Journal articles: 'Switch hysteresis control'

1

Dawande, M. S., V. R. Kanetkar, and G. K. Dubey. "Three-phase switch mode rectifier with hysteresis current control." IEEE Transactions on Power Electronics 11, no. 3 (May 1996): 466–71. http://dx.doi.org/10.1109/63.491640.

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Li, Guohua, Liangjun Wang, and Feng Li. "Single-Phase Voltage Source Multi-Level Inverter Hysteresis SVPWM Reconfigurable Fault-Tolerant Control Method." Energies 15, no. 7 (March 31, 2022): 2557. http://dx.doi.org/10.3390/en15072557.

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A hysteresis space vector pulse width modulation (SVPWM) reconfigurable fault-tolerant method for single-phase voltage source multi-level inverter with current tracking is proposed. Firstly, the influence of single switch open circuit fault and double switches open circuit fault on the voltage vector of the inverter is analyzed, and on this basis, the equivalent replacement of the voltage vector is obtained by using the topology reconstruction of the inverter, and the redundant voltage vectors with overlapping positions are preferred for equivalent replacement. If there are no coincident non-fault vectors, the other non-fault vectors with the closest position and effect are selected. The fault-tolerant method does not need the switching operation between the main power switching device and spare power switching device of the inverter, and can directly control the on–off process of the inverter reconfiguration unit through the driving signal of insulated gate bipolar translator (IGBT), which is simple and stable. Under the conditions of single switch open circuit and most double switches open circuit, the output current of the inverter can accurately track the reference current.

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Bolbolnia, Rouhollah, Karim Abbaszadeh, and Mojtaba Nasiri. "Diagnosis and Fault-Tolerant Control of Six-Phase Wind Turbine under Multiple Open-Switch Faults." Mathematical Problems in Engineering 2021 (October 7, 2021): 1–16. http://dx.doi.org/10.1155/2021/9999918.

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A new open-switch fault diagnosis method is proposed in this paper for the six-phase AC-DC converter based on the difference between the phase current and the corresponding reference using an adaptive threshold. The single and multiple open-switch faults are detected without any additional equipment and complicated calculations since the proposed fault detection method is integrated with the hysteresis controller. The proposed fault-tolerant technique reduces the value of overcurrent and total harmonic distortion on the side phases of the faulty one, by changing the switching signal of one switch in its opposite phase in some regions. This technique is performed without adding any legs, switches, or triode for alternating currents to the circuit. Finally, the proposed fault-tolerant technique is evaluated by MATLAB simulation and the results show its effectiveness.

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Gulnizkij, Nikolai, and Gerald Gerlach. "Bistable Threshold Humidity Sensor Switch with Rectangular Bimorph Bending Plate." Micromachines 11, no. 6 (June 3, 2020): 569. http://dx.doi.org/10.3390/mi11060569.

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Energy-autonomous bistable threshold sensor switches have the potential to reduce costs because they do not need any electrical energy supply for monitoring physical quantities, such as relative humidity. In previous work, a bistable beam-like sensor switch with switching hysteresis was manufactured from sheet metal and a partially coated water vapor-sensitive hydrogel (poly(vinyl alcohol)/poly(acryl acid)). Based on the beam theory, a corresponding mechanical model was developed. However, bending plates should be used instead of bending beams to separate the humidity to be measured from the electrical contacts. For this reason, this work deals with the development and realization of a mechanical model based on the plate theory to describe the deflection of a silicon bimorph bending plate partially coated with hydrogel that swells with increasing humidity. For implementing a switching hysteresis a plasma-enhanced chemical vapor deposition silicon dioxide (SiO2) layer is used, which was deposited and structured on top of the silicon plate. The hydrogel layer itself is patterned on the surface of the bending plate using a stamp technique. To validate the mechanical model, the switching hysteresis of the miniaturized sensor switch was measured optically by a camera measurement device.

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Yao, Zhilei, and Lan Xiao. "Two-Switch Dual-Buck Grid-Connected Inverter With Hysteresis Current Control." IEEE Transactions on Power Electronics 27, no. 7 (July 2012): 3310–18. http://dx.doi.org/10.1109/tpel.2011.2179318.

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BOONLONG, KITTIPONG, NACHOL CHAIYARATANA, and SUWAT KUNTANAPREEDA. "OPTIMAL CONTROL OF A HYSTERESIS SYSTEM BY MEANS OF CO-OPERATIVE CO-EVOLUTION." International Journal of Computational Intelligence and Applications 04, no. 04 (December 2004): 321–36. http://dx.doi.org/10.1142/s1469026804001367.

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This paper presents the use of a co-operative co-evolutionary genetic algorithm (CCGA) for solving optimal control problems in a hysteresis system. The hysteresis system is a hybrid control system which can be described by a continuous multivalued state-space representation that can switch between two possible discrete modes. The problems investigated cover the optimal control of the hysteresis system with fixed and free final state/time requirements. With the use of the Pontryagin maximum principle, the optimal control problems can be formulated as optimisation problems. In this case, the decision variables consist of the value of control signal when a switch between discrete modes occurs while the objective value is calculated from an energy cost function. The simulation results indicate that the use of the CCGA is proven to be highly efficient in terms of the minimal energy cost obtained in comparison to the results given by the searches using a standard genetic algorithm and a dynamic programming technique. This helps to confirm that the CCGA can handle complex optimal control problems by exploiting a co-evolutionary effect in an efficient manner.

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Al Quraan, Laith, Laszlo Szamel, and Mahmoud Hamouda. "Optimum Switching Angles Control of SRM for Electric Vehicle Applications." Periodica Polytechnica Electrical Engineering and Computer Science 65, no. 4 (October 29, 2021): 394–403. http://dx.doi.org/10.3311/ppee.17640.

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Switched Reluctance Motor (SRM) drive is being gradually used in industrial applications, including electric vehicles (EVs), due to several advantages over conventional motors. However, the nonlinear magnetic characteristics of the motor make its controller very complicated. This paper presents a simplified procedure to obtain the optimal switching angles under hysteresis current control SRM drive over a wide range of speeds. A multi-objective optimization technique is applied to determine the optimal switch on and switch off angles that achieve the optimum combination of maximum average torque with minimum torque ripple and copper loss. A searching algorithm is developed for each operating point to define the maximum average torque and the minimum torque ripple and copper losses, as they vary for different currents and motor speeds. Then the optimal values of switching angles are stored in the lookup tables to build a MATLAB model of the SRM drive system. Finally, simulation and experimental results are presented to show the validity and effectiveness of the proposed controller.

