Artykuły w czasopismach: „INDIRECT VECTOR CONTROL”

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Guru, Neelakantha, Santosh Kumar Mishra i B. Nayak. "Indirect Vector Control of Multi Cage Induction Motor". International Journal of Computer Applications 68, nr 2 (18.04.2013): 25–32. http://dx.doi.org/10.5120/11552-6829.

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Moore, Sean M., Elizabeth T. Borer i Parviez R. Hosseini. "Predators indirectly control vector-borne disease: linking predator–prey and host–pathogen models". Journal of The Royal Society Interface 7, nr 42 (27.05.2009): 161–76. http://dx.doi.org/10.1098/rsif.2009.0131.

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Pathogens transmitted by arthropod vectors are common in human populations, agricultural systems and natural communities. Transmission of these vector-borne pathogens depends on the population dynamics of the vector species as well as its interactions with other species within the community. In particular, predation may be sufficient to control pathogen prevalence indirectly via the vector. To examine the indirect effect of predators on vectored-pathogen dynamics, we developed a theoretical model that integrates predator–prey and host–pathogen theory. We used this model to determine whether predation can prevent pathogen persistence or alter the stability of host–pathogen dynamics. We found that, in the absence of predation, pathogen prevalence in the host increases with vector fecundity, whereas predation on the vector causes pathogen prevalence to decline, or even become extinct, with increasing vector fecundity. We also found that predation on a vector may drastically slow the initial spread of a pathogen. The predator can increase host abundance indirectly by reducing or eliminating infection in the host population. These results highlight the importance of studying interactions that, within the greater community, may alter our predictions when studying disease dynamics. From an applied perspective, these results also suggest situations where an introduced predator or the natural enemies of a vector may slow the rate of spread of an emerging vector-borne pathogen.

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Li, Guo Hua, i Ji Qiang Wang. "Speed Sensor-Less Indirect Vector Control System Based on a Novel Sliding Mode Control Speed Observer". Advanced Materials Research 383-390 (listopad 2011): 196–201. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.196.

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Vector control is one of the most popular control techniques of induction motors. Owing to its simplicity, the indirect vector control gains increasing popularity. This paper proposes a speed sensor-less indirect vector control system of induction motors based on a novel sliding mode control (SMC) speed observer. The observer uses the stator current difference of the estimated value and the actual value to calculate the rotor speed. The simulation results show that the method has a fast response and high accuracy, and it robust to parameter variations.

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Zerdani, Sara, Mohamed Larbi Elhafyani, Hicham Fadil i Smail Zouggar. "Newly fault-tolerant indirect vector control for traction inverter". International Journal of Power Electronics and Drive Systems (IJPEDS) 12, nr 3 (1.09.2021): 1576. http://dx.doi.org/10.11591/ijpeds.v12.i3.pp1576-1585.

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The traction inverter is a crucial power device in the electric vehicle’s powertrain, and its failure is intolerable as it would considerably compromise the system’s safety. For more reliable driving, installing a traction inverter that is sufficiently resistant to electrical failure is inherent. Due to its compact size and the small number of switches incorporated in three-phase four-switch inverter, this modular topology was used to compensate for the open switch’s failure. However, it is known to have manifold weaknesses mainly distinguished in the low-frequency region. This paper introduces a new fault-tolerant indirect control that handles the IGBT’s failure constituting the traction inverter. The fault compensator is designed first based on the Proportional Integral regulator combined with the notch filter to mitigate the current imbalance and restore the DC voltage equilibrium.Furthermore, to conceive a comprehensive fault-tolerant control, there must therefore contain an accurate fault detector. In this regard, an uncomplicated fault diagnosis method based on the current spectral analysis has been performed. The effectiveness of the submitted controller was validated by simulation using Matlab.

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Blaustein, Leon, Richard S. Ostfeld i Robert D. Holt. "A Community-Ecology Framework for Understanding Vector and Vector-Borne Disease Dynamics". Israel Journal of Ecology and Evolution 56, nr 3-4 (6.05.2010): 251–62. http://dx.doi.org/10.1560/ijee.56.3-4.251.

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The integration of community ecology into the understanding and management of vectors and vector-borne diseases has largely occurred only recently. This compendium examines a variety of community interactions that can affect vector or vector-borne disease dynamics. They include: the importance of risk of predation, risk of ectoparasatism, competition, interactions of competition with transgenic control, apparent competition mediated through vectors, indirect effects of pesticides, vector diversity, and parasite diversity within a vector. In this paper, we summarize these studies and introduce several additional important questions in need of further exploration.

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Khaliq, Arjmand, Syed Abdul Rahman Kashif, Fahad Ahmad, Muhammad Anwar, Qaisar Shaheen, Rizwan Akhtar, Muhammad Arif Shah i Abdelzahir Abdelmaboud. "Indirect Vector Control of Linear Induction Motors Using Space Vector Pulse Width Modulation". Computers, Materials & Continua 74, nr 3 (2023): 6263–87. http://dx.doi.org/10.32604/cmc.2023.033027.

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Tran, Hoan Quoc, Tien Manh Vu i Tuyen Dinh Nguyen. "Space-vector modulation for three-phase indirect matrix converters to reduce common-mode voltage". Science & Technology Development Journal - Engineering and Technology 4, nr 2 (10.04.2021): first. http://dx.doi.org/10.32508/stdjet.v4i2.797.

