Applied sciences

Archives of Electrical Engineering

Content

Archives of Electrical Engineering | 2024 | vol. 73 | No 2

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Abstract

The article presents the influence of the parameters of the high voltage direct current (HVDC) generator with a multiplier, such as: leakage inductance of the high voltage (HV) transformer, capacitance, and the number of multiplier stages on the value of the output voltage, voltage ripple, power and frequency of the supply voltage as a function of the output current. The presented characteristics were obtained under the synchronization conditions of the inverter output voltage and current that powers the multiplier. The presented results will be useful when designing HVDC generators with Cockcroft-Walton multipliers.
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Authors and Affiliations

Jan Mućko
1
ORCID: ORCID

  1. Faculty of Telecommunications, Computer Science and Electrical Engineering Bydgoszcz University of Science and Technology Al. prof. S. Kaliskiego 7, 85-796 Bydgoszcz, Poland
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Abstract

The article presents the Power Hardware in the Loop (PHIL) approach for an autonomous power system analysis based on the synchronous generator model incorporating magnetic saturation effects. The model was prepared in the MATLAB/Simulink environment and then compiled into the C language for the PHIL platform implementation. The 150 kVA bidirectional DC/AC commercial-grade converter was used to emulate the synchronous generator. It was controlled by the real-time simulation control unit with the prepared synchronous generator model incorporating magnetic saturation effects. The proposed approach was validated on the 125 kVA synchronous generator connected to the active and reactive loads of different values for the steady-state and the transient-state performance studies.
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Authors and Affiliations

Filip Kutt
1
ORCID: ORCID
Łukasz Sienkiewicz
1
ORCID: ORCID
Szymon Racewicz
2
ORCID: ORCID
Michał Michna
1
ORCID: ORCID
Roland Ryndzionek
1
ORCID: ORCID

  1. Gdansk University of Technology, Faculty of Electrical and Control Engineering ul. Gabriela Narutowicza 11/12, 80-233 Gdansk, Poland
  2. University of Warmia and Mazury in Olsztyn, Faculty of Technical Science ul. Oczapowskiego 11, 10-710 Olsztyn, Poland
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Abstract

The influence of the capacitor configuration in the pulse supply system for rail accelerators on its efficiency was investigated in the paper. Two different configurations were compared: the first with a parallel connection of capacitors and the second with a parallel-series connection. In both cases, the same number of capacitors was assumed. All other parameters of the device were kept constant, i.e. mass and dimensions of the armature, rail length and stator geometry. A field-circuit model was used to analyse numerically the transients for different capacitor configurations and voltage values. The model was verified experimentally.
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Authors and Affiliations

Paweł Piekielny
1
ORCID: ORCID
Andrzej Waindoko
1
ORCID: ORCID
Paweł Mamala
1
ORCID: ORCID

  1. Department Of Electrical Engineering And Mechatronics, Opole University Of Technology Prószkowska 76 Str., 45-758 Opole, Poland
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Abstract

In recent years, the high frequency oscillation (HFO) accidents caused by long link delay in modular multilevel converter-based high-voltage direct current (MMC-HVDC) transmission projects have posed new challenges to the safety and stability of power system operation. This paper adopts delay stability margin to measure the high frequency stability of the MMC-HVDC system and derives the state space model of the MMC-HVDC time-delay system considering the link delay. The Lyapunov direct method is extended to the stability analysis of the MMC-HVDC time-delay system and the delay stability margin of the system is solved based on the linear matrix inequality (LMI). Then the influence of the controller parameters on the delay stability margin of the MMC-HVDC system is analyzed. Based on improved Smith predictive compensation control, an HFO suppression strategy of the MMC-HVDC system is proposed to improve the high frequency stability of the system by equivalently reducing and eliminating the total link delay. The effectiveness of the Lyapunov direct method for solving the delay stability margin of the MMC-HVDC system and the superiority of the proposed HFO suppression strategy are verified by the time-domain simulation in PSCAD/EMTDC. The research provides a novel viewpoint for the study of the HFO and suppression strategy of the MMC-HVDC system.
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Authors and Affiliations

Fang Zhang
1
ORCID: ORCID
Xiugong Liang
1
Wenpeng Yao
1

  1. School of Electrical and Information Engineering, Tianjin University 92 Weijin RoadNankai District, Tianjin, China
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Abstract

