Influence of the Seven-Phase Winding Phase Timing Sequence on Producing the Resulting Voltage Vector

Vestnik MEI ◽  
2021 ◽  
pp. 83-91
Author(s):  
Vladimir M. Tereshkin ◽  
◽  
Dmitriy A. Grishin ◽  
Sergey P. Balandin ◽  
Vyacheslav V. Tereshkin ◽  
...  
Keyword(s):  
Function Analysis ◽  
Harmonic Component ◽  
Rotation Frequency ◽  
Space Time ◽  
Phase Voltage ◽  
Voltage Vector ◽  
Analysis Methods ◽  
Time Harmonic ◽  
Traction Drives ◽  
Electric Traction

The subject of the study is a seven-phase symmetric winding, namely, its properties due to the possibility to alter the phase timing sequence. The seven-phase ABCDEFG winding can be connected to a symmetrical seven-phase voltage with different phase timing sequences: ABCDEFG, ACEGBDF, or ADGCFBE. In the study, the vector analysis methods, methods of expanding in a Fourier series, and grapho-analytical function analysis methods were used. The results of theoretical studies are confirmed by experimental data obtained on a prototype seven-phase engine sample. It has been found that with the phase timing sequence ACEGBDF of the seven-phase winding ABCDEFG, the operating space-time vector is the vector of the fifth harmonic component, which rotates in the opposite direction in comparison with the space-time vector that is produced with the phase timing sequence ABCDEFG. With this phase timing sequence, it is only the fifth phase voltage time harmonic component that produces the space-time vector. With the time sequence ADGCFBE, it is only the third time harmonic component that produces the resulting space-time voltage vector. By changing, using the converter control algorithm, the phase sequence, it is possible to obtain three values of the field rotation frequency with the same converter frequency value. These properties broaden the seven-phase machine control capabilities, a circumstance that can be used in implementing modern electric traction drives.

Problems of development of traction drives with brushless traction motors for passenger electric locomotives

2020 ◽  
pp. 20-25
Author(s):  
Andrey Sergeevich Kosmodamianskiy ◽  
◽  
Vladimir Ivanovich Vorobyev ◽  
Mikhail Yuryevich Kapustin ◽  
Oleg Vasilyevich Izmerov ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Rotation Frequency ◽  
Axial Direction ◽  
Traction Drive ◽  
Traction Motors ◽  
Adaptability To Manufacture ◽  
Traction Drives ◽  
Conducting Research ◽  
The One ◽  
Electric Traction

The paper considers a problem of creation of new traction drives with brushless electric traction motors (ETM) for passenger locomotives. Analysis of drive designs revealed that the increase of power of induction motors through the increase of rotation frequency leads to the contradiction between requirements for the design reliability, on the one hand, and requirements for technological simplicity, on the other hand. In order to solve the contradiction it is necessary to use ETM designs that have enhanced torque and minimal dimensions in axial direction. It is established that ETM with disk rotor (axial magnetic flux) satisfy such requirements. The authors proposed an aggregate scheme of support-frame traction drives that include ETM with disk rotor, which allows significantly increasing the adaptability to manufacture and repairability of drive at preservation of reliability. As a result, the authors made a conclusion about the reasonability of conducting research and development work on creation of locomotive ETM with axial magnetic flux. The authors have submitted an application for a patent on the proposed design of traction drive.

Five-Phase Converter Control Algorithms for Implementing Space-Vector Modulation

Vestnik MEI ◽  
2021 ◽  
pp. 86-94
Author(s):  
Vladimir M. Tereshkin ◽  
◽  
Dmitriy A. Grishin ◽  
Vyacheslav V. Tereshkin ◽  
Iskander I. Balgazin ◽  
...  
Keyword(s):  
Vector Space ◽  
Harmonic Component ◽  
Rotation Frequency ◽  
Time Sequence ◽  
Control Algorithms ◽  
Third Harmonic ◽  
Harmonic Vector ◽  
Rotation Direction ◽  
Phase Time ◽  
Voltage Vector

