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Artykuły w czasopismach na temat „Variable frequency drive schemes”

Autor: Grafiati

Data publikacji: 6 września 2023

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1

Alwadie, Abdullah. "A Concise Review of Control Techniques for Reliable and Efficient Control of Induction Motor." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 3 (2018): 1124. http://dx.doi.org/10.11591/ijpeds.v9.i3.pp1124-1139.

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<span style="color: black; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: SimSun; mso-themecolor: text1; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;">Induction motors are work-horse of the industry and major element in energy conversion. The replacement of the existing non-adjustable speed drives with the modern variable frequency drives would save considerable amount of electricity. A proper control scheme for variable frequency drives can enhance the efficiency and performance of the drive. This paper attempt to pr

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Okedu, Kenneth E., and Akhtar Kalam. "Comparative Study of Grid Frequency Stability Using Flywheel-Based Variable-Speed Drive and Energy Capacitor System." Energies 16, no. 8 (2023): 3515. http://dx.doi.org/10.3390/en16083515.

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Recently, there has been a rise in the integration of renewable energy sources into power grids. As a result of this, there is a need to carry out new studies in order to understand the dynamics of power grids during disturbances that is mainly caused by the stochastic nature of wind energy. The operation of modern power grids that are tied to wind farms follows a stipulated grid requirement or grid codes, considering the allowable threshold frequency variation during grid dynamics. This paper presents a comparative study of two frequency control schemes considering grid frequency stability us

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Vasilyev, D. A., R. I. Gavrilov, and L. A. Panteleeva. "Energy-efficient variable frequency asynchronous electric drive." Journal of Physics: Conference Series 2061, no. 1 (2021): 012053. http://dx.doi.org/10.1088/1742-6596/2061/1/012053.

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Abstract Currently, there are quite a large number of various scientific papers on the creation of a controlled asynchronous engine and the optimization of its modes, and the availability of acceptable results for practical implementation, but there is still no single generally accepted approach to solving the problem. In this regard, the issue of synthesis of scalar control systems that provide the minimum value of one or another criterion of energy efficiency is relevant. In this paper, we consider the obtained mathematical model of an asynchronous engine (AE), which differs from the known o

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Yerbayev, Yerbol, Ivan Artyukhov, Artem Zemtsov, et al. "Negative Impact Mitigation on the Power Supply System of a Fans Group with Frequency-Variable Drive." Energies 15, no. 23 (2022): 8858. http://dx.doi.org/10.3390/en15238858.

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The technological installations’ characteristics are possible to improve by equipping fans with a frequency-controlled electric drive. However, it can lead to an electromagnetic compatibility problem in the electrical supply system. This problem becomes worse if a large number of fans are included in the technological installation and the electric drives are powered from a substation connected to a limited power source. As an example, in this article we investigate the power supply system of a gas cooling unit with variable-frequency electric drives for fans. The electric drives’ operating mod

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Han, Qiguo, Kai Zhu, Wenming Shi, Kuayu Wu, and Kai Chen. "Research on the supercapacitor support schemes for LVRT of variable-frequency drive in the thermal power plant." IOP Conference Series: Earth and Environmental Science 121 (February 2018): 042021. http://dx.doi.org/10.1088/1755-1315/121/4/042021.

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Rekha, Mudundi, and Malligunta Kiran Kumar. "Variable frequency drive optimization using torque ripple control and self-Tuning PI controller with PSO." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 2 (2019): 802. http://dx.doi.org/10.11591/ijece.v9i2.pp802-814.

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Drive’s output power must be restricted for the prevention of stresses over higher components in the input power system while utilizing a three-phase Variable Frequency Drive (VFD) which has powered from a single-phase AC source. To resolve this problem, we introduced a novel motor q-axis current (M-QAC) with torque ripple control (TRC) of an induction motor and self-tuning PI controller with particle swarm optimization (STP-PSO) for mitigating the stress over induction motor by the torque ripple elimination and controlling. Our proposed approach has an information related to the different par

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Hruntovich, N. V., A. A. Kapanski, D. Baczynski, G. V. Vagapov, and O. V. Fedorov. "Optimization of a variable frequency drive pump working on a water tower." E3S Web of Conferences 124 (2019): 05060. http://dx.doi.org/10.1051/e3sconf/201912405060.