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This paper presents a space vector modulation strategy for a three-phase indirect matrix converter to reduce the common-mode voltage and maintain the output performance. To reduce the peak value of the common-mode voltage to 57.7% of the input phase voltage, three active voltage vectors are used to generate the desired output voltage with arbitrary amplitude and frequency, instead of using both active and zero voltage vectors as in the traditional space vector modulation strategy. Although the common-mode voltage is reduced, the output waveform quality of the three-phase indirect matrix converter deteriorates due to the absence of the zero voltage vectors. To overcome this problem, the proposed space vector modulation strategy is redesigned to control the rectifier stage of the indirect matrix converter by utilizing three active current vectors instead of two as usual. Consequently, the constant average dc-link voltage is achieved, which can improve the output performance in terms of the output voltage and current harmonic distortion. The simulation is implemented by PSIM software and experimental results are provided to verify the effectiveness of the proposed space vector modulation strategy.

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Nannapaneni, Lavanya, i M. Venu Gopala Rao. "Control of Indirect Matrix Converter by Using Improved SVM Method". Bulletin of Electrical Engineering and Informatics 4, nr 1 (1.03.2015): 26–31. http://dx.doi.org/10.11591/eei.v4i1.311.

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A novel space vector modulation (SVM) method for an indirect matrix converter (IMC) is used to reduce the common -mode voltage (CMV) in the output. The process of selecting required active vectors and to describe the switching sequence in the inverter stage of the IMC is explained in this paper. This novel SVM method used to decrease the peak -to-peak amplitude voltage of CMV without using any external hardware. The other advantage of this SVM method is to reduce the total harmonic distortion of line-to-line output voltage. This new modulation technique is easily implemented through simulation and its results are used to demonstrate the improved performance of the input/output waveforms.

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Alazrag, A., i L. Sbita. "Asynchronous Machine with Wind Turbine IRFO Control". WSEAS TRANSACTIONS ON POWER SYSTEMS 17 (30.06.2022): 141–54. http://dx.doi.org/10.37394/232016.2022.17.15.

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The paper deals with a squirrel cage induction generator connected to the grid through a back-to-back converter driven by vector control. The stator-side converter controls the generator torque by means of an indirect vector control scheme. In order to reduce the system dependence from the mechanical system behavior, a torque loop is used in the current reference calculations. The battery energy storage system (BESS) plays a fundamental role in controlling and improving the efficiency of renewable energy sources. Stochasticity of wind speed and reliability of the main system components are considered. The grid-side converter controls the DC bus voltage and the reactive power in order to accomplish the grid codes. Speed control using flow directional control, indirect conventionally uses proportional integral (PI) type current regulators, which achieve satisfactory objectives on torque and flow dynamics. The objective of this article is to present an indirect vector control strategy with oriented rotor flux using current regulators of the proportional integral (PI) type, applied to an asynchronous machine supplied by a voltage inverter, capable of supplying during restrictive stresses, more satisfactory torque and flux responses. The obtained simulation results upon simulation tests of the global system are developed under the MATLAB / Simulink environment and are satisfactory.

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Usynin, Yu S., Yu S. Smirnov, T. A. Kozina i A. V. Valov. "Pulse-vector control with indirect determination of rotor angular position". Russian Electrical Engineering 84, nr 10 (październik 2013): 566–71. http://dx.doi.org/10.3103/s1068371213100106.

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Ogasawara, S., H. Akagi i A. Nabae. "The generalized theory of indirect vector control for AC machines". IEEE Transactions on Industry Applications 24, nr 3 (maj 1988): 470–78. http://dx.doi.org/10.1109/28.2898.

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Kiran, Nagulapati. "Indirect Vector Control of Three Phase Induction Motor using PSIM". Bulletin of Electrical Engineering and Informatics 3, nr 1 (1.03.2014): 15–24. http://dx.doi.org/10.11591/eei.v3i1.181.

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This paper presents the implementation of indirect vector control of three phase Induction Motor using Hysteresis Band PWM current control and Synchronous Current Control in PSIM environment. In any machine drive system, current control directly influences both flux and torque developed directly. In Hysteresis current control method, actual current tracks the command current within a hysteresis band. There is no difficulty in current control tracking when CEMF is low, but at higher speeds, current controller gets saturated due to higher CEMF and hense becomes difficult to track due to which there will be a phase lag with respect to command current. All such problems are solved using Synchronous Current Control.

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Nannapaneni, Lavanya, i Venu Gopala Rao. "Control of Indirect Matrix Converter by Using Improved SVM Method". International Journal of Power Electronics and Drive Systems (IJPEDS) 6, nr 2 (1.06.2015): 370. http://dx.doi.org/10.11591/ijpeds.v6.i2.pp370-375.

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A novel space vector modulation (SVM) method for an indirect matrix converter (IMC) is used to reduce the common -mode voltage (CMV) in the output. The process of selecting required active vectors and to describe the switching sequence in the inverter stage of the IMC is explained in this paper. This novel SVM method used to decrease the peak -to-peak amplitude voltage of CMV without using any external hardware. The other advantage of this SVM method is to reduce the total harmonic distortion of line-to-line output voltage. This new modulation technique is easily implemented through simulation and its results are used to demonstrate the improved performance of the input/output waveforms.