Increasing numbers of devices of various types are now connected to power lines. Their nonlinear nature harms the operation of the lines, as the line voltage is distorted from a sine wave, which causes disturbances in the operation of other loads. This study proposes a method of active parallel compensation that can be realised using a power supply. The proposed device is a dual-function system: it supplies the load connected to its DC link, and operates as a parallel active filter. This kind of device, with a relatively low value of the rated output power, could be implemented in electrical systems to provide distributed compensation. The second novel aspect of this work is the use of a tunable inductive filter, which is included at the input of the power electronics controlled current source and forms a main part of the power supply. The use of this tunable inductive filter increases the frequency response of the current source, while at the same time, in the quasi-steady state of power supply operation, the pulse modulation component of the input current source remains at a minimum level. This paper discusses the structure of an electrical system with the proposed power supply and the rules of operation for the system, and presents test results based on both a simulation and a laboratory model of the system.
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Authors and Affiliations

Łukasz Cieplinski
1
Adam Gulczynski
1

  1. Poznan University of Technology, Faculty of Control, Robotics and Electrical Engineering Piotrowo 3A, 60-965 Poznan, Poland
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Abstract

In order to deal with the threat of the randomness of large-scale electric vehicle (EV) loads to the safe and economic operation of the distribution network effectively, a forecasting method of EV loads based upon virtual prediction parameter estimation strategy is proposed. Firstly, an in-depth analysis is conducted to thoroughly examine the applicability and target audience of various existing power user load forecasting methods. This initial phase provided a solid foundation for the introduction of the new methods. Secondly, utilizing the Monte Carlo simulation method, a charging load forecasting approach that considers both spatial and temporal distribution is developed. This method effectively captures the diversity of EV charging behaviors by leveraging virtual parameter estimation, integrating insights from historical data into future load predictions, thereby enhancing forecasting accuracy. Finally, to validate the effectiveness of this groundbreaking approach, comprehensive testing was conducted on the MATLAB R2017a simulation platform. This verification phase not only serves to demonstrate the method’s accuracy, but also underscores its practicality and reliability in real-world applications.
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Authors and Affiliations

Yongxiang Caio
1
Qing Chen
1
Yang Wang
1
Wie Li
2
Jiakuan Ren
1
Yangquan Qu
1

  1. Electric Power Research Institute, Guizhou Power Grid Co., Ltd Guiyang China
  2. Electric Power Research Institute, South Power Grid Co., Ltd Guangzhou, China
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Abstract

The advancement of ocean renewable energy through Tidal Stream Turbines (TSTs) necessitates the use of a variety of computer models to properly evaluate TST efficiency. The Doubly Fed Induction Generator (DFIG) is the most widely utilized Wind Turbine (WT) in the expanding global wind sector. Grid-tied wind energy systems often use the DFIG to meet conventional grid needs including power quality enhancement, grid stability, grid synchronization, power regulation, and fault ride-through. This paper demonstrates the design of a novel control scheme for the operation of the DFIG. The suggested control scheme consisted of an Improved Recurrent Fuzzy Neural Network (IRFNN) and Ant Colony Optimization with Genetic Algorithms (GACOs). A global control system is created and executed to monitor the changeover between the two operating modes. The plant enters a variable speed mode when the tidal speed is low enough, where the system is controlled to ensure that the turbo-generator module functions at peak power extraction efficiency for any specific tidal velocity. The findings demonstrate the system’s superior efficiency, with the highest power extraction provided despite variations in tidal stream input.
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Authors and Affiliations

Ram Krishan Kumarb
1
Jayanti Choudhary
1

  1. Electrical Engineering Department, National Institute of Technology Patna (800005) Bihar, India
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Abstract

The article presents the results of research on transverse flux machine (TFM) modifications that led to the development of the cogging machine (PMCM) concept and its further evolutions. The transformation process of the cogging machine from a multi-segment to a single-segment modular design has resulted in a structure identical to the known and commonly used fractional slot concentrated winding permanent magnet synchronous machine (FSCW-PMSM). The paper describes the features gained and lost by the modified machine in various transformation stages. An original method for selecting the number of winding modules is also proposed, depending on the number of coils in a module and the pitch of the pole using a separating tooth between the modules.
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Authors and Affiliations

Tomasz Lerch
1
ORCID: ORCID

  1. AGH University of Krakow Faculty of Electrical Engineering, Automatics, Computer Science and Biomedical Engineering
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Abstract

