algorithms. This is especially relevant because each of the asynchronous electric machines used in the electromechanical assemblies of leader icebreaker propulsion motors has three stator windings, and this icebreaker is the first experience of applying a 15 MW marine electric drive.

scholarly journals Principle of Organization for Laboratory Stand of the Electric Drive with a Real Regulatory System No Time Scaling

2021 ◽  
Vol 100 ◽  
pp. 06002
Author(s):  
Andrii Pirozhenko ◽  
Yevhenii Modlo ◽  
Ruslan Shaida ◽  
Viktor Batarieiev ◽  
Mykola Zhukov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Electric Drive ◽  
Optimal Algorithm ◽  
Regulatory System ◽  
Mode Switching ◽  
Fourth Generation ◽  
Practical Training ◽  
Design Scheme ◽  
Time Scaling ◽  
Three Phase

The existing practical training of specialists in the field of the electric drive is recognized as insufficient, not allowing them to conduct independently a complex of adjustment works or works on elimination of refusals. All known virtual methods of research of electric drives are scaled in time therefore at the trained skills on use of the measuring and registering devices during the work on real installation don't develop, and also skills on work with real knots of control systems for control of the set drive modes. We propose a stand consisting of a real system of regulation and the model of the power drive to work without time scale, thus significantly closer to the actual laboratory setting drive. The structure of the laboratory stand on the basis of the engine of a direct current of independent excitement with the reversible thyristor converter is in details considered. It is proved that an optimal algorithm for the simulation of three-phase bridge converter operating at anchor chain is an algorithm which rooms include a thyristor and of the remaining thyristors allows you to choose the design scheme and carry out the integration of equations describing electric processes in the circuit detect a change in state of the thyristors and the transition to other design scheme. Given the discrete model and considered design scheme of three-phase bridge Converter in a normal mode switching thyristors and emergency mode, if false turn on of the thyristor during commutation. Mathematical model of the device - the solution of differential equations by numerical integration of the Runge-Kutta. Proposed hardware mathematical model based on the family of microcomputer ARM СortexTM fourth generation.

scholarly journals Research of control systems for lifting and transport mechanisms

2021 ◽  
Vol 23 (3) ◽  
pp. 47-61
Author(s):  
T. V. Sinyukova ◽  
V. N. Meshcheryakov ◽  
A. V. Sinyukov
Keyword(s):  
Comparative Analysis ◽  
Electric Drive ◽  
Frequency Control ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Point Of View ◽  
Asynchronous Motors ◽  
Drive Systems ◽  
Improved Characteristics ◽  
Energy Components

THE PURPOSE. To investigate the existing methods of frequency control and their influence on the characteristics of the asynchronous motor, including the energy parameters. Consider new circuit solutions of the control type under study. Create a mathematical model of each of the methods of frequency control. To analyze the results obtained from the point of view of the behavior of mechanical, electromechanical and energy components. METHODS. When solving this problem, the method of computer simulation modeling, implemented by means of Matlab Simulink, was used. RESULTS. In this paper, various aspects of electric drive systems based on asynchronous motors with the use of cascade switching are studied and described, existing connection schemes for such systems are analyzed, and several new options with improved characteristics are proposed. A comparative analysis of various connection schemes is made, the most interesting results of such analysis are presented, and conclusions are drawn about the future prospects of certain circuit solutions.Electric drive systems were modeled in the Simulink MATLAB environment using software tools to demonstrate the operation parameters of the considered circuits. CONCLUSION. Various schemes for switching on the asynchronous motor in the Simulink Matlab environment were investigated. The results of the study revealed the potential usefulness of using a circuit with a transformer in the rotor circuit, as well as the construction of a multi-motor electric drive with a common transformer and a common frequency converter circuit. The efficiency of parallel connection of rotary circuits of a two-motor electric drive was demonstrated. The methods of returning the sliding energy to the network are also compared, and their effectiveness in a comparative analysis with the operation in the closed-loop rotor mode is demonstrated.

scholarly journals INVESTIGATION OF OPERATING MODES OF FREQUENCY-REGULATED ELECTRIC DRIVE OF PUMPJACK

2019 ◽  
Vol 20 (11-12) ◽  
pp. 56-64
Author(s):  
R. F. Yarish ◽  
A. R. Garifullina ◽  
R. I. Garifullin ◽  
A. N. Yakunin
Keyword(s):  
Mathematical Model ◽  
Electric Drive ◽  
Electric Motor ◽  
Frequency Converter ◽  
Operating Mode ◽  
Operating Modes ◽  
Dynamometer Card ◽  
The Mathematical Model

The analysis of the operating modes of the frequency-controlled electric drive of the pumpjack with the use of dynamometer cards, wattmeter diagrams and the mathematical model of the pump-jack, the effect of the shape of the dynamometer card on the operating mode of the electric motor of the pumpjack is determined. The ways of protection of the transistors in the frequency converter from voltage increase are considered at the transition of the electric motor to the regeneration.

scholarly journals Influence of the type of membership functions of fuzzy variables on transient processes in an electric drive