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Kärnell, Samuel, and Liselott Ericson. "Hysteresis Control in Pump-Controlled Systems—A Way to Reduce Mode-Switch Oscillations in Closed and Open Circuits." Energies 15, no. 2 (January 7, 2022): 424. http://dx.doi.org/10.3390/en15020424.

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There is growing interest in using electric motors as prime movers in mobile hydraulic systems. This increases the interest in so-called pump-controlled systems, where each actuator has its own drive unit. Such architectures are primarily appealing in applications where energy efficiency is important and electric recuperation is relevant. An issue with pump-controlled systems is, however, mode-switch oscillations which can appear when the pressure levels in the system are close to the switching condition. In this paper, the mode-switching behavior of different generalized closed and open circuit configurations is investigated. The results show that the choice of where to sense the pressures has a huge impact on the behavior. They also show that, if the pressure sensing components are properly placed, closed and open circuits can perform very similarly, but that mode-switch oscillations still can occur in all circuits. Active hysteresis control is suggested as a solution and its effectiveness is analyzed. The outcome from the analysis shows that active hysteresis control can reduce the risk for mode-switch oscillations significantly.

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Oyarzún, Diego A., and Madalena Chaves. "Design of a bistable switch to control cellular uptake." Journal of The Royal Society Interface 12, no. 113 (December 2015): 20150618. http://dx.doi.org/10.1098/rsif.2015.0618.

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Bistable switches are widely used in synthetic biology to trigger cellular functions in response to environmental signals. All bistable switches developed so far, however, control the expression of target genes without access to other layers of the cellular machinery. Here, we propose a bistable switch to control the rate at which cells take up a metabolite from the environment. An uptake switch provides a new interface to command metabolic activity from the extracellular space and has great potential as a building block in more complex circuits that coordinate pathway activity across cell cultures, allocate metabolic tasks among different strains or require cell-to-cell communication with metabolic signals. Inspired by uptake systems found in nature, we propose to couple metabolite import and utilization with a genetic circuit under feedback regulation. Using mathematical models and analysis, we determined the circuit architectures that produce bistability and obtained their design space for bistability in terms of experimentally tuneable parameters. We found an activation–repression architecture to be the most robust switch because it displays bistability for the largest range of design parameters and requires little fine-tuning of the promoters' response curves. Our analytic results are based on on–off approximations of promoter activity and are in excellent qualitative agreement with simulations of more realistic models. With further analysis and simulation, we established conditions to maximize the parameter design space and to produce bimodal phenotypes via hysteresis and cell-to-cell variability. Our results highlight how mathematical analysis can drive the discovery of new circuits for synthetic biology, as the proposed circuit has all the hallmarks of a toggle switch and stands as a promising design to control metabolic phenotypes across cell cultures.

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SPIAZZI, G., P. MATTAVELLI, L. ROSSETTO, and L. MALESANI. "APPLICATION OF SLIDING MODE CONTROL TO SWITCH-MODE POWER SUPPLIES." Journal of Circuits, Systems and Computers 05, no. 03 (September 1995): 337–54. http://dx.doi.org/10.1142/s0218126695000217.

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Switch-mode power supplies represent a particular class of variable structure systems (VSS). Thus, they can take advantage of non-linear control techniques developed for this class of systems. In this paper the so called sliding mode control is reviewed and its application to switch-mode power supplies is discussed. Sliding mode control extends the properties of hysteresis control to multi-variable environments, resulting in stability even for large supply and load variations, good dynamic response and simple implementation. Application to dc–dc converters, as well as rectifiers and inverters, is analyzed and provisions to overcome the inherent drawbacks of sliding mode control, i.e. variable switching frequency and possible steady-state errors, are described. Experimental results are also reported, which allow a comparison between the sliding mode approach and other standard control techniques, e.g. current-mode control, showing its effectiveness.

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11

Chen, Liang, Leitao Cui, Rong Huang, and Zhengyun Ren. "Bio-inspired neural network with application to license plate recognition: hysteretic ELM approach." Assembly Automation 36, no. 2 (April 4, 2016): 172–78. http://dx.doi.org/10.1108/aa-11-2015-105.

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Purpose This paper aims to present a bio-inspired neural network for improvement of information processing capability of the existing artificial neural networks. Design/methodology/approach In the network, the authors introduce a property often found in biological neural system – hysteresis – as the neuron activation function and a bionic algorithm – extreme learning machine (ELM) – as the learning scheme. The authors give the gradient descent procedure to optimize parameters of the hysteretic function and develop an algorithm to online select ELM parameters, including number of the hidden-layer nodes and hidden-layer parameters. The algorithm combines the idea of the cross validation and random assignment in original ELM. Finally, the authors demonstrate the advantages of the hysteretic ELM neural network by applying it to automatic license plate recognition. Findings Experiments on automatic license plate recognition show that the bio-inspired learning system has better classification accuracy and generalization capability with consideration to efficiency. Originality/value Comparing with the conventional sigmoid function, hysteresis as the activation function enables has two advantages: the neuron’s output not only depends on its input but also on derivative information, which provides the neuron with memory; the hysteretic function can switch between the two segments, thus avoiding the neuron falling into local minima and having a quicker learning rate. The improved ELM algorithm in some extent makes up for declining performance because of original ELM’s complete randomness with the cost of a litter slower than before.

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12

Markevich, Nick I., Jan B. Hoek, and Boris N. Kholodenko. "Signaling switches and bistability arising from multisite phosphorylation in protein kinase cascades." Journal of Cell Biology 164, no. 3 (January 26, 2004): 353–59. http://dx.doi.org/10.1083/jcb.200308060.

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Mitogen-activated protein kinase (MAPK) cascades can operate as bistable switches residing in either of two different stable states. MAPK cascades are often embedded in positive feedback loops, which are considered to be a prerequisite for bistable behavior. Here we demonstrate that in the absence of any imposed feedback regulation, bistability and hysteresis can arise solely from a distributive kinetic mechanism of the two-site MAPK phosphorylation and dephosphorylation. Importantly, the reported kinetic properties of the kinase (MEK) and phosphatase (MKP3) of extracellular signal–regulated kinase (ERK) fulfill the essential requirements for generating a bistable switch at a single MAPK cascade level. Likewise, a cycle where multisite phosphorylations are performed by different kinases, but dephosphorylation reactions are catalyzed by the same phosphatase, can also exhibit bistability and hysteresis. Hence, bistability induced by multisite covalent modification may be a widespread mechanism of the control of protein activity.