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The development of the existing water supply system in towns and villages involves the use of frequency converters and specialized control algorithms that can maintain the pressure level established in the supply grid within certain limits. The implementation of the standard scheme includes the elimination of the water tower, which, on the one hand, reduces the cost of its maintenance. On the other hand, in emergency situations, the water tower can still supply water to the consumer, which increases the time of uninterrupted water supply during repairs. The article reveals a method of increasi

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Choi, Yoon-Geol, Hyeon-Seok Lee, Bongkoo Kang, Su-Chang Lee, and Sang-Jin Yoon. "Compact Single-Stage Micro-Inverter with Advanced Control Schemes for Photovoltaic Systems." Energies 12, no. 7 (2019): 1234. http://dx.doi.org/10.3390/en12071234.

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This paper proposes a grid-connected single-stage micro-inverter with low cost, small size, and high efficiency to drive a 320 W class photovoltaic panel. This micro-inverter has a new and advanced topology that consists of an interleaved boost converter, a full-bridge converter, and a voltage doubler. Variable switching frequency and advanced burst control schemes were devised and implemented. A 320 W prototype micro-inverter was very compact and slim with 60-mm width, 310-mm length, and 30-mm height. In evaluations, the proposed micro-inverter achieved CEC weighted efficiency of 95.55%, MPPT

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Lipinskis, Tadas, and Vytautas Bleizgys. "EXPERIMENTAL INVESTIGATION OF A SIX-PHASE VARIABLE FREQUENCY DRIVE / ŠEŠIŲ FAZIŲ DAŽNINĖS PAVAROS EKSPERIMENTINIS TYRIMAS." Mokslas – Lietuvos ateitis 8, no. 3 (2016): 339–44. http://dx.doi.org/10.3846/mla.2016.937.

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Experimental results of a variable frequency drive, consisting of a six-phase voltage source inverter and six-phase asynchronous AC motor are presented in this paper. Frequency converter uses a six-phase space vector PWM scheme created by the author. The voltage forming scheme is implemented in Matlab/Simulink, and logical signals for inverter control are transferred from PC via the National instruments PCI-6024E data acquisition card. Voltages, at which the experimental motor operates at maximum efficiency, were determined experimentally. Motor transitions, when it is operating with one, two,

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Soni, Umesh Kumar, and Ramesh Kumar Tripathi. "High Load Fast Startup Sensorless Control of Wheel BLDC Motor with Line-to-Line Back EMF Extraction Using Least Pth-Norm IIR Digital Filter." Journal of Circuits, Systems and Computers 29, no. 09 (2019): 2050145. http://dx.doi.org/10.1142/s0218126620501455.

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In this paper, an effective scheme of on-load startup with reduced current has been proposed for BLDC motor and the steady as well as dynamic performance in all four quadrants was verified. Hysteresis band-limited back EMF noise provides the starting pulses, the frequency of which depends on the threshold factor in speed proportional threshold. Scheme is quite fast, comparatively to the state-of-the art schemes of startup and less complex than time-consuming initial position detection (IPD) algorithm. Second-order least [Formula: see text]th-norm infinite impulse response (IIR) digital low pas

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Sohaib Choudhary, Muhammad, Muhammad Saqlain Saqi, Muhammad Rameez Javed, et al. "Solar powered space vector pulse width modulation based induction motor drive for industry applications." Bulletin of Electrical Engineering and Informatics 11, no. 4 (2022): 1828–36. http://dx.doi.org/10.11591/eei.v11i4.3023.

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The new millennium has witnessed a rapid growth in the development of solar-powered electric systems as well as variable frequency drives (VFDs). Predominantly, pulse width modulation (PWM) based adjustable frequency drives are being employed in the industry for providing superior performance. The space vector pulse width modulation (SVPWM) has gained importance due to its improved harmonic profile. In the current effort, SVPWM based VFD for an induction motor is devised equipped with a push-pull converter for optimal performance. A feedback system is incorporated for motor controls. The SVPWM

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12

Mushtaq, Basit, and Mairaj-Ud-Din Mufti. "Stability Enhancement of Electric Power Systems by Employing Variable Frequency Transformer." IOP Conference Series: Materials Science and Engineering 1228, no. 1 (2022): 012013. http://dx.doi.org/10.1088/1757-899x/1228/1/012013.

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Abstract Economical and technical advantages inherent in the coordinated operation of power systems resulted in large-scale grid interconnection. The major concern regarding the interconnection of the neighbouring power systems with relatively weak tie-lines is the appearance of poorly damped electromechanical oscillations. Inter-area (IA) oscillations reduce system stability and transmission capacity, and without an efficient damping mechanism, these oscillations can cause system failure and even lead to large-scale blackouts. In this work, the impact of variable frequency transformer (VFT) o

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13

Echeikh, Hamdi, Hichem Kesraoui, Ramzi Trabelsi, Atif Iqbal, and Mohamed Faouzi Mimouni. "A novel DTC scheme for a sensorless five-phase IM drive under open-phase fault." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 2 (2019): 829–44. http://dx.doi.org/10.1108/compel-01-2018-0036.