To further enhance the speed regulation range of the hybrid excited machine (HEM), the structure of a magnetic ring is optimized using a combination of the magnetic circuit method (MCM) and numerical analysis method in this paper, and a disc magnetic ring (DMR) is proposed. The magnetic density distribution of the proposed disc magnetic ring hybrid excited machine (DMRHEM) is compared to the radial-axial hybrid excited machine (RAHEM), and the superiority of alleviating a saturation problem in the proposed DMRHEM is determined. To improve the power density, the spoke-type permanent magnet (PM) rotor is applied. The influence of the proposed DMR on the HEM is analyzed, and the field adjustment capability of the proposed DMRHEM is better. Based on this, by combining the bypass principle, the analytical expressions for the relations between the rotor pole-pair number and the motor axial length/stator inner diameter (MAL/SID) as well as flux regulation capability are derived to further explore the superiority of the proposed DMRHEM. The influence mechanism of the rotor pole-pair number and the MAL/SID on the proposed DRMHEM is determined. The optimal MAL/SID and pole-pair number are obtained.
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Authors and Affiliations

Hongbo Qiu
1
Wenhao Gao
1
Shuaishuai Duan
1

  1. Zhengzhou University of Light Industry China
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Abstract

The transportation sector is undergoing a profound transformation, shifting from fossil fuel reliance to electric and hybrid semi-electric alternatives. In response, European countries are implementing novel concepts like electrified highways for trucks and buses, bridging the gap between traditional and electric mobility. This paper centers on the management of electric vehicle (EV) charging infrastructure within industrial zones, crucial nodes for charging networks due to their concentrated economic activity and vehicular movement. The study delves into optimal strategies for deploying charging stations in these zones, considering factors such as station placement, capacity planning, and integration with smart grids to ensure efficient and accessible EV charging. Moreover, the research extends its focus to the integration of vehicle-to-grid (V2G) and grid-to-vehicle (G2V) technologies, illustrating their potential within industrial zones. In our research, we have developed algorithms tailored for the infrastructure of industrial zones, focusing on the integration of storage systems and the charging and discharging dynamics of electric vehicles (EVs). Our case study, supported by numerical simulations, illustrates the outcomes of a 24-hour timeframe, where 126 vehicles were charged, and 134 were discharged. The results provide a comprehensive view of how the grid-maintained balance throughout these operations, ensuring that industrial facilities received the required power to fulfill their operational demands.
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Authors and Affiliations

Lubomir Bena
1
Rikin Tailor
1
Dusan Medved
1
Damian Mazur
2
ORCID: ORCID

  1. Faculty of Electrical Engineering and Informatics, Technical University of Kosice Letna 9, 042 00 Kosice, Slovakia
  2. Faculty of Electrical and Computer Engineering, Rzeszow University of Technology al. Powstancow Warszawy 12, 35-959 Rzeszow, Poland
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Abstract

This study focuses on the maximum torque current ratio control of synchronous reluctance motors and proposes an optimized control method for the maximum torque current ratio of synchronous reluctance motors based on virtual signal injection. Firstly, the research on the maximum torque current ratio control of synchronous reluctance motors based on the virtual signal injection method is conducted, and the existing virtual unipolar square wave signal injection method is analyzed and studied. Secondly, a non-parametric maximum torque current ratio control strategy based on a synchronous reluctance motor combined with the virtual signal injection method is proposed. This strategy does not involve complex parameter calculations, and the control accuracy is not limited by the accuracy of the parameters in the model. The experimental results showed that under the control of virtual bipolar and unipolar square wave signal injection methods, the load torque was converted from 2 Nm to 6 Nm at t = 2:5 s, and there was a significant change in the current amplitude and waveform of the current vector. Under the control of the bipolar injection method, the current amplitude waveform of the motor was lower than that of the unipolar waveform, and the current was smaller. After the load suddenly changed, it could enter a stable state faster. After the load changed at t = 2:5 s, the phase angle of the current vector was quickly adjusted and stabilized under the control of the bipolar signal. The designed method has a good optimization effect compared to the traditional virtual signal injection method, and can achieve high-performance maximum torque current ratio optimization control on synchronous reluctance motors.
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Authors and Affiliations

Jinghua Cui
1

  1. The Department of Electrical Engineering, Hebei Chemical and Pharmaceutical CollegeShijiazhuang, 050026, China
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Abstract

The equivalent circuit of traditional capacitive voltage transformers often faces the problem of complex data calculation and difficulty in grasping the internal nonlinear characteristics of transformers when constructing broadband models, resulting in poor power accuracy and stability. Therefore, with the help of electromagnetic transient physical models, the admittance sub model and nonlinear model are established by considering the frequency and saturation characteristics of the transformer. Based on the characteristics of capacitive voltage transformers, the model is processed in parallel to obtain a broadband coupling transformer model. The results showed that the error between the simulated current peak amplitude and voltage results of the model and the measured values was less than 2% and 1%, respectively. In the fault results, the harmonic error of the load voltage of the improved transformer was relatively small, far less than the error result of 2.73% of the traditional transformer. The proposed transformer model can better characterize its characteristics and has good transient response ability, providing reference tools and value for the operation and state detection of power systems.
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Authors and Affiliations