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13

Biricik, Samet, and Hasan Komurcugil. "Three‐level hysteresis current control strategy for three‐phase four‐switch shunt active filters." IET Power Electronics 9, no. 8 (June 2016): 1732–40. http://dx.doi.org/10.1049/iet-pel.2015.0764.

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14

Wang, Gui Xing, Chun Lei Xu, Hong Zhang, Hao Yan, and Chun Yue Yang. "Research on Three-Phase VIENNA Converter for PFC." Applied Mechanics and Materials 385-386 (August 2013): 1193–96. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.1193.

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In order to get the stable output, the small switch pressure resistance and the high power factor with the high power three-phase rectifier, the three-phase VIENNA PFC circuit topology was studied, and the principle of VIENNA rectifier was investigated, based on the original concept of the control method, the interval control with hysteresis control method were used to control the whole rectifier circuit. Throughout the system design had been completed, the MATLAB model is built for the design of the circuit simulation, the simulation results show that the system output is stabilizing output, and the pressure resistance of the switch device is half of the output voltage, and the input power factor is 1.And set up some small prototype to verify the control method of the rectifier.

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Zhang, Xian Jin, and Yong Xian Song. "A SPWM Control Method for Dual Buck Half Bridge Inverter Based on the Direction of Inductor Current." Applied Mechanics and Materials 128-129 (October 2011): 784–88. http://dx.doi.org/10.4028/www.scientific.net/amm.128-129.784.

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The Dual Buck Half Bridge inverter has been widely researched because of no bridge arm shoot-through problem and higher efficiency. Because the switch frequency always varies, the output filter parameters are very difficult to optimally design by using hysteresis current control. In this paper, a SPWM control method is proposed. The control method not only can be easy realized, but also get the no-biased current model. Finally, the proposed SPWM control method is verified by the simulation and experiment results.

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Li, Jun Wei, Zhen Dong Zhang, and Yuan Yuan Ni. "Speed Control of Switched Reluctance Motors Drive System Based on Fuzzy Control." Advanced Materials Research 732-733 (August 2013): 1115–18. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.1115.

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The switch reluctance motor (SRM) speed control system is often difficult to control due to its nonlinearities and parameter variations. In this paper, a fuzzy logic control (FLC) system has been presented to speed control of the SRM. The control system is composed of speed controller and current controller. The main task of the speed controller is to provide the appropriate control signal to the current controller based on the difference between the desired speed and the actual speed of the motor. In the speed control part, the fuzzy controller is used to reject the unknown and uncertain parameters in the SRM and in the load torque. The current controller evaluates the difference between the actual and the desired phase current and implements hysteresis current control. Simulation results demonstrate the effectiveness of the proposed control strategy under different operating conditions of the SRM.

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Mariam, Marah, and Hassan Kenjrawy. "Improving Electrical Power Quality in Distribution Networks using a Unified Power Quality Conditioner (UPQC) Controlled by an Adaptive Hysteresis Band." Journal of Materials Science and Engineering with Advanced Technology 23, no. 2 (July 10, 2021): 91–109. http://dx.doi.org/10.18642/jmseat_7100122190.

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Recently the use of sensitive electronic devices has increased, and the quality of energy has become an important factor in electrical power systems, where disturbances occurring in the network (harmonics, swell, voltage sag, etc.) affect consumers and lead to technical-economic damages. One of the most prominent solutions to address energy quality problems is the UPQC (Unified Power Quality Conditioner). In this paper, the unified power quality conditioner used to improve the electrical power quality in the distribution networks was discussed, where the Park transformations are used to obtain the required reference signals, and also the use of adaptive hysteresis band to generate the electronic switch pulses in both serial and shunt switches, where the pulse width is determined by dependence on fuzzy logic. The studied system was validated by simulating different distortion cases and comparing the results when using the Sinusoidal Pulse Width Modulation (SPWM) to control the two switches. The results showed improvement in the electrical power quality through the use of an adaptive hysteresis band controller, and that appeared by reducing the total distortion factor (THD%), which resulted in improving the shape of both the voltage and current waveforms.

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Balamurugan, R., and R. Nithya. "FC/PV Fed SAF with Fuzzy Logic Control for Power Quality Enhancement." International Journal of Power Electronics and Drive Systems (IJPEDS) 5, no. 4 (April 1, 2015): 470. http://dx.doi.org/10.11591/ijpeds.v5.i4.pp470-476.

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In this paper, a Fuel cell (FC) / Photovoltaic cell (PV)/ Battery operated three phase Shunt Active power Filter (SAF) is proposed for improving the power quality at the utility side. Fuzzy based instantaneous p-q theory control is proposed for SAF. This SAF consists of Voltage Source PWM Converter (VSC) and a DC link capacitor supplied by a FC/PV/Battery. The filter provides harmonic mitigation with reactive power compensation and neutral compensation for loads at the Point of Common Coupling (PCC). A Single switch boost DC-DC converter connects the FC/PV/Battery with the VSC to maintain the load. The performance of the proposed SAF is tested in MATLAB / SIMULINK environment with Fuzzy logic controller (FLC). The controller maintains the DC link voltage based on the current reference generated by the p-q theory. The Hysteresis PWM current controller is employed to generate the gating pulses to the switches in VSC. The simulation results of the proposed SAF validate the effectiveness of FLC in power quality enhancement.

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Li, Xiaofei, Haichao Wang, and Xin Dai. "A Power and Data Decoupled Transmission Method for Wireless Power Transfer Systems via a Shared Inductive Link." Energies 11, no. 8 (August 18, 2018): 2161. http://dx.doi.org/10.3390/en11082161.

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Wireless Power Transfer (WPT) technology is gaining global popularity. However, in some applications, data transmission is also required to monitor the load states. This paper presents an alternative wireless power and data transmission method via the shared inductive link. With the method, the system presents three characteristics: (1) controllability and stability of the output voltage; (2) miniaturization in volume of the system; (3) decoupled transmission of power and data. The output voltage control is realized by a non-inductive hysteresis control method. In particular, data is transferred when the power transmission is blocked (i.e., the hysteresis switch is off). The interference between power and data transmission is very small. The signal to noise ratio (SNR) performance which is relevant to the interference from power transfer to data transfer and data transfer capacity, is studied and optimized. Both simulation and experimental results have verified the proposed method.