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Purpose This paper aims to deal with direct torque controller when the five-phase induction motor drive in faulty operation. Precisely, open-phase fault condition is contemplated. Also, the DTC is combined with a speed-adaptive variable-structure observer based on sliding mode observer. Design methodology/approach Two novel features are presented. First, the concept of the virtual voltage vector is presented, which eliminates low-frequency harmonic currents and simplifies analysis. Second, speed information is introduced into the selection of the inverter states. Findings Direct torque control

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14

Jaafar, Miriam, David Martínez-Martín, Mariano Cuenca, John Melcher, Arvind Raman, and Julio Gómez-Herrero. "Drive-amplitude-modulation atomic force microscopy: From vacuum to liquids." Beilstein Journal of Nanotechnology 3 (April 18, 2012): 336–44. http://dx.doi.org/10.3762/bjnano.3.38.

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We introduce drive-amplitude-modulation atomic force microscopy as a dynamic mode with outstanding performance in all environments from vacuum to liquids. As with frequency modulation, the new mode follows a feedback scheme with two nested loops: The first keeps the cantilever oscillation amplitude constant by regulating the driving force, and the second uses the driving force as the feedback variable for topography. Additionally, a phase-locked loop can be used as a parallel feedback allowing separation of the conservative and nonconservative interactions. We describe the basis of this mode a

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15

Khvatov, Oleg Stanislavovich, Timur Zakariyaevich Bilyaletdinov, Pavel Vadimovich Kuznetsov, and Dmitriy Konstantinovich Markov. "Assessment of reliability of variable speed diesel asynchronous generator sets." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2023, no. 3 (2023): 88–96. http://dx.doi.org/10.24143/2073-1574-2023-3-88-96.

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Calculation and subsequent analysis of reliability indicators is a mandatory stage of development and commissioning of technical devices. There has been carried out an assessment of reliability in relation to diesel generator sets operating in the mode of adjustable rotational speed at shared loads, which ensures their high energy efficiency. Unconditional compliance with the requirements for the quality of the generated energy (amplitude and frequency of the voltage in the ship's network) is realized in these generating devices by means of semiconductor converter technology. It is obvious tha

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16

He, Yunfeng, You-Sheng Wang, Qinfen Lu, Lei Zhang, and Fang Liang. "Design of single-sided linear induction motor for low-speed Maglev vehicle in 160 km/h and variable slip frequency control." Transportation Systems and Technology 4, no. 2 (2018): 120–28. http://dx.doi.org/10.17816/transsyst201842120-128.

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Background: The mid-low speed Maglev train adopts the single-sided linear induction motors (SLIMs) as drive part, of which design and control method has become research hotspot when the velocity is elevated from 120 km/h to 160 km/h. Aim: For SLIMs applied in 160 km/h low-speed maglev train, the design scheme is introduced and then a novel variable slip frequency control method is proposed. Methods of the studies: This control method adopts low slip frequency at start-up to produce large starting traction force and high slip frequency during high velocity area to obtain great power

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Xiao, Fei, Lei Yuan, and Ming Liang Chen. "Adaptive Sliding-Mode Observer Scheme for Sensorless Control of Low-Speed IPMSM Drive." Applied Mechanics and Materials 380-384 (August 2013): 536–40. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.536.

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This paper proposes an adaptive sliding-mode observer (SMO) for a low-speed interior permanent magnet synchronous motor (IPMSM) drive. In this paper, an adaptive SMO is employed to estimate the rotor speed and extended EMF, a soft phase locked loop (PLL) technology is used to estimate rotor position due to its strong robustness since under voltage phase unbalance or polluted and variable-frequency environment. The global asymptotic stability of the proposed adaptive SMO is verified using Lyapunov stability analysis with considering motor parameter variations. Simulation results are presented t

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18

Nizimov, Victor, and David Chugunov. "MATHEMATICAL MODEL OF VARIABLE PRODUCTIVITY PROCESS PUMP UNIT OF THE WATER SUPPLY SYSTEM." Collection of scholarly papers of Dniprovsk State Technical University (Technical Sciences) 1, no. (42) (2023): 86–92. http://dx.doi.org/10.31319/2519-2884.42.2023.10.