Multiphase (five-phase) motors can be considered as an alternative to three-phase motors in implementing electric traction with vector control. The subject of the study is the five-phase winding voltage vector space formed by various control algorithms of a five-phase converter. Thirty logical states of the converter form three types of the vector voltage space of a symmetrical five-phase winding. Each of the vector space types forms the resulting vector of a certain value. The resulting (generalized) voltage vector can take three different values. With the phase time sequence ABCDE of a symmetrical five-phase winding ABCDE with the spatial phase shift equal to 72 electrical degrees, the fundamental harmonic vector is the resulting working voltage vector. With the phase time sequence ACEBD of a symmetrical five-phase winding ABCDE with the spatial phase shift equal to 72 electrical degrees, the resulting voltage vector of the third harmonic is the resulting working vector. The rotation frequency of the resulting third harmonic vector is three times the rotation frequency of the fundamental harmonic vector, and the rotation direction is opposite to the rotation direction of the fundamental harmonic vector. With one of the phase voltage forms and the phase time sequence ACEBD, the modulus of the resulting voltage vector of the third harmonic component is equal to the modulus of the resulting vector of the fundamental harmonic component. There are two converter control algorithms that form the resulting voltage vectors that are equal in modulus, but with different rotation speeds multiple of three. An approach to studying the multiphase phase winding voltage vector space has been elaborated, which can be applied in implementing vector control.

scholarly journals Present and Future of Supercapacitor Technology Applied to Powertrains, Renewable Generation and Grid Connection Applications

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3060
Author(s):  
Gustavo Navarro ◽  
Jorge Torres ◽  
Marcos Blanco ◽  
Jorge Nájera ◽  
Miguel Santos-Herran ◽  
...  
Keyword(s):  
Energy Storage ◽  
Control Strategies ◽  
Industrial Applications ◽  
Frequency Regulation ◽  
Scientific Publications ◽  
Industrial Systems ◽  
Grid Connection ◽  
Huge Impact ◽  
Traction Drives ◽  
Electric Traction

Energy storage systems (ESS) are becoming essential as a solution for troublesome industrial systems. This study focuses on the application of a type of ESS, a high-power technology known in the literature as supercapacitors or electric double layer capacitors (EDLC). This technology has had a huge impact during the last decade on research related to the electric traction drives, renewable sources and powergrids. Related to this aspect, this paper summarizes the most relevant scientific publications in the last five years that study the use of supercapacitor technology (SCs) in electric traction applications (drives for rail vehicles and drives for road vehicles), generation systems for renewable energy (wind, solar and wave energy), and connection systems to the electric grid (voltage and frequency regulation and microgrids). The technology based on EDLC and the practical aspects that must be taken into account in the op-eration of these systems in industrial applications are briefly described. For each of the aforementioned applications, it is described how the problems are solved by using the energy storage technology, drawing the solutions proposed by different authors. Special attention is paid to the control strategies when combining SCs with other technologies, such as batteries. As a summary, some conclusions are collected drawn from the publications analyzed, evaluating the aspects in which it is necessary to conduct further research in order to facilitate the integration of EDLC technology.

Three-Phase and Five-Phase Motor Windings Common Point Potential Ripple with Respect to the Converter Zero Termina

Vestnik MEI ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 51-59
Author(s):  
Vladimir M. Tereshkin ◽  
◽  
Irshat L. Aitov ◽  
Dmitriy A. Grishin ◽  
Vyacheslav V. Tereshkin ◽  
...  
Keyword(s):  
Amplitude Modulation ◽  
Zero Point ◽  
Space Time ◽  
Common Point ◽  
Point Potential ◽  
Voltage Vector ◽  
Three Phase ◽  
Ripple Amplitude ◽  
The Common ◽  
Rotating Field