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Yu-Kang Lo, Huang-Jen Chiu, and Wen-Tsair Li. "A reduced hysteresis controller for a four-switch three-phase bidirectional power electronics interface." IEEE Transactions on Industrial Electronics 46, no. 4 (August 1999): 864–66. http://dx.doi.org/10.1109/tie.1999.778262.

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Wang, Yazhou, Xinbo Ruan, Yang Leng, and Ying Li. "Hysteresis Current Control for Multilevel Converter in Parallel-Form Switch-Linear Hybrid Envelope Tracking Power Supply." IEEE Transactions on Power Electronics 34, no. 2 (February 2019): 1950–59. http://dx.doi.org/10.1109/tpel.2018.2835640.

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22

Patil, Ganesh U., Alfredo Fantetti, and Kathryn Matlack. "Frictional instability: A nonlinear mechanism to control shear wave responses in rough contact-based metamaterials." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A38—A39. http://dx.doi.org/10.1121/10.0015463.

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Incorporating nonlinearity in periodic media not only enables enriched wave dynamics but also allows passive tunability of the wave responses. However, studies so far have been mostly focused on nonlinear mechanisms and responses of longitudinal wave propagation whereas shear propagation in the presence of strong nonlinearity is yet to be fully understood. In this talk, we study shear wave propagation through metamaterials with rough contacts including friction. The roughness of contacting surfaces results in structural instability causing the contacts to switch between different regimes—stick, partial slip, and gross slip—giving rise to strong nonlinearity. Moreover, due to the presence of friction, the contacts exhibit hysteretic nonlinearity, i.e., history-dependent response. In this study, we first experimentally evaluate the frictional properties of rough contacts by measuring high-frequency friction hysteresis loops. Then, we develop metamaterial with a periodic arrangement of these rough contacts and use the obtained frictional properties to numerically study nonlinear shear wave signatures. We evaluate higher harmonic generation and demonstrate how they can be tuned through excitation wave amplitude, external precompression, and surface roughness. These fundamental understandings can open new avenues for designing tailored material with memory-dependent nonlinearity for controlling shear wave propagation.

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Sahoo, N. C., R. Vejian, and R. Gobbi. "Using PSpice for Teaching Output Current Control in D.C.-A.C. Inverters to Undergraduate Students." International Journal of Electrical Engineering & Education 45, no. 4 (October 2008): 356–70. http://dx.doi.org/10.7227/ijeee.45.4.8.

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In the present day technology of power semiconductor drives, d.c.-a.c. switch-mode voltage source inverters are widely used in a.c. motor servo drives. In these applications, the motor phase currents need to be controlled for high performance. Thus, the prime control issue is to obtain the switching signals for the inverter switches in order to control/regulate the inverter output current. There are various standard ways to derive the switching signals for the inverter. Undergraduate students of electrical engineering should know these basics and get hands-on experience of the inverter current control techniques while taking a course on Power Electronics and Drives. This paper discusses an efficient way of teaching current control in d.c.-a.c. voltage source inverters by computer simulation studies using the student version of PSpice (Release 9.1). Three standard methods have been demonstrated, i.e., triangular carrier method, hysteresis band method, and periodic sampling method. This paper can be used by students for self-study as well as by instructors for simulation-based laboratory experiments.

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Snyder, Harold L. "High Temperature Isolated Switch Mode Power Supply with Integrated Power and Feedback Transformer." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2014, HITEC (January 1, 2014): 000214–17. http://dx.doi.org/10.4071/hitec-wp13.

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High temperature switch mode power supplies (SMPS) typically utilize magnetic solutions such as low permeability transformers for isolation from ground loops. However, imposed design constraints almost always restrict the size of switch mode power supply systems to less than the minimum space necessary for a good design, resulting in only adequate and sometimes unreliable switch mode power supply designs. Integrating the control loop and magnetic system functions is implemented by taking advantage of the bi-directional characteristics of transformers, which allows the designer an opportunity to further minimize the design space by eliminating unnecessary loop components. This is a prudent step prior to the construction of high temperature hybrids and multichip modules. Combining the operation of both the control loop and the magnetic transformer allows the designer to reduce the size of the design, regain the ability to provide a good design in the volume allotted, while still maintaining loop stability. The design procedure for this integrated control loop and magnetics system is examined, and an example circuit is simulated in SPICE with a Jiles-Atherton hysteresis model, and the circuit is realized through construction and measurements which are presented for a single forward based design targeted for operation at high temperatures.

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Furutani, Katsushi, and Taizo Makino. "Influence of Matrix Circuit Switching Device Junction Capacitance on Piezoelectric Actuator Drive Performance." International Journal of Automation Technology 3, no. 3 (May 5, 2009): 313–18. http://dx.doi.org/10.20965/ijat.2009.p0313.

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Piezoelectric actuators are widely used as fine-motion actuators for positioning devices. Current pulse driving reduces displacement hysteresis, and the drive circuit provides current pulses considered constant charge pulses to the piezoelectric actuator. The circuit for devices with multiple degrees of freedom using multiple piezoelectric actuators should be simple. Matrix circuits are used to drive liquid crystal displays to reduce the number of drive-circuit control signals and components. A group of 2 × 2 piezoelectric actuators was driven alternately using a 4-switch matrix circuit, and two field effect transistors were used as a fast matrix circuit switch. Piezoelectric actuator drive performance was studied in the case of using the current pulse circuit and the matrix circuit. When the matrix circuit drove actuators performing as capacitive loads, switching device junction capacitors adversely affected drive performance.

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Liao, Mian, Ling Yun Kong, and Hong Liang Ding. "Design of an Analog Control Circuit for the Automatic Sun-Tracking PV Bracket System." Advanced Materials Research 1049-1050 (October 2014): 678–81. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.678.

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This paper designed an analog control circuit which can automatically track the sun for PV bracket system to improve the solar cell photo-electricity conversion efficiency. The sunlight intensity can be real-time detected by sampling the short-circuit current of solar cell. The PV bracket system can be automatically adjusted to achieve a final horizontal angle and pitch angle by using the hysteresis comparator and dedicated motor driver chip, which always makes photovoltaic modules toward the sun's position. At the same time, the PV bracket system can be automatically reset by the hall switch when the sun reaches the sunset and the light intensity is less than the reference value. The experimental prototype is used to testify the correctness and reliability of the control system, which has better practicability and value to extend.