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Agrawal, Ankit, Rakesh Singh Lodhi i Pragya Nema. "Indirect vector control for induction motor drive using two level and five level inverter". International Journal of Applied Power Engineering (IJAPE) 8, nr 2 (1.08.2019): 134. http://dx.doi.org/10.11591/ijape.v8.i2.pp134-144.

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This paper represent modelling & simulation of indirect vector control for induction motor drive using two level and five level inverter. To overcome of lower order harmonics, THD & speed torque characteristics of three phase squirrel cage induction motor. This paper provides solution through indirect vector control & SPWM technique for multilevel inverter. A comparison and performance of two level and five level inverter are used in motor to control speed, current and torque. Matlab simulation environment are taken to simulate indirect vector control for induction motor drive using two level and five level inverter, so torque ripple minimization, lower order harmonics are reduced, constant speed, constant torque and variable speed variable torque are determined through simulation results. The applications under operating conditions are performed better THD, better reliability in AC drives.

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Abdelsalam, Ahmed K., Mahmoud I. Masoud, Mostafa S. Hamad i Barry W. Williams. "Modified Indirect Vector Control Technique for Current-Source Induction Motor Drive". IEEE Transactions on Industry Applications 48, nr 6 (listopad 2012): 2433–42. http://dx.doi.org/10.1109/tia.2012.2227132.

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Kan, Jingbo, Kai Zhang i Ze Wang. "Indirect vector control with simplified rotor resistance adaptation for induction machines". IET Power Electronics 8, nr 7 (lipiec 2015): 1284–94. http://dx.doi.org/10.1049/iet-pel.2014.0422.

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Domínguez-García, José Luis, Oriol Gomis-Bellmunt, Lluís Trilla-Romero i Adrià Junyent-Ferré. "Indirect vector control of a squirrel cage induction generator wind turbine". Computers & Mathematics with Applications 64, nr 2 (lipiec 2012): 102–14. http://dx.doi.org/10.1016/j.camwa.2012.01.021.

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Kim, Dong Hwa. "GA–PSO based vector control of indirect three phase induction motor". Applied Soft Computing 7, nr 2 (marzec 2007): 601–11. http://dx.doi.org/10.1016/j.asoc.2006.04.001.

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Jain, Jitendra Kumar, Sandip Ghosh i Somnath Maity. "Concurrent PI Controller Design for Indirect Vector Controlled Induction Motor". Asian Journal of Control 22, nr 1 (28.09.2018): 130–42. http://dx.doi.org/10.1002/asjc.1911.

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Emil Hasan, Amilia, Haryani Hassan i Ismadi Bugis. "Variable Speed Vector Control for Induction Motor of Electric Vehicle". Applied Mechanics and Materials 699 (listopad 2014): 759–64. http://dx.doi.org/10.4028/www.scientific.net/amm.699.759.

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This paper presents the speed performance of an induction motor by using a vector control. The control scheme used is an indirect vector control for define speed command. The main focus of this research is to observe on the dynamic speed performance of the induction motor when the command speed is given to the motor. In this study, the system of indirect vector control will be built by using Matlab Simulink. In fact, the expression of exciting flux linkage and electromagnetic torque are used to create a simple embedded system which to find out the effects of flux weakening in motor while, the gain of the speed controller is 100. The result shows that the vector control method will cause immediate the motor speed response with a small electromagnetic torque ripple. Furthermore, the output mechanical torque starts to decrease when the motor speed above the base speed to maintain a constant output power operation. This paper contributes a new algorithm to analysis the system when the speed motor is higher than a base speed.

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Danilin, A. R., i O. O. Kovrizhnykh. "Asymptotic expansion of the solution to an optimal control problem for a linear autonomous system with a terminal convex quality index depending on slow and fast variables". Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta 61 (maj 2023): 42–56. http://dx.doi.org/10.35634/2226-3594-2023-61-03.

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In this paper, we investigate a problem of optimal control over a finite time interval for a linear autonomous system with slow and fast variables in the class of piecewise continuous controls with smooth geometric constraints in the form of a ball. We consider a terminal convex quality index that depends on slow and fast variables. We substantiate a limit relation for the vector determining the optimal control as the small parameter tends to zero. We refine the limit relation for the case of an indirect control problem with a terminal quality index, which is the sum of values of two strictly convex continuously differentiable functions, the first of which depends only on slow variables, and the second one depends only on fast variables and has a minimum at zero. In doing so, we show that the first component of the determining vector converges to the determining vector of the limit problem while the second component tends to zero. In the problem of indirect control of a system of material points in a medium with resistance, we obtain the complete asymptotics of the determining vector in powers of a small parameter.

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KORONDI, PÉTER, SENUG HAK YANG, HIDEKI HASHIMOTO i FUMIO HARASHIMA. "SLIDING MODE CONTROLLER FOR PARALLEL RESONANT DUAL CONVERTERS". Journal of Circuits, Systems and Computers 05, nr 04 (grudzień 1995): 735–46. http://dx.doi.org/10.1142/s0218126695000424.