Jie Geng
1
Haiyong Yang
1
Yi Li
1
Xiao Zhang
1
Yihang Wangb
1

  1. Office of Construction and Campus Planning, Tsinghua University Beijing 100084, China
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Abstract

This study addresses the issue of diagnosing faults in electric vehicle motors and presents a method utilizing Improved Wavelet Packet Decomposition (IWPD) combined with particle swarm optimization (PSO). Initially, the analysis focuses on common demagnetization faults, inter turn short circuit faults, and eccentricity faults of permanent magnet synchronous motors. The proposed approach involves the application of IWPD for extracting signal feature vectors, incorporating the energy spectrum scale, and extracting the feature vectors of the signal using the energy spectrum scale. Subsequently, a binary particle swarm optimization algorithm is employed to formulate strategies for updating particle velocity and position. Further optimization of the binary particle swarm algorithm using chaos theory and the simulated annealing algorithm results in the development of a motor fault diagnosis model based on the enhanced particle swarm optimization algorithm. The results demonstrate that the chaotic simulated annealing algorithm achieves the highest accuracy and recall rates, at 0.96 and 0.92, respectively. The model exhibits the highest fault accuracy rates on both the test and training sets, exceeding 98.2%, with a minimal loss function of 0.0035. Following extraction of fault signal feature vectors, the optimal fitness reaches 97.4%. In summary, the model constructed in this study demonstrates effective application in detecting faults in electric vehicle motors, holding significant implications for the advancement of the electric vehicle industry.
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Authors and Affiliations

Wenfang Zheng
1
Tieying Wang
1

  1. Xinxiang Vocational and Technical College, Xinxiang 453000, China
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Abstract

To effectively suppress the violent galloping of the catenary additional wires in the strong wind section of high-speed railways, the anti-galloping effectiveness and anti-galloping mechanism of the spacer installed on the catenary additional wires are studied. Firstly, the finite element model of the additional wires of the catenary before and after the installation of the spacer is established. Secondly, the random wind field at the additional wires is simulated by the harmonic synthesis method (WAWS). Finally, the galloping response of the additional wires before and after the installation of the spacer is studied by using the finite element software. The results show that the installation of a single spacer at the midpoint of the span can reduce the vertical amplitude of the AF (Additional Feeder) and the PW (Protection Wire) by more than 39.80% and 41.51%, respectively, and the lateral amplitude decreases by more than 16.55% and 38.30%, respectively. The tension of the AF is greatly reduced, while the tension of the PW is slightly increased, so that the galloping of the AF and the PW tends to be synchronized. With the increase in the number of spacers installed, the anti-galloping effect continues to increase. At the same time, the anti-galloping mechanism of the spacer rod to suppress the vibration of the additional wires through the traction effect is clarified, and the effectiveness of the spacer rod in the anti-galloping of the additional wires of the catenary is proved.
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Authors and Affiliations

Youpeng Zhang
1
ORCID: ORCID
Yahui Zhang
1
Shanpeng Zhao
1
Qiang Feng
2
Xiaotong Yao
1
Ni Yang
1

  1. School of Automatic and Electrical Engineering, Lanzhou Jiaotong University China
  2. State Grid Ningxia Electric Power Company China
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Abstract

Studying the impact of renewable energy sources planned to be connected to the grid, requires the preparation of expert opinions. The task of this opinion is to verify that there are possibilities enabling the connection of the considered source to the network. Each opinion is required to take into account other facilities and those sources which were previously connected to the grid or connection agreement were signed with them. The need to take into account such a large number of sources contributes to potential thermal overloads of high-voltage lines. Sometimes these overloads are insignificant, but in certain situations it turns out that their occurrence may be a reason for refusing to sign connection agreements for new sources. According to network operators, their presence may constitute a threat to the operational security of the grid. The article presents the use of the method of tracking active power flows and the DC method of determining power flows to estimate the impact of these sources on thermal overloading of lines. Using of the IEEE-118 test network, selected nodes were analysed where connecting sources might significantly worsen overloads previously observed or would cause new overloads. The proposed approach will enable potential investors to make proper decisions regarding selection of source connection points. Combining the results obtained by both methods at the same time will allow for the indication of appropriate connection nodes for sources from the point of view of minimising the number of overloaded lines and prospective costs of their uprating.
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Authors and Affiliations

Paweł Pijarski
1
ORCID: ORCID
Candra Saigustia
1
ORCID: ORCID
Piotr Kacejko
1
ORCID: ORCID
Lubomir Bena
2
Adrian Belowski
1
ORCID: ORCID