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Kolluru, Ashok Kumar, and Malligunta Kiran Kumar. "Artificial neural network vector controlled common high-side switch asymmetric converter fed switched reluctance motor drive." Indonesian Journal of Electrical Engineering and Computer Science 24, no. 2 (November 1, 2021): 697. http://dx.doi.org/10.11591/ijeecs.v24.i2.pp697-703.

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The best alternative machine for synchronous and induction machine is switched reluctance machine for various applications. An artificial neural network (ANN) based vector controller is implemented for novel converter to drive switched reluctance motor (SRM) in this paper. To reduce the cost and simplified the controller an effective configuration of converter is proposed with only 4 pulse-withmodulation (PWM) based switches. The 6 pole stator and 4 pole rotor machine is considered in this paper to present results based on MATLAB. The ripples in torque are reduced by proposing vector controller by using novel configuration of converter. Generally SRM machines are having high ripples in torque, hence less number of switches will be feasible solution to drive the machine in order to reduce ripples. The proposed controller can also help to operate system with less ripples in torque since the controller having both torque and flux hysteresis controllers. The extensive results are presented on Simulink platform to validate the proposed method under both steady state as well as transient conditions.

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Huo, Zhi Cheng, Guang Xu Ren, Jia Ying Gao, and Guo Bao Ding. "Design of Inverter Based on the Soft-Switched of High Frequency Pulse DC Loop." Advanced Materials Research 834-836 (October 2013): 1114–17. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1114.

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Design a DC/AC converter based on simplex single voltage source high frequency pulse DC loop technology, the output is 115V400Hz, 0.9KVA and the input is three phase alternating current. The forward part is DC/DC converter which provides pulse D.C. to the back part DC/AC converter. Implement soft-switch by changing the on-off state of switching tubes on the inversion arm path at the zero-voltage instant of the pulse direct current, no need of the auxiliary resonant net. The system takes three-state DPM current hysteresis control mode, gets good performance on output wave and efficiency.

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Li, Ying, Xinbo Ruan, Yazhou Wang, and Chengxiang Zhang. "Hysteresis Voltage Prediction Control for Multilevel Converter in the Series-Form Switch-Linear Hybrid Envelope Tracking Power Supply." IEEE Transactions on Power Electronics 35, no. 12 (December 2020): 13663–72. http://dx.doi.org/10.1109/tpel.2020.2994907.

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Lee, Kye-Shin. "Macro Model for Discrete-Time Sigma‒Delta Modulators." Electronics 11, no. 23 (December 2, 2022): 3994. http://dx.doi.org/10.3390/electronics11233994.

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This work presents a macro model for discrete-time sigma‒delta modulators, which can significantly reduce the simulation time compared to transistor level circuits. The proposed macro model is realized by effectively combining active and passive ideal circuit components with Verilog-A modules. As such, since the macro model is a true representation of the actual transistor level circuit, a moderately good accuracy can be obtained. In addition, the proposed macro model includes the major amplifier, comparator, and switch‒capacitor non-idealities of the sigma‒delta modulator such as amplifier DC gain, GBW, slewrate, comparator bandwidth, hysteresis, parasitic capacitance, and switch-on resistance. The results show the simulation time of the proposed macro model sigma‒delta modulator is only 6.43% of the transistor level circuit with comparable accuracy. As a result, the proposed macro model can facilitate the circuit design and leverage non-ideality analysis of discrete-time sigma‒delta modulators. As a practical design example, a second order discrete-time sigma‒delta modulator with a five-level quantizer is realized using the propose macro model for GSM and WCDMA applications.

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Motoi, Naoki, Kenta Sasahara, and Atsuo Kawamura. "Switching Control Method for Stable Landing by Legged Robot Based on Zero Moment Point." Journal of Robotics and Mechatronics 25, no. 5 (October 20, 2013): 831–39. http://dx.doi.org/10.20965/jrm.2013.p0831.

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This paper proposes a switching control method to achieve a smooth transition from an edge landing to a sole landing for a legged robot. When a biped robot walks, an undesirable condition at the moment of landing, such as hunting between the ground and the foot, may occur for several reasons. To avoid this condition, this paper focuses on a method that uses simple controllers to ensure a smooth transition from an edge landing to a sole landing. In the event of an edge landing, a force controller should be implemented for a smooth transition to a sole landing. This is because the force controller enables the foot to contact the ground softly. After the landing state is shifted to the sole landing, the control method should be changed to the position controller. Therefore, it is necessary to switch the control method according to the contact condition between the foot and the ground. To avoid the chattering of the controller switching, several hysteresis values are used for the zeromoment point (ZMP) position and ZMP velocity in the switching function. Simulations and experimental results confirmed the validity of the proposed method.

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Liu, Rongsheng, Zekai Wang, Pengshuo Jia, Guishan Yan, Tiangui Zhang, Chunyu Jia, and Gexin Chen. "Research on Pressure Control of an Electro-Hydraulic Servo System Based on Sliding-Mode Variable-Structure Direct Torque Control." Processes 11, no. 1 (December 29, 2022): 92. http://dx.doi.org/10.3390/pr11010092.

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Taking a direct-drive volume control (DDVC) electro-hydraulic servo system as the research object and aiming at the problems of the servo motor torque fluctuation, high-precision system pressure control, and dynamic response of the system, based on traditional motor direct torque control (DTC), a motor direct torque control method based on a sliding-mode variable structure is proposed to control the system pressure. The motor torque loop is part of the inner control loop and has a rapid dynamic response speed, resulting in higher pressure control accuracy. A nonlinear mathematical model was established for the DDVC electro-hydraulic servo system. The switch meter hysteresis controller in the traditional DTC system was replaced with space vector pulse-width modulation technology. Then, the PID control module in space vector modulation technology was replaced with high-order sliding-mode variable-structure control. Through the coupling relationship between the electric machine and the constant-displacement pump, the pressure can be controlled with high precision using motor torque control. Finally, using the MATLAB/Simulink simulation platform and the DDVC electro-hydraulic servo system simulation model, the proposed theoretical approach to torque control was verified on the basis of simulations and experiments, and the performance with regard to pressure control in the hydraulic system was observed. The simulation and experimental results show that the designed torque control is able to effectively reduce the motor torque fluctuation and improve the dynamic response characteristics of the system. The system pressure control is superior to traditional pressure control methods based on speed regulation, and it has higher control accuracy and a better dynamic response.