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The paper solves an actual scientific problem, which consists in the development of a mathematical model of the pumping unit in the variable performance mode. Built compatible characteristics-contacts of the pump unit and the network according to the load schedule when adjusting the performance by the valve and the speed of rotation of the impeller. The functional scheme of the electric drive according to the CF-AM system is given. The purpose of the study is to develop a mathematical model of a pump unit in variable performance modes with a frequency-controlled electric drive of alternating c

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Rodríguez-Olivares, Noé, José Cruz-Cruz, Alejandro Gómez-Hernández, et al. "Improvement of Ultrasonic Pulse Generator for Automatic Pipeline Inspection." Sensors 18, no. 9 (2018): 2950. http://dx.doi.org/10.3390/s18092950.

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This paper presents the improvement of an ultrasonic pulse generator for a pipeline inspection gauge (PIG), which uses 64 transducers for inspecting distances up to 100 km with an axial resolution fixed at 3 mm and variable speeds between 0 and 2 m/s. An ultrasonic pulse generator is composed of a high-voltage (HV) MOSFETs, driver logic and an HV power supply. We used a DC-HV DC converter device as the HV power supply because it reduces the size of the ultrasound system considerably. However, pipeline geometry and inspection effects such as hammer and shock cause a variable pulse repetition fr

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Ashraf, Naveed, Ghulam Abbas, Nasim Ullah, et al. "A Transformerless AC-AC Converter with Improved Power Quality Employed to Step-Down Power Frequency at Output." Energies 15, no. 2 (2022): 667. http://dx.doi.org/10.3390/en15020667.

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Variable voltage and frequency are required to govern the torque-speed characteristics of many industrial drive systems. Traditionally, this is achieved with a power converting system implemented with multistage converters. This technology is based on rectifying AC power into DC and then DC into AC with an inverter circuit. The power quality concerns of both conversion stages are tackled by selecting high switching frequency PWM control and harmonics mitigation filters. Also, using a bulky DC-link capacitor is one of the big sources of low system reliability, so this approach increases the con

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Shamseldin, Mohamed A., Abdel Halim M. Bassiuny, and Abdel Ghany M. Abdel Ghany. "Design variable structure fuzzy control based on deep neural network model for servomechanism drive system." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 4 (2022): 2529. http://dx.doi.org/10.11591/ijpeds.v13.i4.pp2529-2540.

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This paper presents a new scheme for variable structure (VS) fuzzy PD controller. The rule base of the fuzzy PD controller is tuned online. The purpose of the proposed controller is to track accurately a preselected position command for the servomechanism system. Therefore, this study establishes a model using a black-box modeling approach; simulations were performed based on real-time data collected by LabVIEW and processed using MATLAB. The input signal for the servomechanism driver is a pseudo-random binary sequence that considers violent excitation in the frequency interval. The candidate

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Sankar, A. Bharathi, and R. Seyezhai. "Investigation of PMSG Fed Diode-Clamped Multilevel Inverter for Wind Energy System." Advanced Materials Research 768 (September 2013): 16–22. http://dx.doi.org/10.4028/www.scientific.net/amr.768.16.

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Wind energy has drawn worldwide attention because of its simple structure, high efficiency and stable operation. Recently, variable speed constant frequency (VSCF) direct-drive wind power generation system using permanent magnet synchronous generator (PMSG) has gained popularity. This paper focuses on the simulation of PMSG fed diode clamped MultiLevel Inverter (MLI) for wind applications. A three-level MLI with phase disposition PWM technique has been proposed. Simulation studies on the proposed scheme have been carried out in MATLAB and spectral quality of the output has been investigated.

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Magzoub, Muawia A., Nordin B. Saad, and Rosdiazli B. Ibrahim. "The Impacts of the Disturbances for the Hybrid Fuzzy-Fuzzy Controller Applied to Induction Motor Drive." Applied Mechanics and Materials 785 (August 2015): 116–21. http://dx.doi.org/10.4028/www.scientific.net/amm.785.116.

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The study of the effects of an internally and externally caused disturbances for the advanced hybrid fuzzy-fuzzy controller (HFFC) scheme in order to gain control over the speed of an induction motor’s (IM) variable speed drive (VSD) is the main objective of this research paper The HFFC works on the principle of gaining control over the rotor speed during steady-state stage using fuzzy stator current magnitude controller whereas, during an accelerate-decelerate stage by utilising a fuzzy frequency controller, to overcome the disadvantage of field oriented control (FOC) method. The design of a

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Zheng, Bin, Shengyan Fu, and Jilin Lei. "Topology Optimization and Multiobjective Optimization for Drive Axle Housing of a Rear Axle Drive Truck." Materials 15, no. 15 (2022): 5268. http://dx.doi.org/10.3390/ma15155268.