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The classical DC drive control structure (outer speed control loop and fast inner current control loop) is applied for induction motors. This paper focuses on the inner current control (indirect current control) loop. Three Park vector based VSC (Variable Structure Control) methods (one for input rectifier two for the output inverter) are studied. In the three cases, a complex error vector, a complex sliding surface and a complex distance vector (which indicates the distance of the actual state from the sliding surface) are defined. The inverter is switched in such a way that the system trajectory gets as close to the sliding surface as possible. In spite of the fact that the error vectors have different physical meanings, similar switching strategies can be applied to all cases due to the similarity of mathematical equations. By the proposed method both the low-order harmonics and the audio noise can be reduced.

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Wei, Bin, Ji Bin Hu i Zeng Xiong Peng. "Research on Simulation and Modeling of Split Double-Rotor Motor Based on Indirect Vector Control". Advanced Materials Research 317-319 (sierpień 2011): 672–77. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.672.

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A novel vector control system of the split double-rotor motor based on indirect vector control principle has been proposed. The mathematic models of the primary machine and the secondary machine are set up respectively. Through the coupling of the two models, the system model of the split double-rotor motor is build. Matlab software is used for the simulation and analysis of this indirect vector control system. According to the simulation results, the validity of system model is proved with nicer static and dynamic capability, and without steady-state error in stable state. These are important to analyze and design the double-rotor motor. Furthermore, the results provide the basis for simulation and apply of double-rotor motor in HEV.

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Li, Gang. "Realization of SVM Algorithm for Indirect Matrix Converter and Its Application in Power Factor Control". Advances in Power Electronics 2015 (9.09.2015): 1–10. http://dx.doi.org/10.1155/2015/740470.

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Compared with AC-DC-AC converter, matrix converter (MC) has several advantages for its bidirectional power flow, controllable power factor, and the absence of large energy storage in dc-link. The topology of MC includes direct matrix converter (DMC) and indirect matrix converter (IMC). IMC has received great attention worldwide because of its easy implementation and safe commutation. Space vector PWM (SVM) algorithm for indirect matrix converter is realized on DSP and CPLD platform in this paper. The control of the rectifier and inverter in IMC can be decoupled because of the intermediate dc-link. The space vector modulation scheme for IMC is discussed and the PWM sequences for the rectifier and inverter are generated. And a two-step commutation of zero current switching (ZCS) in the rectifier is achieved. Input power factor of IMC can be changed by adjusting the angle of the reference current vector. Experimental tests have been conducted on a RB-IGBT based indirect matrix converter prototype. The results verify the performance of the SVM algorithm and the ability of power factor correction.

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Behera, Kuldeep, i Subrat Behera. "A Novel Control Strategy of Indirect Matrix Converter Using Space Vector Modulation". International Journal of Power Electronics and Drive Systems (IJPEDS) 7, nr 3 (1.09.2016): 926. http://dx.doi.org/10.11591/ijpeds.v7.i3.pp926-935.

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This paper introduces a control scheme of Indirect Matrix Converter which includes space vector modulation to stabilize the frequency variations. The terminal voltage and frequency of any synchronous machine can be controlled easily with this scheme. Further the control strategy is proposed and implemented in Matlab/Simulink Embedded system which gives significant better performance compared to conventional control technique like better Total Harmonic Distortion (THD), more output voltage with same Modulation Index, less switching stress and less switching loss. This method might prove effective for wind energy conversion system using DFIG as the DFIG speed is close to synchronous speed. The complete control strategy is verified using MATLAB/Simulink.

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Meeker, D. C., i M. J. Newman. "Indirect Vector Control of a Redundant Linear Induction Motor for Aircraft Launch". Proceedings of the IEEE 97, nr 11 (listopad 2009): 1768–76. http://dx.doi.org/10.1109/jproc.2009.2030232.

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Uddin, M. N., T. S. Radwan i M. A. Rahman. "Performances of fuzzy-logic-based indirect vector control for induction motor drive". IEEE Transactions on Industry Applications 38, nr 5 (wrzesień 2002): 1219–25. http://dx.doi.org/10.1109/tia.2002.802990.

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Sünter, Sedat, i Jon C. Clare. "Feedforward indirect vector control of a matrix converter‐fed induction motor drive". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 19, nr 4 (grudzień 2000): 974–86. http://dx.doi.org/10.1108/03321640010347402.

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Ji, Xuande, Huilin Yao i Yunwang Ge. "Performance and Comparison Analysis of Direct Vector Control and Indirect Vector Control for Induction Motor Based on Current Hysteresis Band PWM". Journal of Computational and Theoretical Nanoscience 13, nr 12 (1.12.2016): 10453–60. http://dx.doi.org/10.1166/jctn.2016.6181.

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Podaliri Vulpiani, Michele, Luigi Iannetti, Daniela Paganico, Filomena Iannino i Nicola Ferri. "Methods of Control of theLeishmania infantumDog Reservoir: State of the Art". Veterinary Medicine International 2011 (2011): 1–13. http://dx.doi.org/10.4061/2011/215964.