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Majka, Łukasz, Bernard Baron, and Paweł Zydroń. "Measurement-Based Stiff Equation Methodology for Single Phase Transformer Inrush Current Computations." Energies 15, no. 20 (October 17, 2022): 7651. http://dx.doi.org/10.3390/en15207651.

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The present paper describes the research on the mechanism of inrush current formation in a modern single-phase transformer, in which the insulation system must withstand the stresses arising during these transient states. A complete and measurement-verified method for determining the transformer inrush current waveforms and other signals (e.g., fluxes and voltages) is developed. This method makes it possible to determine a steady state solution. However, on account of the electromagnetic phenomena, the solving process is long. To analyze the transient dynamic response of the tested transformer, a nonlinear model was assumed, from which the stiff differential equations were derived. The simulation analyses were performed using dedicated software written in C# with the original implementation of the five-stage Radau IIA algorithm selected from the known variants of the Runge–Kutta implicit methods. The calculations were based on the measurement waveforms recorded during transient (switch-on) and steady-state states when the transformer was not loaded. The full magnetization curve of the core sheets of the tested transformer with an original implementation of the polynomial fitting mechanism was applied. As a representative example and for the purposes of experimental verification of numerical tests, the worst case scenario for switch-on of an unloaded transformer was applied (switch-on is performed when the supplied voltage is zero). Phenomena related to the obtained experimental results, such as saturation and hysteresis, are discussed as well.

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Putra, Tri Yogi, and Muldi Yuhendri. "Implementasi Hysterisis Current Control Pulse Witdh Modulation (HCCPWM) Untuk Inverter 3 Fasa." JTEIN: Jurnal Teknik Elektro Indonesia 2, no. 1 (March 23, 2021): 91–97. http://dx.doi.org/10.24036/jtein.v2i1.127.

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Based on the source used, there are several types of converters, one of which is a voltage source converter (VSC). In this study, using a converter that can work as an inverter. In industry, an inverter is useful for supplying the AC voltage source from industrial plants with DC sources, by varying the voltage and output frequency of the inverter. The method used is the HCCPWM generation method or Hysterisis Current Control Pulse Witdh Modulation. This method was chosen because it has several advantages which are good stability, very fast transient response and good accuracy. To activate HCCPWM, a 3 phase reference current signal is first made in the Matlab Simulink, this reference current is then compared with the actual current from the current sensor, then the error is controlled with the hysteresis band. In Arduino mega2560, the pulses generated by HCCPWM in the Matlab Simulink are converted into a duty cycle. The modulated pulse generated by the Arduino PWM pin will be increased using a gate drive circuit, so that the voltage is obtained according to the voltage required by the Mosfet to activate the switch. The results of the tests that have been done show that the voltage source converter (VSC) designed in this study has worked well as intended. This can be seen from the actual current from the current sensor which has been compared with the reference voltage using the HCCPWM method which is included in the Simulink Matlab program.

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Prasadarao K, V. S., K. V. Krishna Rao, P. Bala Koteswara Rao, and T. Abishai. "Power Quality Enhancement in Grid Connected PV Systems using High Step Up DC-DC Converter." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 2 (April 1, 2017): 720. http://dx.doi.org/10.11591/ijece.v7i2.pp720-728.

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Renewable energy sources (RES) are gaining more importance in the present scenario due to the depletion of fossil fuels and increasing power demand. Solar energy is the one of the most promising as it is clean and easily available source. The voltage obtained from the PV system is low. This voltage is increased by high step up dc-dc converter which uses only one switch leads to low switching losses and hence the efficiency of this converter is high. To get the good response this converter is operated in closed loop manner. Integration of PV system with existing grid has so many issues like distorted voltage, current and reactive power control etc. This paper presents a four leg inverter which works on hysteresis current control technique to address the power quality issues like reactive power compensation, balanced load currents and compensation of neutral current. The switching to the inverter is designed in such a way that it supplies the extra current to stabilise the current of the grid that is being supplied to the loads. Finally, the proposed technique is validated by using mat lab/Simulink software and corresponding results are presented in this paper.

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Shobha, R., S. Suntrakanesh, and N. Narmadhai. "DC-DC Converter Implementing Soft Switching Technique for AC Power Applications." March 2022 4, no. 1 (May 25, 2022): 40–51. http://dx.doi.org/10.36548/jitdw.2022.1.005.

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Global warming alerts the world to switch over to using Electric Vehicle (EV) and Hybrid Electric Vehicles (HEV). The Bidirectional DC-DC Converter (BDC) plays a significant role in controlling the energy flow for the Battery Ultra-capacitor Energy Storage System (BUESS) which is used for storing energy in EV or HEV. The bidirectional DC-DC converter (BDC) plays a vital role in controlling the energy flow for BUESS. The bidirectional DC-DC converter performs the step-up and step-down operation at zero voltage switching, as it operates in buck and boost modes. Due to the uncertain nature of renewable energy resources they pose to be not suitable for standalone applications as the only source of power. This problem can be overcome with the aid of batteries and supercapacitors for storing energy. Fast charging is done by a supercapacitor and slow discharging by a battery. A hysteresis control loop achieves the design of charging and discharging status. A BDC in addition to an inverter can be opted and is implemented in MATLAB/Simulink, and is used in AC power applications.

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May, Andrew F., Jiaqiang Yan, Raphael Hermann, Mao-Hua Du, and Michael A. McGuire. "Tuning the room temperature ferromagnetism in Fe₅GeTe₂ by arsenic substitution." 2D Materials 9, no. 1 (November 17, 2021): 015013. http://dx.doi.org/10.1088/2053-1583/ac34d9.