2021 ◽  
Vol 288 ◽  
pp. 01098
Author(s):  
R.A. Azimov ◽  
N.M. Kuznetsov ◽  
I.N. Morozov ◽  
O.V. Fedorov ◽  
O.V. Vladimirov
Keyword(s):  
Control System ◽  
Electric Drive ◽  
Simulation Modeling ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Transient Processes ◽  
Membership Functions ◽  
Software Environment ◽  
Fuzzy Variables ◽  
Triangular Type

The paper deals with the influence of the type of membership functions of fuzzy variables on transient processes in an electric drive. The membership functions of fuzzy variables of S-shaped type and triangular type are proposed for consideration. To identify the dependencies of the influence of these functions, the article offers simulation modeling in the Matlab software environment, the Simulink application. The system of frequency converter - asynchronous motor (FC-AM) was chosen as the considered control system. Transient processes in the considered system with various types of membership functions are shown. The results of the work are summarized in the conclusions.

scholarly journals MODELING OF Q-H CHARACTERISTICS OF THE ELECTRIC DRIVE WITH A VORTEX ELECTRICAL PUMP

2015 ◽  
pp. 133-137
Author(s):  
A. M. Sagdatullin
Keyword(s):  
Mathematical Model ◽  
Optimal Control ◽  
General Expression ◽  
Flow Rate ◽  
Electric Drive ◽  
Control Limit ◽  
Electric Pump ◽  
Vortex Pump ◽  
Working Section ◽  
Range Of Values

In this paper we consider the possibility of modeling the performance characteristics of the electric drive with a vortex electric pump. The structure of the vortex electric pump studied for the experiment is considered, as well as its Q-H characteristic. To determine the optimal control limit of square-law characteristic of H = f (Q) we offer an ade-quate mathematical model of working Q-H characteristics of the electric vortex pump Pk 200. It is concluded that for studying and searching for optimal performances of the vortex pump Pk 200 the model of square-law characteristic H = f (Q) in accordance with the general expression for the working section can be applied within a certain range of values, i.e. the flow rate from Q1 (1,5) to Q2 (3,5) and the pressure from H1 (67) to H2 (30).

scholarly journals Mathematical Simulation of the Synchronized Asynchronous Electric Drive

2020 ◽  
Vol 178 ◽  
pp. 01021 ◽  
Author(s):  
Victor Meshcheryakov ◽  
Dmitry Sibirtsev ◽  
Ekaterina Mikhailova
Keyword(s):  
Electric Drive ◽  
Control Method ◽  
Frequency Control ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Motor Speed ◽  
Ac Drives ◽  
Asynchronous Electric Drive ◽  
Wide Range ◽  
Rotor Winding

At the end of the last century asynchronous motors with a phase rotor were most widely used among adjustable-speed AC drives. They were used for conveyors, transporters, cranes. That was due to the relative simplicity to adjust the motor speed by acting on the rotor chain. The introduction of a frequency control method in such drives is now complicated by the fact that most frequency converters are designed to be used in drives with a cage asynchronous motor. Shorting of a phase winding leads to highly increased losses during acceleration and motor speed control. If the stator winding of a wound-rotor asynchronous motor is connected to a frequency converter and the rotor winding is connected to a DC link of this converter, the motor will have properties of a synchronous one. The electric drive is able to work in a wide range, while motor characteristics are absolutely rigid. The implementation of such control method is presented in this article. The control system operation has been tested with simulation in the Matlab Simulink software pack. The obtained results are defined as follows.

Improving the system of management of stand tests of fuel equipment of diesel engines

10.12737/4036 ◽  
2014 ◽  
Vol 6 (4) ◽  
pp. 10-12
Author(s):  
Аксенов ◽  
I. Aksenov ◽  
Пиляев ◽  
S. Pilyaev ◽  
Афоничев ◽  
...  
Keyword(s):  
Electric Drive ◽  
Diesel Engines ◽  
Test Bench ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
System Control ◽  
Control Test ◽  
Supply Pressure ◽  
Asynchronous Electric Drive ◽  
Reduce Energy Consumption

The system control test bench, fuel equipment of diesel engines. The use of asynchronous motor together with the Converter of frequency allows to create an effective budget system of adjustable electric drive for maintenance of necessary speed asynchronous electric drive depending on pressure. The proposed management system provides the fuel supply pressure-stable, leading to a significant decrease in hydraulic loads of fuel and diesel equipment. The use of frequency Converter reduces the dynamic load on the engine and optimize operating currents, which creates conditions to reduce energy consumption and increase the service life of machinery.

scholarly journals Analysis of the control system of electric motors of the running gear of self-propelled mine cars used in complex mining and technological conditions

2020 ◽  
Vol 216 ◽  
pp. 01135
Author(s):  
Alim Haqberdiev ◽  
Javokhir Toshov
Keyword(s):  
Motor Control ◽  
Control System ◽  
Control Systems ◽  
Electric Drive ◽  
Electric Motor ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Electric Motors ◽  
Power Circuit ◽  
Motor Control Systems

This article discusses the disadvantages of electric motor control systems for the running gear of mine self-propelled cars of the 5vs-15M brand used for transporting ore to conveyor transport at the Tyubegatan potash Deposit and analyzes the use of a control system with a frequency Converter. Based on the results of the analysis of the recommended possible options for the electric drive, it is advisable to conduct further studies of the electric drive based on an asynchronous motor and a power circuit of a frequency converter.

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