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As one of the important load-bearing components of a truck, the drive axle housing must meet the requirements of stiffness and strength. The traditional design method uses redundancy design to meet the performance requirements. The joint design between the three-dimensional mathematical model and finite element model is adopted, and the optimal design of the drive axle housing is realized based on topology optimization and multiobjective optimization. Firstly, the static analysis of the drive axle housing of a rear axle drive truck was carried out with four typical working conditions. It was c

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Shprekher, Dmitry, Gennady Babokin, and Dmitry Ovsyannikov. "The Control System for Leveling Loads in a Drag Conveyor Multi-Motor Drive." Известия высших учебных заведений. Электромеханика 65, no. 3 (2022): 56–65. http://dx.doi.org/10.17213/0136-3360-2022-3-56-65.

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Drag conveyor is the main means of delivering coal from the cutter loader to the vehicles of the belt entry in under-ground mining of coal deposits. In powerful drag conveyors, in conditions of limited equipment in terms of dimensions, a multi-motor electric drive is used, including from two to four electric motors. The load imbalance between the motors in such an electric drive is its main problem. In order to solve this problem, the existing methods of load balancing in a multi-motor electric drive have been analyzed and a strategy for a variable frequency drive with vector control of sev-er

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Shargorodskiy, Serhiy, Vasyliy Yanishevskiy, and Olga Yalina. "OVERVIEW OF TECHNOLOGIES AND TECHNOLOGICAL EQUIPMENT FOR HAYME PROCESSING." ENGINEERING, ENERGY, TRANSPORT AIC, no. 3(110) (October 30, 2020): 145–52. http://dx.doi.org/10.37128/2520-6168-2020-3-15.

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Fodder production is one of the most important sectors of the agro-industrial complex of Ukraine, the pace and scientific and technical level of development of which largely determines the solution of the country's food problem, full satisfaction of the population's food needs. A limiting factor for the development of this industry is the lack of efficient, easy-to-use and cheap equipment for collecting, raking, stirring, and pressing domestically produced hay, which would be able to compete with foreign analogues. The publication is devoted to the development of a hydraulic drive of the worki

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Sahu, M. K., A. K. Panda, and B. P. Panigrahi. "Direct Torque Control for Three-Level Neutral Point Clamped Inverter-Fed Induction Motor Drive." Engineering, Technology & Applied Science Research 2, no. 2 (2012): 201–8. http://dx.doi.org/10.48084/etasr.117.

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Direct torque control (DTC) is a control technique in AC drive systems to obtain high performance torque control. The classical DTC drive contains a pair of hysteresis comparators and suffers from variable switching frequency and high torque ripple. These problems can be solved by using space vector depending on the reference torque and flux. In this paper the space vector modulation technique is applied to the three-level Neutral Point Clamped (NPC) inverter control in the proposed DTC-based induction motor drive system, resulting to a significant reduce of torque ripple. Three-level neutral

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Nikitin, Yury, Pavol Božek, and Jozef Peterka. "Logical–Linguistic Model of Diagnostics of Electric Drives with Sensors Support." Sensors 20, no. 16 (2020): 4429. http://dx.doi.org/10.3390/s20164429.

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The presented paper scientifically discusses the progressive diagnostics of electrical drives in robots with sensor support. The AI (artificial intelligence) model proposed by the authors contains the technical conditions of fuzzy inference rule descriptions for the identification of a robot drive’s technical condition and a source for the description of linguistic variables. The parameter of drive diagnostics for a robotized workplace that is proposed here is original and composed of the sum of vibration acceleration amplitudes ranging from a frequency of 6.3 Hz to 1250 Hz of a one-third-octa

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Xu, Chenhan, Huining Li, Zhengxiong Li, et al. "CardiacWave." Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies 5, no. 3 (2021): 1–26. http://dx.doi.org/10.1145/3478127.

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Using wireless signals to monitor human vital signs, especially heartbeat information, has been intensively studied in the past decade. This non-contact sensing modality can drive various applications from cardiac health, sleep, and emotion management. Under the circumstance of the COVID-19 pandemic, non-contact heart monitoring receives increasingly market demands. However, existing wireless heart monitoring schemes can only detect limited heart activities, such as heart rate, fiducial points, and Seismocardiography (SCG)-like information. In this paper, we present CardiacWave to enable a non

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Oleschuk, V. I. "Synchronous Multi-Zone Modulation for Control of Inverter-Based Power Electronic Systems: Overview of Recent Research." Elektronnaya Obrabotka Materialov 58, no. 5 (2022): 51–70. http://dx.doi.org/10.52577/eom.2022.58.5.51.