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Abstract In order to tune the magnetic properties of the cleavable high-Curie temperature ferromagnet Fe 5 − x GeTe2, the effect of increasing the electron count through arsenic substitution has been investigated. Small additions of arsenic (2.5% and 5%) seemingly enhance ferromagnetic order in polycrystalline samples by quenching fluctuations on one of the three magnetic sublattices, whereas larger As concentrations decrease the ferromagnetic Curie temperature (T C) and saturation magnetization. This work also describes the growth and characterization of Fe4.8AsTe2 single crystals that are structurally analogous to Fe 5 − x GeTe2 but with some phase stability complications. Magnetization measurements reveal dominant antiferromagnetic behavior in Fe4.8AsTe2 with a Néel temperature of T N ≈ 42 K. A field-induced spin-flop below T N results in a switch from negative to positive magnetoresistance, with significant hysteresis causing butterfly-shaped resistance loops. In addition to reporting the properties of Fe4.8AsTe2, this work shows the importance of manipulating the individual magnetic sublattices in Fe 5 − x GeTe2 and motivates further efforts to control the magnetic properties in related materials by fine tuning of the Fermi energy or crystal chemistry.

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Kashinath, Karthik, Larry K. B. Li, and Matthew P. Juniper. "Forced synchronization of periodic and aperiodic thermoacoustic oscillations: lock-in, bifurcations and open-loop control." Journal of Fluid Mechanics 838 (January 22, 2018): 690–714. http://dx.doi.org/10.1017/jfm.2017.879.

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Synchronization is a universal concept in nonlinear science but has received little attention in thermoacoustics. In this numerical study, we take a dynamical systems approach to investigating the influence of harmonic acoustic forcing on three different types of self-excited thermoacoustic oscillations: periodic, quasi-periodic and chaotic. When the periodic system is forced, we find that: (i) at low forcing amplitudes, it responds at both the forcing frequency and the natural (self-excited) frequency, as well as at their linear combinations, indicating quasi-periodicity; (ii) above a critical forcing amplitude, the system locks in to the forcing; (iii) the bifurcations leading up to lock-in and the critical forcing amplitude required for lock-in depend on the proximity of the forcing frequency to the natural frequency; (iv) the response amplitude at lock-in may be larger or smaller than that of the unforced system and the system can exhibit hysteresis and the jump phenomenon owing to a cusp catastrophe; and (v) at forcing amplitudes above lock-in, the oscillations can become unstable and transition to chaos, or switch between different stable attractors depending on the forcing amplitude. When the quasi-periodic system is forced at a frequency equal to one of the two characteristic frequencies of the torus attractor, we find that lock-in occurs via a saddle-node bifurcation with frequency pulling. When the chaotic system is forced at a frequency close to the dominant frequency of its strange attractor, we find that it is possible to destroy chaos and establish stable periodic oscillations. These results show that the open-loop application of harmonic acoustic forcing can be an effective strategy for controlling periodic or aperiodic thermoacoustic oscillations. In some cases, we find that such forcing can reduce the response amplitude by up to 90 %, making it a viable way to weaken thermoacoustic oscillations.

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Surdacki, Paweł, and Łukasz Woźniak. "Influence of the HTS Winding Tape on Limiting the Transient Currents in Superconducting Transformers." Energies 15, no. 5 (February 24, 2022): 1688. http://dx.doi.org/10.3390/en15051688.

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The article presents an extended computer model of a HTS (high temperature superconducting) 21 MVA 70/10.5 kV transformer with severalfold compound windings, based on a verified PSpice model of 10 kVA transformer with single windings. Two superconducting tapes: SCS12050 (with a copper stabiliser layer) and SF12050 (without a stabiliser) were used in the windings. The circuit model of the transformer developed in the PSpice environment considers Rhyner’s power law and the Jiles–Atherton description of the magnetic hysteresis loop. Two types of transient states were analysed: switching on a superconducting transformer to the network and an emergency short-circuit of the secondary winding. For the first five unidirectional current pulses generated when connecting an unloaded transformer to the network, the values of the pulse duration (γ angle), the temperature increase in the primary winding as well as the mean and effective values of the switch-on current were calculated. The waveforms of currents, voltages, changes in resistance and temperature during the operation short-circuit were compared for the windings with both types of HTS 2G (high temperature superconductor second generation) tapes. The conducted analysis allowed us to determine the influence of electrical and thermal parameters of the tapes in question on the effective limitation of current in transient states and the possibility of their use in the construction of superconducting transformer windings.

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Upadhyay, Deepak, Shahbaz Ahmad Khan, Mohammad Ali, Mohd Tariq, Adil Sarwar, Ripon K. Chakrabortty, and Michael J. Ryan. "Experimental Validation of Metaheuristic and Conventional Modulation, and Hysteresis Control of the Dual Boost Nine-Level Inverter." Electronics 10, no. 2 (January 18, 2021): 207. http://dx.doi.org/10.3390/electronics10020207.

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In this article, various modulation strategies and hysteresis-band control of a recently introduced dual-boost nine-level inverter (DB9LI) are implemented. DB9LI is a switched capacitor based inverter capable of generating symmetrical nine output voltage levels by employing a single DC source. The topology generates a boosted bipolar voltage at the output side without applying end-side H-bridge (usually employed to generate negative levels), which contrasts with some of the switched-capacitor topologies. The capacitors employed have an inherent self-balancing feature. Additionally, due to lower individual and total standing voltages, switches of low voltage ratings are required. As a result, the cost of switches and the inverter reduces considerably. Metaheuristic-based selective harmonic elimination and mitigation (SHE and SHM) and various sine-triangular pulse width modulation techniques are implemented and compared on various parameters. Finally, a robust eight-band hysteresis control is designed and implemented, which helps to obtain sinusoidal load current with a unity power factor. The modulation strategies and the hysteresis control are validated on the MATLAB simulation environment and an experimental prototype.

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Wan, Ji Bo, Li Xia Zhang, Zhi Yuan Wei, and Wei Kang. "Comparing and Simulation of APF Control Strategies with Time Varying Inductive Load." Applied Mechanics and Materials 662 (October 2014): 187–90. http://dx.doi.org/10.4028/www.scientific.net/amm.662.187.

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According to the harmonic with phase controlled rectifying technology producing applied oil deposit, this paper adopts APF (active power filter) to filter out the harmonic. The current hysteresis, triangular wave and SVPWM-three kinds of control strategies are discussed. The filter effecting of three strategies are sketched. Aiming at the drawback, it show that the strategy and method with APF based on switched linear theory. The simulation results show that the filtering effect of switched linear theory is better where harmonic is serious; the trigger angle and harmonic is small, and there is no obvious difference compared with other three strategies. Therefore Linear switches suitable for harmonic suppression, When the impedance change big and triggering angle of rectifier equipment change small.

