scholarly journals Stabilization of the stator and rotor flux linkage of the induction motor in the asynchronous electric drives with frequency regulation

2020 ◽  
Vol 11 (1) ◽  
pp. 213 ◽  
Author(s):  
Vladimir L. Kodkin ◽  
Aleksandr Sergeevich Anikin ◽  
Aleksander Aleksandrovich Baldenkov
Keyword(s):  
Mathematical Modeling ◽  
Experimental Studies ◽  
Load Shedding ◽  
Frequency Regulation ◽  
Transport Mechanisms ◽  
Control Vector ◽  
Flux Linkage ◽  
Electric Drives ◽  
Stator Current ◽  
Rotor Flux

The article is a continuation of the authors' work in research, mainly experimental, asynchronous electric drives with frequency regulation (AED FR) of hoisting-and-transport mechanisms, in which for constructive, operational and other reasons it is difficult to install additional sensors, for example encoders. The results of the analysis of the dynamics of AED FR with two types of sensorless control: vector and scalar are presented in this article. The study was conducted by mathematical modeling in the Simulink application of the MatLab software using standard control system models. The processes of sequential acceleration of the engine to fixed speeds with overload and load shedding on each of them were simulated. At the same time, the speed and effective values of the flux linkages of the rotor and stator and the stator current were monitored, by which the dynamics and efficiency of each type of control were evaluated. As in experimental studies, the dynamic and efficiency of a more stable scalar control was significantly improved by the use of dynamic positive feedback on stator current.

scholarly journals The experimental identification method of the dynamic efficiency for frequency regulation algorithms of AEDs

2021 ◽  
Vol 12 (1) ◽  
pp. 59 ◽  
Author(s):  
Vladimir L. Kodkin ◽  
Aleksandr S. Anikin
Keyword(s):  
Control Method ◽  
Frequency Control ◽  
Reference Signal ◽  
Frequency Regulation ◽  
Current Feedback ◽  
Electric Drives ◽  
Stator Current ◽  
Asynchronous Electric Drive ◽  
Input Side ◽  
Mechanical Moment

The article proposes and substantiates a method for studying the dynamics of an asynchronous electric drives with frequency control from the input side of the signal for setting the speed of rotation of the electric motor. In this method, a constant speed reference signal is added to a harmonic variable frequency signal. The set of amplitude changes and phase shifts of velocity oscillations are the initial data for identifying the dynamics of the studied control method. The logic of this method is determined by the previously obtained nonlinear transfer function of the link that forms the mechanical moment in the asynchronous electric drive with frequency control. Experiments have shown the dynamic benefits of the drive with positive stator current feedback.

Model of Vector Controlled Induction Drive

2009 ◽  
Vol 147-149 ◽  
pp. 149-154
Author(s):  
Roma Rinkeviciene ◽  
Andrius Petrovas
Keyword(s):  
Induction Motor ◽  
Reference Frame ◽  
Real Variable ◽  
Flux Linkage ◽  
Current Channel ◽  
Stator Current ◽  
Synchronous Reference Frame ◽  
Rotor Flux ◽  
Drive Model ◽  
Motor Model

The paper presents the model of vector controlled induction motor. Induction motor model is carried out in reference frame, fixed on stator. Elaborated model of the drive is suitable for investigation dynamics because output signals appear as real currents, flux linkages and other variables. Vector control law model is implemented for variables in synchronous reference frame; therefore controller operates with transformed variables. Structure of designed model reflects the real variable speed drive. Model of vector controlled induction drive comprise model of induction motor, feedback signals and blocks as well as speed and flux reference blocks and controllers for producing motor supply signals. Feedback blocks are used for calculation stator current vector in the rotor flux linkage reference frame. For flux and speed control are designed lag controllers. Between advantages of that model is additional simulation of current channel law.

scholarly journals Calculation of specific rates of the electric energy consumption at frequency regulation of electric drives: A case study of pumping stations

2021 ◽  
Vol 939 (1) ◽  
pp. 012001
Author(s):  
T Kamalov ◽  
A Isakov ◽  
A Shavazov ◽  
A Elmuratova ◽  
B Tukhtamishev
Keyword(s):  
Energy Consumption ◽  
Experimental Studies ◽  
Electric Energy ◽  
Electrical Energy ◽  
Design Parameters ◽  
Frequency Regulation ◽  
Electric Drives ◽  
Electric Energy Consumption ◽  
Pumping Stations ◽  
Pumping Units

Abstract The issues of developing a methodology for calculating the specific rates of electrical energy consumption during frequency regulation of electric drives of pumping stations are considered. When calculating specific consumption rates, experimental studies were carried out at the Chirchik pumping station. When developing the methodology, technological, design parameters, water consumption, as well as the total capacity of pumping units based on frequency-controlled electric drives are taken into account. At the same time, the characteristics of the main parameters that must be taken into account when choosing variable frequency drives for pumping units are determined.

scholarly journals Third harmonic current injection into highly saturated multi-phase machines

2017 ◽  
Vol 66 (1) ◽  
pp. 179-187
Author(s):  
Felix Klute ◽  
Torben Jonsky
Keyword(s):  
Current Injection ◽  
Saturation Level ◽  
Permanent Magnet Synchronous Machines ◽  
Flux Linkage ◽  
Harmonic Current ◽  
Fem Model ◽  
Third Harmonic ◽  
The Third ◽  
Rotor Flux ◽  
Multi Phase

Abstract One advantage of multi-phase machines is the possibility to use the third harmonic of the rotor flux for additional torque generation. This effect can be maximised for Permanent Magnet Synchronous Machines (PMSM) with a high third harmonic content in the magnet flux. This paper discusses the effects of third harmonic current injection (THCI) on a five-phase PMSM with a conventional magnet shape depending on saturation. The effects of THCI in five-phase machines are shown in a 2D FEM model in Ansys Maxwell verified by measurement results. The results of the FEM model are analytically analysed using the Park model. It is shown in simulation and measurement that the torque improvement by THCI increases significantly with the saturation level, as the amplitude of the third harmonic flux linkage increases with the saturation level but the phase shift of the rotor flux linkage has to be considered. This paper gives a detailed analysis of saturation mechanisms of PMSM, which can be used for optimizing the efficiency in operating points of high saturations, without using special magnet shapes.

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