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Leishmania infantumis a protozoan parasite causing severe vector-borne visceral diseases both in humans and dogs. The latter are the most important natural reservoir and therefore should be the main target of control measures. The real efficacy of seropositive dogs culling as a direct control method is still debated, and the new sensitivity of large part of population considers ethically unacceptable this kind of approach. Treatment of infectious dogs with one of the available therapeutic protocols is recommendable as it allows to reduce parasite burdens and therefore the possibility of transmission ofLeishmania infantumto vectors. Vaccination has been proven to be a very effective control tool, but the absence of a commonly recognized diagnostic method able to distinguish vaccinate from seropositive individuals is still an important limit. Concerning indirect control methods, a number of studies have demonstrated the efficacy of topical insecticides treatment (collars, spot-on, and sprays) in reducing incidence and prevalence ofL. infantum. Also, the reduction of the odds of seroconversion in humans in endemic areas has been reported after the application of indirect control measures on dogs. The contemporary use of direct and indirect methods is even more effective in reducing seroprevalence in dogs.

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Madark, Mhamed, A. Ba-Razzouk, E. Abdelmounim i M. El Malah. "A New Induction Motor Adaptive Robust Vector Control based on Backstepping". International Journal of Electrical and Computer Engineering (IJECE) 7, nr 4 (1.08.2017): 1983. http://dx.doi.org/10.11591/ijece.v7i4.pp1983-1993.

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In this paper, a novel approach to nonlinear control of induction machine, recursive on-line estimation of rotor time constant and load torque are developed. The proposed strategy combines Integrated Backstepping and Indirect Field Oriented Controls. The proposed approach is used to design controllers for the rotor flux and speed, estimate the values of rotor time constant and load torque and track their changes on-line. An open loop estimator is used to estimate the rotor flux. Simulation results are presented which demonstrate the effectiveness of the control technique and on-line estimation.

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Zaffaroni, Marta, Loup Rimbaud, Ludovic Mailleret, Nik J. Cunniffe i Daniele Bevacqua. "Modelling interference between vectors of non-persistently transmitted plant viruses to identify effective control strategies". PLOS Computational Biology 17, nr 12 (28.12.2021): e1009727. http://dx.doi.org/10.1371/journal.pcbi.1009727.

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Aphids are the primary vector of plant viruses. Transient aphids, which probe several plants per day, are considered to be the principal vectors of non-persistently transmitted (NPT) viruses. However, resident aphids, which can complete their life cycle on a single host and are affected by agronomic practices, can transmit NPT viruses as well. Moreover, they can interfere both directly and indirectly with transient aphids, eventually shaping plant disease dynamics. By means of an epidemiological model, originally accounting for ecological principles and agronomic practices, we explore the consequences of fertilization and irrigation, pesticide deployment and roguing of infected plants on the spread of viral diseases in crops. Our results indicate that the spread of NPT viruses can be i) both reduced or increased by fertilization and irrigation, depending on whether the interference is direct or indirect; ii) counter-intuitively increased by pesticide application and iii) reduced by roguing infected plants. We show that a better understanding of vectors’ interactions would enhance our understanding of disease transmission, supporting the development of disease management strategies.

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BIROU, I., V. MAIER, S. PAVEL i C. RUSU. "Indirect Vector Control of an Induction Motor with Fuzzy-Logic based Speed Controller". Advances in Electrical and Computer Engineering 10, nr 1 (2010): 116–20. http://dx.doi.org/10.4316/aece.2010.01021.

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Marwali, M. N., A. Keyhani i W. Tjanaka. "Implementation of indirect vector control on an integrated digital signal processor-based system". IEEE Transactions on Energy Conversion 14, nr 2 (czerwiec 1999): 139–46. http://dx.doi.org/10.1109/60.766961.

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Kancharlapalli, Sri Jyosthsna, Cameron J. Crabtree, Kaz Surowiec, Scott D. Longing i Corey L. Brelsfoard. "Indirect transfer of pyriproxyfen to European honeybees via an autodissemination approach". PLOS Neglected Tropical Diseases 15, nr 10 (14.10.2021): e0009824. http://dx.doi.org/10.1371/journal.pntd.0009824.

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The frequency of arboviral disease epidemics is increasing and vector control remains the primary mechanism to limit arboviral transmission. Container inhabiting mosquitoes such as Aedes albopictus and Aedes aegypti are the primary vectors of dengue, chikungunya, and Zika viruses. Current vector control methods for these species are often ineffective, suggesting the need for novel control approaches. A proposed novel approach is autodissemination of insect growth regulators (IGRs). The advantage of autodissemination approaches is small amounts of active ingredients compared to traditional insecticide applications are used to impact mosquito populations. While the direct targeting of cryptic locations via autodissemination seems like a significant advantage over large scale applications of insecticides, this approach could actually affect nontarget organisms by delivering these highly potent long lasting growth inhibitors such as pyriproxyfen (PPF) to the exact locations that other beneficial insects visit, such as a nectar source. Here we tested the hypothesis that PPF treated male Ae. albopictus will contaminate nectar sources, which results in the indirect transfer of PPF to European honey bees (Apis mellifera). We performed bioassays, fluorescent imaging, and mass spectrometry on insect and artificial nectar source materials to examine for intra- and interspecific transfer of PPF. Data suggests there is direct transfer of PPF from Ae. albopictus PPF treated males and indirect transfer of PPF to A. mellifera from artificial nectar sources. In addition, we show a reduction in fecundity in Ae. albopictus and Drosophila melanogaster when exposed to sublethal doses of PPF. The observed transfer of PPF to A. mellifera suggests the need for further investigation of autodissemination approaches in a more field like setting to examine for risks to insect pollinators.

