 Subjects -> ELECTRONICS (Total: 207 journals)
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- Analysis of mutual inductance between transmitter and receiver coils in
Wireless Power Transfer System of Electric Vehicle
Authors: Junlong Zheng
Abstract: In the electric vehicle wireless power transfer (WPT) system, the mutual inductance coefficient (M) between the transmitting and receiving coils is an important factor influencing overall system efficiency. We reviewed a large number of research papers in this field but did not find a detailed analysis of the M. There are two contributions in this paper. First, the detailed mathematical model of the M was developed. Second, the three-dimensional spatial distribution diagram of the M was drawn using Python software, and the maximum value and its corresponding position coordinates were calculated. Then, the theoretical analysis of the M distribution in this paper was proven correct through experiments. The theoretical analysis and experimental verification of the M distribution in this paper provided a theoretical reference for the positioning requirements in the electric vehicle WPT system between the transmitting and receiving coils.
PubDate: 2023-09-28
Issue No: Vol. 21 (2023)
- CONTROL APPROACH OF A GRID CONNECTED DFIG BASED WIND TURBINE USING MPPT
AND PI CONTROLLER
Authors: Samatar ABDI YONIS, Ziyodulla YUSUPOV, Adib HABBAL, Olimjon TOIROV
Abstract: Doubly fed induction generator (DFIG) has been frequently utilized in wind turbines due to its ability to handle variable speed operations. This study investigates the real parameters of a Mitsubishi company MWT 92/2.4 MW wind turbine model. It performs and implements grid-connected variable speed turbines, to control the active and reactive powers. Moreover, it presents a vector control strategy of DFIG for controlling the generated stator power. Meanwhile, the rotor side converter (RSC) and grid side converter (GSC) are developed separately. Proportional-Integral (PI) controller and maximum power point tracking (MPPT) algorithm are implemented to regulate the generated torque, active or reactive powers, grid voltage, stator and rotor currents. In addition, MPPT and PI controllers are compared in terms of settling time. Thus, the result demonstrates that the performance of the MPPT technique provides strong robustness and reaches steady-state much faster than the PI controller with variable parameters. To the contrary, typical PI controller gives fast response in tracking the references of DFIG magnitudes. The effectiveness of the overall system is tested by MATLAB simulation.
PubDate: 2023-09-28
Issue No: Vol. 21 (2023)
- COOT BIRD BEHAVIOR-BASED OPTIMIZATION ALGORITHM FOR OPTIMAL PLACEMENT OF
THYRISTOR CONTROLLED SERIES COMPENSATOR DEVICES IN TRANSMISSION POWER
NETWORKS
Authors: Thang Trung Nguyen
Abstract: This study presents the application of Coot bird behavior-based optimization algorithm (COOTBA) for optimal placement of Thyristor Controlled Series Compensator (TCSC) devices in an IEEE 30-node transmission power network with three single objectives, including fuel cost, power loss, and voltage deviation. COOTBA proves that TCSC is very useful for the power system to reduce cost and loss and improve the voltage of loads. COOTBA is implemented for the system with one case without TCSC devices and three others with TCSC. The results from the second case, only optimization of TCSC’s reactance, have better cost and voltage but worse voltage stability than the first case without TCSC devices. For the third case, with optimization of both location and reactance of TCSC devices, the cost, loss, and voltage are better than in the first case but worse than in the fourth case. The third case limits the maximum reactance of TCSC within 0 and 0.02 pu, while the fourth case expands the range. The comparisons of results from COOTBA indicate that TCSC should be optimized for both location and reactance, and the limitation of TCSC devices should be high enough. In addition, COOTBA is also compared and superior to about fifteen other previous algorithms, including original, improved, and hybrid metaheuristic algorithms. Thus, COOTBA is an effective algorithm for optimizing TCSC devices on transmission power systems.