  1. Department of Power Engineering, Lublin University of Technology Nadbystrzycka 38A str., 20-618 Lublin, Poland
  2. Department of Electric Power Engineering, Technical University of Kosice Letna 9 str., 042 00 Kosice, Slovakia
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Abstract

Dual active full-bridge (DAB) DC–DC converters are widely used in DC microgrids and various fields of power electronics. It has the advantages of high-power density, easy to implement soft switching and bi-directional power transfer capability. Conventional linear controllers have difficulty in meeting the increasing demands for speed and robustness. In this paper, a control strategy based on the Brayton–Moser theory of power shaping is proposed to improve the control strategy of DAB DC–DC converters. The DAB DC–DC converter is modelled and the controller is designed based on the Brayton–Moser power-shaping theory. A simulation of the DAB DC–DC converter is constructed and a comparative analysis is carried out for three control strategies of PI control, passive control and power-shaping Brayton–Moser control under different operating conditions.
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Authors and Affiliations

Yajing Zhang
1
Hao Ma
1
Xiuteng Wang
2
Tiancong Shao
2

  1. School of Automation, Beijing Information Science and Technology University No. 12 Qinghe Xiaoying East Road, Haidian District, Beijing, China
  2. Branch of Resource and Environment, China National Institute of Standardization No. 4 Zhi Chun Road, Haidian District, Beijing, China

Instructions for authors

ARCHIVES OF ELECTRICAL ENGINEERING (AEE) (previously Archiwum Elektrotechniki), quarterly journal of the Polish Academy of Sciences is OpenAccess, publishing original scientific articles and short communiques from all branches of Electrical Power Engineering exclusively in English. The main fields of interest are related to the theory & engineering of the components of an electrical power system: switching devices, arresters, reactors, conductors, etc. together with basic questions of their insulation, ampacity, switching capability etc.; electrical machines and transformers; modelling & calculation of circuits; electrical & magnetic fields problems; electromagnetic compatibility; control problems; power electronics; electrical power engineering; nondestructive testing & nondestructive evaluation.

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[1] Author1 A., Author2 A., Title of paper, Title of periodical, vol. x, no. x, pp. xxx-xxx (YEAR).

example

[1] Steentjes S., von Pfingsten G., Hombitzer M., Hameyer K., Iron-loss model with consideration of minor loops applied to FE-simulations of electrical machines, IEEE Transactions on Magnetics. vol. 49, no. 7, pp. 3945-3948 (2013).

[2] Idziak P., Computer Investigation of Diagnostic Signals in Dynamic Torque of Damaged Induction Motor, Electrical Review (in Polish), to be published.

[3] Cardwell W., Finite element analysis of transient electromagnetic-thermal phenomena in a squirrel cage motor, submitted for publication in IEEE Transactions on Magnetics.

Conference manuscript

[4] Author A., Title of conference paper, Unabbreviated Name of Conf., City of Conf., Country of Conf., pp. xxx-xxx (YEAR).

example

[4] Popescu M., Staton D.A., Thermal aspects in power traction motors with permanent magnets, Proceedings of XXIII Symposium Electromagnetic Phenomena in Nonlinear Circuits, Pilsen, Czech Republic, pp. 35-36 (2016).

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[5] Author1 A., Author2 A.B., Title of book, Name of the publisher (YEAR).

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[5] Zienkiewicz O., Taylor R.L., Finite Element method, McGraw-Hill Book Company (2000).

Patent

[6] Author1 A., Author2 A., Title of patent, European Patent, EP xxx xxx (YEAR).

example

[6] Piech Z., Szelag W., Elevator brake with magneto-rheological fluid, European Patent, EP 2 197 774 B1 (2011).

Thesis

[7] Author A., Title of thesis, PhD Thesis, Department, University, City of Univ. (YEAR).

example

[7] Driesen J., Coupled electromagnetic-thermal problems in electrical energy transducers, PhD Thesis, Faculty of Applied Science, K.U. Leuven, Leuven (2000).

For on electronic forms

[8] Author A., Title of article, in Title of Conference, record as it appears on the copyright page], © [applicable copyright holder of the Conference Record] (copyright year), doi: [DOI number].

example

[8] Kubo M., Yamamoto Y., Kondo T., Rajashekara K., Zhu B., Zero-sequence current suppression for open-end winding induction motor drive with resonant controller,in IEEE Applied Power Electronics Conference and Exposition (APEC), © APEC (2016), doi: 10.1109/APEC.2016.7468259

Website

[9] http://www.aee.put.poznan.pl, accessed April 2010.

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