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Donga, Kan, Li Jun Diaob, Da Nan Sun, Bai Shui Ruan i Zhi Gang Liu. "MRAS-Based Rotor Time Constant Estimation for Indirect Vector Controlled Induction Motor Drive". Advanced Materials Research 433-440 (styczeń 2012): 6812–18. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.6812.

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Decoupling the stator current into magnetizing current and torque current, the vector control technique improves the performance of AC drive system effectively. However, the rotor time constant varies widely with rotor temperature and the flux level of the machine, which decreases the quality of the drive system. By the contrastive analysis of the variable current on-line estimation methods, this paper uses the Model Reference Adaptive System (MRAS) and designs a set of self-adaption estimation arithmetic which has its basis on the Lyapunov theorem of stability. The simulation shows that the estimation arithmetic has the characteristics of fast convergence speed, few stability errors, good track performance and etc. On the basis of simulation of the rotor time constant on-line estimation, this paper designs the system of vector control with the rotor time constant on-line estimation and has the simulation. According to the simulation results, applying the estimation to the vector control system can improve the performance of the system effectively and establish the theoretical basis of the research on the high-performance AC drive system.

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37

Jannati, Mohammad, Tole Sutikno, Nik Rumzi Nik Idris i Mohd Junaidi Abdul Aziz. "A Novel Method for IRFOC of Three-Phase Induction Motor under Open-Phase Fault". International Journal of Power Electronics and Drive Systems (IJPEDS) 6, nr 3 (1.09.2015): 439. http://dx.doi.org/10.11591/ijpeds.v6.i3.pp439-448.

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This paper investigates the vector control of a star-connected three-phase Induction Motor (IM) under stator winding open-phase fault. The used vector control method is based upon indirect rotor field-orientation concepts that have been adapted for this type of machine. Beside the implementation of this method in critical industrial applications, the proposed method in this paper can be used for vector control of unbalanced 2-phase or single-phase IM with two main and auxiliary windings. Simulation results are provided to show the operation of the proposed drive system.

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Benbouhenni, Habib, Zinelaabidine Boudjema i Abdelkader Belaidi. "A comparative study between four-level NSVM and three-level NSVM technique for a DFIG-based WECSs controlled by indirect vector control". Carpathian Journal of Electronic and Computer Engineering 11, nr 2 (1.12.2018): 13–19. http://dx.doi.org/10.2478/cjece-2018-0012.

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Abstract In this work, we present a comparative study between four-level neural space vector modulation (4L-NSVM) and three-level neural space vector modulation (3L-NSVM) technique in indirect vector control (IVC) of reactive and active power control of a doubly fed induction generator (DFIG) for wind energy conversion systems (WECSs). Two controls techniques using IVC-4L-NSVM and IVC-3L-NSVM are proposed and compared. The validity of the proposed control schemes is verified by simulation tests of a DFIG-based wind turbine system (WTSs). The stator active power, stator reactive power and rotor current is determined and compared in the above strategies. The obtained results showed that the proposed IVC with 4L-NSVM technique have reactive and stator active power with low powers ripples and low rotor current harmonic distortion than 3L-NSVM technique.

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PURWANTO, ERA, ABDILLAH AZIZ MUNTASHIR i MUHAMMAD RIZANI RUSLI. "Kendali Motor Sangkar Tupai 3 Phasa berbasis Indirect Field Oriented Control (IFOC) dengan PID Controller". ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 11, nr 3 (25.07.2023): 649. http://dx.doi.org/10.26760/elkomika.v11i3.649.

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ABSTRAKDunia industri sekarang banyak menggunakan motor sangkar tupai 3 phasa, karena memiliki kehandalan yang tinggi, tetapi motor sangkar tupai 3 phasa mempunyai beberapa kekurangan yaitu sukar untuk menjaga pada kecepatan konstan pada saat adanya perubahan beban, serta pengaturan kecepatan yang sulit dilakukan karena sistemnya yang coupled. Dengan melakukan metode vector control yang bebasis pada Indirect Field Oriented Control (IFOC), sehingga pengendalian motor sangkar tupai 3 phasa dapat dilakukan seperti pada DC motor penguat terpisah. PID controller digunakan untuk pengaturan kecepatan, dimana parameter PID didapatkan menggunakan Ziegler Nichols, serta hasil yang didapat adalah luaran kecepatan dengan risetime cepat dan error steady state kecil. Simulasi yang dilakukan telah dilakukan dengan menggunakan LabView, didapatkan respons waktu naik 1.132 ms, waktu penyelesaian 9,91 ms dan error steady 0,4% dengan set poin 500 Rpm. Serta waktu recovery sebesar 4.9 ms pada set poin 300 Rpm.Kata kunci: vector control, motor sangkar tupai 3 phasa, motor DC, coupled, decoupled ABSTRACTThree-phase squirrel cage motors are used today in many industries because of their high reliability. The downside is that speeds are difficult to adjust when connecting to a system. Three-phase cage motor control can be implemented as a discrete DC motor amplifier by using a vector control scheme based on Indirect Field Oriented Control (IFOC), for the speed control the PID controller is used in this system, PID parameters are obtained using Ziegler Nichols, and the result is an output speed , the fast rise time and low stability error. The simulation was run using LabView and had a time response 1.132 ms, a time stedy state is 9.91 ms, and a error flat is 0.4% at a setpoint of 500rpm. So does the time recovery of 4.9ms in speed 300 rpm setpoint.Keywords: vector control, 3-phase squirrel cage, DC motor, coupled, decoupled