PubDate: 2023-09-28
Issue No: Vol. 21 (2023)
- Effects of Undesirable Features of A Double Stator Switched-Flux Permanent
Magnet Machine
Authors: Chukwuemeka Chijioke Awah, Stephen Ejiofor Oti, Ifeanyi Nnabuenyi
Abstract: A comparative study of undesirable effects of double stator switched-flux permanent magnet machine would be investigated, considering its rotor pole numbers. The predicted finite element analysis (FEA) machine parameters are: unbalanced magnetic force (UMF), total harmonic distortion (THD), torque ripple, cogging torque and static torque. It is revealed that the machine types that have odd number of rotor poles have lower undesirable machine properties such as: low cogging torque, low torque ripple and low total harmonic distortion compared to the ones that have even number of rotor poles; though, with higher amount of unbalanced magnetic force on the rotor. More so, the machine types having odd number of rotor poles would have higher air gap flux density magnitudes; and would also exhibit better average torque per magnet usage, which is desirable for reduced cost implications.
PubDate: 2023-09-28
Issue No: Vol. 21 (2023)
- INFLUENCE OF CUTS IN THE HOUSING AND ARMATURE OF THE FORCED ELECTROMAGNET
OF THE FUEL INJECTION SYSTEM ON ITS SPEED
Authors: Yevhen I. Baida, Michael G. Pantelyat, Serhii V. Vyrovets
Abstract: Electromagnetic mechanisms are widely used in various systems due to the simplicity of their design and reliability in operation. One such system is the fuel injection system for an internal combustion engine. The electromagnets installed in such systems should have a number of special properties: they should have small dimensions, high speed, which is ensured by forcing, a small mass of moving elements, an increased residual air gap, a small armature stroke and minimal eddy currents in the magnetic core. The reduction of eddy currents is carried out through the use of steels with increased resistivity and special cuts in the housing and armature, which significantly complicates the design of the electromagnet, but is an effective method for reducing losses for DC electromagnetic systems. To assess the influence of the design of an electromagnet on its speed, the article present a comparative analysis of the solution of the problem of dynamics in a 3D formulation for a forced armored DC electromagnet and an improved electromagnet with reduced eddy current losses due to special structural cuts in the housing and armature.
PubDate: 2023-09-28
Issue No: Vol. 21 (2023)
- SC-FDMA UPLINK SYSTEM IN HEAVILY FADED AREAS WITH LOW SIGNAL-TO-NOISE
RATIO
Authors: Subhra Surochita MISHRA, Jibendu Sekhar Roy
Abstract: These Single carrier frequency division multiple access (SC-FDMA) has very low power consumption at the sender’s side, and this is one of the potential candidates for uplink in long-term evolution (LTE). The objective of this work is to explore the error probability of SC-FDMA system under sub-carrier mapping in heavily faded areas where the signal-to-noise ratios (SNRs) are very low. Wireless environment with heavily faded areas includes military radio systems; direct sequence spread spectrum system (DS-SS), global positioning system (GPS) etc. The localized FDMA (LFDMA) and distributed FDMA (DFDMA) are used to compare the performances of SC-FDMA in heavily faded areas. In heavily faded area with negative signal-to-noise ratio (SNR), the SC-FDMA system is implemented using modulation and encoding methods to receive a very weak signal. Here, binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 16-PSK, quadrature amplitude modulation (QAM) and 16-QAM modulation techniques are used to calculate the bit error rate (BER) performances. The results show the BER performances of SC-FDMA using mapping schemes for different channels, like, AWGN channel, Rayleigh channel, COST207TU, and COST207RA channel models for heavily faded areas. In AWGN channel, BER at -15dB is about 10 times more than BER at 15dB. The COST207 model shows that the BER is less in typical urban (TU) area compared to the rural area (RA).The performance of BPSK modulation in SC-FDMA system is better in heavily faded areas than other modulation schemes.