The aim of the study is to determine the parameters characterizing the ripple of a motor's three- and five-phase windings common point potentials (for the star winding connection diagram) with respect to the converter zero point. One of the reserves for decreasing electromagnetically induced vibration of an electric motor with a rotating field is to increase the number of working winding phases. The study subject is a five-phase motor winding connected to a bridge converter, namely, its ability to reduce electromagnetically induced vibration in comparison with that in using a three-phase winding. The common point potential ripple parameters are studied, and an approach is proposed to estimating the amplitude modulation of the space-time voltage vector of three- and five-phase windings under the influence of the common point potential ripple with respect to the converter zero point. Theoretical studies were carried out using the Fourier series expansion method and vector analysis methods. To confirm the theoretical results, experimental studies of the prototypes of three-phase and five-phase synchronous motors with inductors made on the basis of permanent magnets were carried out. The main results have shown the following. With increasing the number of phases of the rotating field motor working winding connected to a bridge converter, the common point potential ripple amplitude with respect to the converter zero point decreases, and the ripple frequency increases. The product of ripple amplitude by frequency remains unchanged. It is assumed that the common point potential ripple of the motor multiphase winding with respect to the converter zero terminal results in the amplitude modulation of the space-time voltage vector. With increasing the number of winding phases, the modulation amplitude decreases, and the modulation frequency increases. A five-phase motor has a lower level of the working winding common point potential ripple with respect to the converter zero point in comparison with a three-phase motor. Thus, it can be assumed that there will be a lower level of electromagnetically induced vibration in using a simple converter operation algorithm. The obtained results can be used in designing electric traction systems with vector control on the basis of multiphase motors. With increasing the number of phases, the common point potential ripple amplitude in a multiphase winding with respect to the converter zero point decreases, and the ripple frequency increases. Thus, the common point potential ripple amplitude in a five-phase winding is 5/3 times less than that in a three-phase winding, and the ripple frequency increases by 5/3 times, respectively. With increasing the number of working winding phases, the amplitude modulation of the resulting space-time voltage vector decreases. This circumstance has a positive effect on decreasing the electromagnetically induced vibration.

Real-Time Harmonic Component Decomposition for LV Grids Using Heterodyne Method With Adaptive Moving Average Filters

2021 ◽  
Author(s):  
Tawichai Premgamone ◽  
Jan Kortenbruck ◽  
Egon Ortjohann ◽  
Andreas Schmelter ◽  
Daniel Holtschulte ◽  
...  
Keyword(s):  
Real Time ◽  
Moving Average ◽  
Harmonic Component ◽  
Heterodyne Method ◽  
Component Decomposition ◽  
Time Harmonic

Space–time patterns ofCampylobacterspp. colonization in broiler flocks, 2002–2006

2010 ◽  
Vol 138 (9) ◽  
pp. 1336-1345 ◽  
Author(s):  
M. E. JONSSON ◽  
M. NORSTRÖM ◽  
M. SANDBERG ◽  
A. K. ERSBØLL ◽  
M. HOFSHAGEN
Keyword(s):  
Risk Factors ◽  
Relative Risk ◽  
Function Analysis ◽  
Space Time ◽  
Scan Statistics ◽  
Spatial Scan Statistics ◽  
Factors Associated ◽  
Time Patterns ◽  
Broiler Flock ◽  
Spatial Scan

SUMMARYThis study was performed to investigate space–time patterns ofCampylobacterspp. colonization in broiler flocks in Norway. Data on theCampylobacterspp. status at the time of slaughter of 16 054 broiler flocks from 580 farms between 2002 and 2006 was included in the study. Spatial relative risk maps together with maps of space–time clustering were generated, the latter by using spatial scan statistics. These maps identified the same areas almost every year where there was a higher risk for a broiler flock to test positive forCampylobacterspp. during the summer months. A modifiedK-function analysis showed significant clustering at distances between 2·5 and 4 km within different years. The identification of geographical areas with higher risk forCampylobacterspp. colonization in broilers indicates that there are risk factors associated withCampylobacterspp. colonization in broiler flocks varying with region and time, e.g. climate, landscape or geography. These need to be further explored. The results also showed clustering at shorter distances indicating that there are risk factors forCampylobacterspp. acting in a more narrow scale as well.

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