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40

Niu, Shuangxia, Yixiao Luo, Weinong Fu i Xiaodong Zhang. "An Indirect Reference Vector-Based Model Predictive Control for a Three-Phase PMSM Motor". IEEE Access 8 (2020): 29435–45. http://dx.doi.org/10.1109/access.2020.2968949.

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41

Funk, Tatiana Andreevna, Yuriy Semenovich Usynin i Evgeniy Viktorovich Belousov. "Indirect Pulse-vector Control of Wound Rotor Induction Motor Drive in ANSYS Electromagnetics Suite". International Journal of Power Electronics and Drive Systems (IJPEDS) 8, nr 3 (1.09.2017): 1147. http://dx.doi.org/10.11591/ijpeds.v8.i3.pp1147-1159.

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This paper deals with the problem of estimation of rotor angular position for the indirect pulse-vector control of wound rotor induction motor drive. The paper considers issues of thematic justification and expanding of the field of using sensorless motor drives. With a view to improve energy consumption readings during design and modernization of motor drives of massive mechanisms with moderate standards for accuracy of velocity control, requiring long-term velocity decrease during load reduction (according to technological process conditions), using the system of the pulse-vector control of wound rotor induction motor is suggested. The paper provides the solution for the problem of developing math models of this motor drive system both for the motor-mounted sensor, and for indirect angular position sensing. The models were developed in ANSYS Electromagnetics Suite using the finite element method for studying electromagnetic processes. Based on the models, the investigation of transition and steady states of a motor drive was carried out, process quality parameters were obtained, namely: max and root-mean-square currents, torques; velocity control errors caused by pulse operation mode. From that simulation, the result illustrates the effectiveness of the proposed approach.

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42

Rosmin, N., i S. J. watson. "Performance analysis of indirect vector control algorithm for small-sized wind turbine induction generator". Energy Procedia 14 (2012): 964–70. http://dx.doi.org/10.1016/j.egypro.2011.12.1040.

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Aaditya, Angga Wahyu, Dedid Cahya Happyanto i Bambang Sumantri. "Application of Sliding Mode Control in Indirect Field Oriented Control (IFOC) for Model Based Controller". EMITTER International Journal of Engineering Technology 5, nr 2 (13.01.2018): 255–69. http://dx.doi.org/10.24003/emitter.v5i2.193.

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Indirect Field Oriented Control (IFOC) is one of the vector control methods that can be applied to induction motor in the industrial world rather than Direct Field Oriented Control (DFOC) because of the flux is obtained from the formulation. However, IFOC can not guarantee the robustness and stability of the systems. Stability analysis such as Lyapunov Stability Theory can be used to make the system stable but not the robustness. Model based controller that can guarantee the stability and robustness such as sliding mode control (SMC) and fuzzy needs to be added in IFOC system to achieve proportional response system. Robust current regulator using sliding mode control was designed in this paper from state space model for model based controller. In transient response and under disturbance SMC shows better performance than PID in rising time and robustness at rotor speed and stator current.

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44

Zhou, Fengyan, i Hongxing Yao. "Dynamics and Biocontrol: The Indirect Effects of a Predator Population on a Host-Vector Disease Model". Abstract and Applied Analysis 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/252718.

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A model of the interactions among a host population, an insect-vector population, which transmits virus from hosts to hosts, and a vector predator population is proposed based on virus-host, host-vector, and prey (vector)-enemy theories. The model is investigated to explore the indirect effect of natural enemies on host-virus dynamics by reducing the vector densities, which shows the basic reproduction numbersR01(without predators) andR02(with predators) that provide threshold conditions on determining the uniform persistence and extinction of the disease in a host population. When the model is absent from predator, the disease is persistent ifR01>1; in such a case, by introducing predators of a vector, then the insect-transmitted disease will be controlled ifR02<1. From the point of biological control, these results show that an additional predator population of the vector may suppress the spread of vector-borne diseases. In addition, there exist limit cycles with persistence of the disease or without disease in presence of predators. Finally, numerical simulations are conducted to support analytical results.

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45

Alsofyani, Ibrahim Mohd, Yeongsu Bak i Kyo-Beum Lee. "Improved Finite Set-Predictive Torque Control of PMSM Fed by Indirect Matrix Converter with Discrete Space Vector Modulation". Electronics 9, nr 12 (13.12.2020): 2133. http://dx.doi.org/10.3390/electronics9122133.