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This publication provides a brief overview of the results of recent research works by the author in the field of power electronics, carried out and published mainly in 2019–2021, and awarded with the Premium “Boris Lazarenko” of the Academy of Sciences of Moldova in the field of engineering. The methodological basis of those investigations is an original alternative method of the synchronous multi-zone space-vector modulation of signals of voltage source inverters as the main workhorses of adjustable speed electric drives and renewable energy systems. Therefore, basic strategies, schemes, and

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Moon, Kyeong-Rok, and Dong-Myung Lee. "Analysis of Rotor Position Detection Performance According to the Frequency of Square Waveform Voltage in the Harmonic Injection Sensorless Method through HILS." Processes 9, no. 12 (2021): 2267. http://dx.doi.org/10.3390/pr9122267.

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In this paper, the rotor position estimation performance of the sensorless scheme for permanent magnet synchronous motors (PMSMs) implemented through the injection of high-frequency square-wave voltage according to the frequency of the square-wave voltage is presented through HILS (Hardware In the Loop Simulation) experiments. An inverter using an IGBT device usually has a switching frequency of around 15 kHz. On the other hand, GaN devices that can be switched on and off at frequencies higher than 100 kHz have been recently developed, and research is being actively conducted to apply GaNs to

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Hu, Ting, Hongyi Wan, and Huageng Luo. "Vibration-based synchronous sampling and its application in wind-turbine drive-train-condition monitoring." Clean Energy 5, no. 1 (2021): 79–92. http://dx.doi.org/10.1093/ce/zkaa023.

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Abstract Utilizing shaft-speed information to analyse vibration signals is an important method for fault diagnosis and condition monitoring of rotating machineries, especially for those running at variable speeds. However, in many cases, shaft-speed information is not always available, for a variety of reasons. Fortunately, in most of the measurements, the shaft-speed information is embedded in the vibration response in many different forms, such as in the format of the fundamental shaft-rotation-frequency response and its harmonics, and the gear-meshing-frequency response and its harmonics, e

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Vanin, V., and M. Kruhol. "HYDRAULIC MODELS IN THE PROBLEMS OF THERMAL POWER PLANT AUXILIARY ENERGY EFFICIENCY IMPROVEMENT." Journal of Numerical and Applied Mathematics, no. 1 (135) (2021): 36–42. http://dx.doi.org/10.17721/2706-9699.2021.1.04.

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The work is devoted to the study of thermal power plants auxiliary energy efficiency. The main mechanisms in the auxiliary systems are centrifugal mechanisms that work in complex hydraulic networks with variable productivity. The main ways to adjust the parameters of the centrifugal mechanisms are to change the speed of rotor rotation, change the guide vane angle and throttle. The operation mode of a complex hydraulic network which includes a group of centrifugal mechanisms with a mixed connection scheme is analyzed. The system of equations which characterize the hydraulic system has been obta

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Kulinich, Yu M., S. A. Shukharev, and A. V. Gulyaev. "Increasing the energy efficiency of auxiliary machines of AC electric locomotive." VNIIZHT Scientific Journal 80, no. 5 (2021): 276–84. http://dx.doi.org/10.21780/2223-9731-2021-80-5-276-284.

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Currently, an asynchronous variable frequency drive based on semiconductor converters is widely used due to the relative simplicity and reliability of the design. The use of digital microprocessor systems ensures high accuracy and flexibility of drive control. On the domestic rolling stock, the widespread introduction of asynchronous motors began to replace DC traction motors with sequential excitation. In particular, scalar-controlled asynchronous motors are used on serially produced 2TE25A diesel locomotives and EP20 electric locomotives. The auxiliary asynchronous machines of these locomoti

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Cheng, Hsien-Chie, Yan-Cheng Liu, Hsin-Han Lin, Shian-Chiau Chiou, Chih-Ming Tzeng, and Tao-Chih Chang. "Development and Performance Evaluation of Integrated Hybrid Power Module for Three-Phase Servo Motor Applications." Micromachines 14, no. 7 (2023): 1356. http://dx.doi.org/10.3390/mi14071356.

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This study aims to develop a 30 kHz/12 kW silicon carbide (SiC)/Si integrated hybrid power module (iHPM) for variable frequency drive applications, particularly industrial servo motor control, and, additionally, to theoretically and experimentally assess its dynamic characteristics and efficiency during operation. This iHPM integrates a brake circuit, a three-phase Si rectifier, and a three-phase SiC inverter within a single package to achieve a minimal current path. A space-vector pulse width modulation (SVPWM) scheme is used to control the inverter power switches. In order to reduce parasiti

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Шевченко, І. С., Є. С. Руднєв, and Ю. А. Романченко. "Modeling of the electric drive of the main motion of the rolling cage as a multi-mass electromechanical system." ВІСНИК СХІДНОУКРАЇНСЬКОГО НАЦІОНАЛЬНОГО УНІВЕРСИТЕТУ імені Володимира Даля, no. 4(268) (June 10, 2021): 30–34. http://dx.doi.org/10.33216/1998-7927-2021-268-4-30-34.