PubDate: 2023-09-28
Issue No: Vol. 21 (2023)
- Understanding Frequency Response of Induction Motor Winding through
Electromagnetic Wave Equations
Authors: Hormaz Amrolia
Abstract: Frequency response analysis offers an insight about the integrity of machine windings, when employed as a tool for condition monitoring. To ensure that, an electromagnetic wave is injected from one terminal of winding, and the power of the wave at the receiving terminal is measured. The power at the terminals is measured in terms of either voltage or current. This difference in power at the two terminals can be attributed to the medium's permittivity, permeability and conductivity, through which the signal is being transmitted. This paper offers an explanation for the behavior of the voltage gain frequency response of induction motor winding and propagating medium parameters by employing the fundamental electromagnetic wave equations. Their explanation illustrates how these parameters can affect the response. The correlation established using Maxwell's equation and these parameters with frequency response analysis is evident while identifying open winding fault and issue with machine core inductance. The results are analyzed and interpreted with the new correlation.
PubDate: 2023-09-28
Issue No: Vol. 21 (2023)
- MATHEMATICAL MODELING OF MULTI-UNITS PUMPING STATION WITH ASYNCHRONOUS
ELECTRIC DRIVE OF CENTRIFUGAL PUMPS
Authors: Vladyslav H Lysiak
Abstract: Based on the system approach and the principle of electrohydrodynamic analogy, a formalized mathematical model of a generalized system of asynchronous centrifugal pumping units of a multi-unit pumping station with an asynchronous electric drive of centrifugal pumps was created. The obtained mathematical model was verified by its adaptation to the pump station of the specified configuration. A computer simulation of a number of operational and emergency modes of operation of the pumping station with four hydraulically connected pumps was performed. The scope of use and ways of improving the developed model, as well as the direction of further research, is proposed.
PubDate: 2023-09-28
Issue No: Vol. 21 (2023)
- PRESENCE SERVICE IN IMS
Authors: Ivan Baroňák
Abstract: The presence in contrast to instant messaging (IM) is a dynamic user profile that is visible to others and shares information about itself. It can be represented through statuses that are perceived by other users of the service. Status includes personal information, information about the device, location, type of terminal device or preferred way of contacting the user (messages / video / call). This information is always linked to the person concerned. The presence service uses the SIP protocol, which manages presence information and determines how it is used (for example, who can see the presence information and to what extent) and is designed for a wide range of applications. [1] [2]
PubDate: 2023-09-28
Issue No: Vol. 21 (2023)
- DESPECKLING OF SYNTHETIC APERTURE RADAR IMAGES USING SHEARLET TRANSFORM
Authors: Amit Garg, Anshika Goel
Abstract: Synthetic Aperture Radar (SAR) is widely used for producing high quality imaging of Earth surface due to its capability of image acquisition in all-weather conditions. However, one limitation of SAR image is that image textures and fine details are usually contaminated with speckle noise. This noise is multiplicative and having granular pattern. It is caused due to the integration of various backscattered signals obtained during SAR image acquisition. It degrades the quality of SAR image and causes difficulty in visual interpretation. This paper presents a speckle reduction technique of SAR images based on statistical modelling of detail band shearlet coefficients (SC) in homomorphic environment. Modelling of SC obtained from log transformed noiseless SAR image are carried out as Normal Inverse Gaussian (NIG) distribution. However, SC pertaining to speckle noise are modelled as Gaussian distribution. These SC are segmented as heterogeneous, strongly heterogeneous and homogeneous regions depending upon the local statistics of SAR image. Then maximum a posteriori (MAP) estimation is employed over the SC of all regions of detail bands that belong to homogenous and heterogenous category. Objective and subjective quality assessment is performed for synthetic images and real SAR images. Reference image quality metrics, PSNR and SSIM for synthetic images and non-reference image quality metrics, ENL for real SAR images signify the potential of proposed method in comparison to six existing image denoising methods.
PubDate: 2023-09-28
Issue No: Vol. 21 (2023)
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