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This study presents finite set-predictive torque control (FS-PTC) with discrete space vector modulation (DSVM) for indirect matrix converter (IMC)-fed permanent magnet synchronous motors (PMSMs). The implementation of FS-PTC with DSVM in an IMC requires high computation time due to the large number of synthesized voltage vectors (VVs). To reduce computation time caused by considering all VVs, a new preselection strategy is proposed to reduce the computational numerations from 37 to 6 VVs. The proposed algorithm can reduce torque and flux ripples and achieve robust characteristics against parameter variations. Additionally, the increased degree of VVs can improve the correlation between the rectifier and inverter sides of the IMC. The effectiveness of the proposed method is verified by simulation and experimental results.

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Essakhi, Hassan, Sadik Farhat, Yahya Dbaghi i Diyae Daou. "Indirect power control of grid-connected photovoltaic system using fuzzy control with a three-level inverter". Indonesian Journal of Electrical Engineering and Computer Science 28, nr 1 (1.10.2022): 76. http://dx.doi.org/10.11591/ijeecs.v28.i1.pp76-87.

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This paper proposes an enhanced study of a photovoltaic generator (PVG) connected to the grid. A fuzzy maximum power point tracking (MPPT) is used to extract maximum power. The control strategy adopted gives the possibility to control separately the active and reactive power. the voltage control at the input of the three levels inverter allows fixing the reference currents in the DQ frame to control indirectly the power injected into the grid. The use of a three-level neutral point clamped voltage source inverter (3L-NPC-VSI) with space vector pulse width modulation (SVPWM) control and the RL filter allows to have a quality current and voltage wave with a minimum total harmonic distortion (THD). The simulation results on MATLAB/Simulink confirm the performance of this proposed strategy in the steady-state with high efficiency.

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47

Jannati, Mohammad, Solieman Eskandari i Tole Sutikno. "Speed Control of 3-phase Induction Motors under Fault Conditions Supplied by Wind Turbine Using Indirect Vector Control". International Journal of Power Electronics and Drive Systems (IJPEDS) 8, nr 1 (1.03.2017): 222. http://dx.doi.org/10.11591/ijpeds.v8.i1.pp222-230.

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This article studies speed control of 3-phase Induction Motors (IMs) under fault conditions supplied by wind turbine using Indirect Vector Control (IVC). The wind turbine plays as a prime mover to a connected DC generator. Pulse Width Modulation (PWM) is used to obtain 3-phase AC voltage from the DC generator output. The proposed modified controller is able to control a star-connected 3-phase IM under normal, stator winding open-circuit fault and speed-sensor fault conditions. Simulation results are presented and shown the performance, validity and possibility of the proposed technique. The results demonstrate that, the proposed scheme provides good dynamic performance especially in reduction of IM speed and torque pulsations.

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Joshi, Girisha, i Pinto Pius A J. "ANFIS controller for vector control of three phase induction motor". Indonesian Journal of Electrical Engineering and Computer Science 19, nr 3 (1.09.2020): 1177. http://dx.doi.org/10.11591/ijeecs.v19.i3.pp1177-1185.

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For variable speed drive applications such as electric vehicles, 3 phase induction motor is used and is controlled by fuzzy logic controllers. For the steady functioning of the vehicle drive, it is essential to generate required torque and speed during starting, coasting, free running, braking and reverse operating regions. The drive performance under these transient conditions are studied and presented. In the present paper, vector control technique is implemented using three fuzzy logic controllers. Separate Fuzzy logic controllers are used to control the direct axis current, quadrature axis current and speed of the motor. In this paper performance of the indirect vector controller containing artificial neural network based fuzzy logic (ANFIS) based control system is studied and compared with regular fuzzy logic system, which is developed without using artificial neural network. Data required to model the artificial neural network based fuzzy inference system is obtained from the PI controlled induction motor system. Results obtained in MATLAB-SIMULINK simulation shows that the ANFIS controller is superior compared to controller which is implemented only using fuzzy logic, under all dynamic conditions.

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Xia, Yihui, Xiaofeng Zhang, Zhihao Ye, Zerun Wang i Liming Huang. "Research on an Optimized Overmodulation Strategy Based on Rectifier of Indirect Space Vector of Matrix Converter". Electronics 11, nr 13 (27.06.2022): 2009. http://dx.doi.org/10.3390/electronics11132009.

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Output performances including voltage error and THD effected by hexagon vector and basic vector with traditional indirect space vector overmodulation method are analyzed, and an improved overmodulation method based on input current vector synthesized is presented. Simulation and experimental results are carried out to validate the effectiveness of the proposed method. Simulation results indicate that the proposed input current vector-synthesized overmodulation strategy has better output performances. The experimental results verify that theoretical analysis is right and the proposed method is feasible.

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Khan, Muhammad Altaf, Saeed Islam, Sher Afzal Khan, Ilyas Khan, Sharidan Shafie i Taza Gul. "Prevention of Leptospirosis Infected Vector and Human Population by Multiple Control Variables". Abstract and Applied Analysis 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/619035.

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Leptospirosis is an infectious disease that damages the liver and kidneys, found mainly in dogs and farm animals and caused by bacteria. In this paper, we present the optimal control problem applied to a dynamical leptospirosis infected vector and human population by using multiple control variables. First, we show the existence of the control problem and then use analytical and numerical techniques to investigate the existence cost effective control efforts for prevention of indirect and direct transmission of this disease. In order to do this, we consider three control functions two for human and one for vector population. We completely characterize the optimal control problem and compute the numerical solution of the optimality system using an iterative method.

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