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The model of rolling stand of a thick-plate rolling mill 3000 has been designed in the work in order to determine the oscillations frequencies that occur during operation, the effect of their amplitude on the dynamic deviations of the speed of the working body from the specified one.Presented results of the research dynamic to rolling cage 3000 at presentation her as seven masses electromechanic system. Shown influence clearance in mechanical issue on dynamic of the mechanism.The research by the method of mathematical modeling in the design and operation of mechanical equipment is substantiate

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Brooks, D. M. "Variable Frequency AC Drive Systems." IEE Review 34, no. 10 (1988): 414. http://dx.doi.org/10.1049/ir:19880167.

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Ng’ang’a, Emmah Wanjiku, and Martine Oleche Odhiambo. "Drivers of Health Insurance Coverage in Low Income Settlements: A Case of Kibera Informal Settlement, Nairobi County, Kenya." European Scientific Journal, ESJ 19, no. 18 (2023): 94. http://dx.doi.org/10.19044/esj.2023.v19n18p94.

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Insurance is critical for any country's economic growth and development to be sustainable. In rural areas of Kenya, among the illiterate, unemployed, poor, and vulnerable in society, health insurance adoption is extremely low. This paper focuses on determining the drivers for health insurance uptake among low-income populations in Kibera, Nairobi County. Semi structured questionnaires were administered to households located in Kibera informal settlements to collect data. The Yamane (1967) formula was used to select the sample size. Simple random sampling was adopted in selecting 399 respondent

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Kennedy, J. "Variable Frequency AC Motor Drive Systems." Power Engineering Journal 3, no. 2 (1989): 103. http://dx.doi.org/10.1049/pe:19890019.

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Yahaya, N. Z., K. M. Begam, and M. Awan. "Comparative Assessment of Gate Drive Control Schemes in High Frequency Converter." Engineering, Technology & Applied Science Research 1, no. 4 (2011): 76–83. http://dx.doi.org/10.48084/etasr.22.

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Several gate drive control schemes are simulated and the results show that the Fixed Duty ratio (FDR) can help drive synchronous rectifier buck converter (SRBC) correctly with low dead time and hence reduce body diode conduction loss. Even though FDR is prone to cross-conduction effects, the design is simple. Apart from that, Adaptive Gate Delay (AGD) and Predictive Gate Delay (PGD) control schemes have also shown high level of efficiency. However, AGD generates more losses. Even though the total switching loss in PGD has not improved much of only 1 %, more than 82 % efficiency has been achiev

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Aleksandrov, Yevgen, Tetyana Aleksandrova, Alexander Grigoriev, and Yaroslav Morhun. "STABILITY AND VIBRATIONS OF THE ELECTRONIC CLOSED SYSTEM STABILIZING THE COURSE OF A CAR WITH A TANK." Bulletin of the National Technical University "KhPI". Series: Mathematical modeling in engineering and technologies, no. 1 (March 5, 2021): 44–63. http://dx.doi.org/10.20998/2222-0631.2020.01.04.

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To describe the disturbed movement of a car with a tank, a discrete mathematical model has been compiled, which allows one to take into account the oscillations of the free surface of the liquid and determine their effect on the directional stability of the car during uniform movement and during emergency braking. Linearization is carried out and an equation is obtained for the natural frequencies of oscillations of the electrohydromechanical system, which combines dynamic changes in the parameters of the movement of a car with a tank, partial layers of liquid in a tank and the operation of an

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PORZIO, ALBERTO, VIRGINIA D'AURIA, SALVATORE SOLIMENO, STEFANO OLIVARES, and MATTEO G. A. PARIS. "HOMODYNE CHARACTERIZATION OF CONTINUOUS VARIABLE BIPARTITE STATES." International Journal of Quantum Information 05, no. 01n02 (2007): 63–68. http://dx.doi.org/10.1142/s0219749907002529.

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We suggest a scheme to reconstruct the covariance matrix of continuous variable two-mode states using a single homodyne detector and a few polarization elements. Our method can be used to fully characterize the bipartite Gaussian entangled states obtained at the output of a (nondegenerate) optical parametric amplifier driven below threshold, as well as to extract relevant informations on generic bipartite states made of two frequency degenerate but orthogonally polarized modes.

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Meshcheryakov, Victor, and Dmitriy Sibirtsev. "Synchronized Asynchronous Electric Drive with Variable-Frequency Control." Electrotechnical Systems and Complexes, no. 1(38) (2018): 4–8. http://dx.doi.org/10.18503/2311-8318-2018-1(38)-4-8.

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Zhang, Yi Fang, Xiao Qiang Yan, and Qi Hui Ling. "Electromechanical Coupling Vibration of Rolling Mill Excited by Variable Frequency Harmonic." Advanced Materials Research 912-914 (April 2014): 662–65. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.662.

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Using torque telemetry system to test the mechanical drive system of rolling mill,it is found that the torsional vibration and current signal in the electric drive system have the same obviously vibration frequency. The model of cycloconverter, synchronous motor and mechanical drive system of rolling mill are built and analysed by Matlab/Simulink and ANSYS.The simulation results show when the harmonic torque frequency and the torsional vibration natural frequency of for mechanical drive system are equal or close, the strong torsional vibration arouse It is proved that the convertor output curr

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Ronilaya, Ferdian, and Hajime Miyauchi. "A Load Frequency Control in an Off-Grid Sustainable Power System Based on a Parameter Adaptive PID-Type Fuzzy Controller." International Journal of Emerging Electric Power Systems 15, no. 5 (2014): 429–41. http://dx.doi.org/10.1515/ijeeps-2014-0094.

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Abstract This paper presents a new implementation of a parameter adaptive PID-type fuzzy controller (PAPIDfc) for a grid-supporting inverter of battery to alleviate frequency fluctuations in a wind-diesel power system. A variable speed wind turbine that drives a permanent magnet synchronous generator is assumed for demonstrations. The PAPIDfc controller is built from a set of control rules that adopts the droop method and uses only locally measurable frequency signal. The output control signal is determined from the knowledge base and the fuzzy inference. The input-derivative gain and the outp

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Gürbüz, Riza. "Controlling Flow Rate and Fluid Level by Variable Frequency Drive Unit." Archive of Mechanical Engineering 57, no. 4 (2010): 393–404. http://dx.doi.org/10.2478/v10180-010-0022-y.

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Controlling Flow Rate and Fluid Level by Variable Frequency Drive Unit The Variable Frequency Drive (VFD) is used to control the speed of the pumpmotor to attain the desired flow rate and fluid level in a fluid system. An AC drive provides efficient flow control by varying the pump-motor speed. The comparison of energy requirements and costs in a system where a throttling device is used for flow control on a centrifugal pump with the power used when an variable frequency drive (VFD) is used to control the same flow, evidently shows potential savings. In this system, AC Motor Frequency drive an

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Bawa, Mohd Nassurudden Bin Kader, Muhammad Mokhzaini Bin Azizan, and Shamshul Bahar Yaakob. "Application of Variable Frequency Drive (VFD) on Speed Pump." Journal of Advanced Research in Dynamical and Control Systems 11, no. 12-SPECIAL ISSUE (2019): 843–51. http://dx.doi.org/10.5373/jardcs/v11sp12/20193284.

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Song, Xiao Na. "Research on Multi-Speed Control of Variable-Frequency Drive." Applied Mechanics and Materials 538 (April 2014): 425–28. http://dx.doi.org/10.4028/www.scientific.net/amm.538.425.

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This paper introduces a noval experimental teaching project. Different from previous experiment, in this project, three-phase motor can operate at multi-speed mode or continuously variable speed mode controlled by PLC and VFD. The obvious characteristic of the experiment is that the VFD is controlled by PLC automatically. The configuration of the experiment including hardware and software is introduced in detail. The results of the execuation of the PLC program reveals that three-phase motor can operate in two modes according to the instructions from PLC. In addition, the speed can be changed

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Nemikina, Olga V. "The Choice of Supply Cranes with Variable Frequency Drive." ELECTRICAL AND COMPUTER SYSTEMS 19, no. 95 (2015): 54–57. http://dx.doi.org/10.15276/eltecs.19.95.2015.14.

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Handayani, Sri Utami. "KARAKTERISTIK POMPA SENTRIFUGAL ALIRAN CAMPUR DENGAN VARIABLE FREQUENCY DRIVE." ROTASI 15, no. 3 (2013): 30. http://dx.doi.org/10.14710/rotasi.15.3.30-34.

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In an industry that uses large centrifugal pumps continuously, pump speed setting can reduce energy consumption significantly. By changing the speed of a centrifugal pump, capacity, head, and pump power required will change according to pump affinity laws. Speed of a centrifugal pump can be changed by variable frequency drive . This study aimed to investigate the characteristics of mixed flow centrifugal pumps with variable frequency drive. The results showed that 10% of maximum speed reduction can decrease power consumtion until 50%, while the increase in the efficiency is maximum 7.2%. The p

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