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Deng, Kai, Jia Ming Wang, Chen Yu Zhang, Jun Mei, and Jian Yong Zheng. "Control of Grid-Connected Quasi-Z Source Inverter Based on Three-States Constant Frequency Hysteresis Current Control." Applied Mechanics and Materials 687-691 (November 2014): 3266–69. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3266.

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This paper proposes a hysteresis current control method for the grid-connected quasi Z source inverter with three states and constant frequency. The hysteresis band of the inverter is analyzed in detail, and the shoot-through is inserted into the zero state without affecting the grid-connected control. Moreover, the operating states of the switches are discussed. Finally, the feasibility of the proposed topology is verified by simulations and experiments results.

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Tellapati, Anuradha Devi, and Malligunta Kiran Kumar. "A simplified hysteresis current control for cascaded converter fed switched reluctance motor." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 6 (December 1, 2019): 5095. http://dx.doi.org/10.11591/ijece.v9i6.pp5095-5106.

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Simple constructional features with no windings on rotor circuit and robustness make switched reluctance motor (SRM) a most used motors in industrial applications. Peak motor voltage rating depends on the rated voltage of the power switches. In conventional asymmetrical converter driving SRM, voltage rating of the motor depends on rating of power electronic switches in converter. Demand to rise the motor rating insists to put pressure on converter switching components which results in increased switching losses. A cascaded converter topology for SRM reduces the rating of switching components as compared to conventional converters for SRM. This paper presents a cascaded converter fed SRM drive with reduced switching losses. The paper presents a simplified hysteresis current control (HCC) for cascaded converter fed SRM. Simplified HCC control method reduces switching losses as HCC is applied to only one bridge of cascaded converter. Though the performance of the SRM remains same with cascaded converter fed SRM with HCC applied to only one bridge or to two bridges and with conventional asymmetrical converter, the switching losses are reduced to a great extent when HCC applied to one bridge of cascaded converter fed SRM. Performance of SRM is illustrated with conventional asymmetrical converter fed SRM and is compared to cascaded converter while HCC applied to only one bridge and applied to two bridges of cascaded converter. Proposed work is simulated using MATLAB/SIMULINK and results are presented.

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Malathi, V., Dr S. Sentamil Selvan, and Dr S. Meikandasivam. "Digital Hysteresis Control Algorithm for Switched Inductor Quasi Z-Source Inverter with Constant Switching Frequency." International Journal of Electrical and Electronics Research 10, no. 3 (September 30, 2022): 572–78. http://dx.doi.org/10.37391/ijeer.100327.

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In this paper, a digital hysteresis current limit controller is developed for Switched Inductor Quasi Z-Source Inverter (SLQZSI). Traditional methods like hysteresis current fixed limit and adjustable hysteresis current limit techniques changes the hysteresis bandwidth in accordance to modulating frequency and gradient of reference current. The operating shifting frequency of typical approaches oscillates and crosses the intended steady shifting frequency under noise. It leads to undesirable heavy interference between the phases and more power loss. In the planned digital hysteresis current limit technique, the hysteresis current limit is calculated by resolving the optimization problem. In the proposed approach the operating shifting frequency is kept same or inferior to the intended steady shifting frequency even under noise. Hence the planned digital hysteresis current limit algorithm maintains the output current steady and power loss is minimized which is not promised by the conservative techniques. To compare different control strategies in terms of nature of operating switching frequency and harmonic performance simulations are built on the MATLAB/SIMULINK

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Ma, Yu Ting, Liang Huang, and Wei Wei Shao. "New Open Loop Control Improves Linearity of Piezoelectric Actuators." Advanced Materials Research 211-212 (February 2011): 520–24. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.520.

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The piezoelectric material is subject to hysteresis and creep resulting in a nonlinear relationship between the applied voltage and the output mechanical displacement. An approach for compensation of both the hysteresis and creep characteristics of a piezoelectric stack actuator is proposed by utilizing a switched capacitor charge pump. The new charge pump transfers the same amount of charges to the piezoelectric actuator quantitatively, and the actuator will be excited to change its length with constant step. Compared with voltage driving mode, experiments show that both creep and hysteresis of the piezoelectric stack driven by the charge pump are effectively reduced. A hysteresis reduction of 86.10% at 0.01Hz and 94.36% at 5Hz is achieved. At the maximum driving voltage, a creep reduction of 77% is obtained.

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Yan, De Jian, Hong Lin Ouyang, and Zheng Lu. "Inverter of Hysteresis Current Control Basing on a New Single-Polar SPWM." Advanced Materials Research 529 (June 2012): 59–63. http://dx.doi.org/10.4028/www.scientific.net/amr.529.59.

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Hysteresis current control can control the current’s changing by changing the state of the inverter’s switches, in order to realize to tail the given current quickly for actual current. Theory and experimentation of changing ring width constant single-polar hysteresis current control of the cascade inverter are proposed. In the last, the simulation and the output waveforms are given.

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El Gadari, Ayoub, Hind El Ouardi, Youssef Ounejjar, and Kamal Al-haddad. "Hysteresis control of the new split-packed-U-cell inverter." Indonesian Journal of Electrical Engineering and Computer Science 28, no. 3 (October 7, 2022): 1345. http://dx.doi.org/10.11591/ijeecs.v28.i3.pp1345-1354.

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The authors provide a novel hysteresis control method for the SPUC inverter in this paper. The suggested system, which consist of the SPUC inverter and the balancing algorithm can offer eleven levels at output voltage using only seven switches, a closed loop is applied to maintain capacitors voltage at desired values, another hysteresis control that ensures capacitors voltage self-balancing is implemented in open loop which result in the proposed SPUC9 inverter .No voltage sensor or filtering is needed, as a consequence the inverter and installation expenses are kept to a minimum. The authors utilized MATLAB/Simulink environment to simulate the proposed converters. Simulation results prove all the concepts given in this paper. Total harmonic distortion remains reduced and depends on the hysteresis bandwidth

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Chen, Xu, and Shou Qi Wei. "Research on the Method of Variable-Frequency Hysteresis SVPWM Current Control for Three-Phase PWM Rectifier." Applied Mechanics and Materials 678 (October 2014): 392–98. http://dx.doi.org/10.4028/www.scientific.net/amm.678.392.

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Aiming at the shortcomings of the method of conventional hysteresis current control for three-phase PWM rectifier, this paper proposes a new method, which combines Variable-frequency hysteresis current control with Space Vector Pulse-width Modulation (SVPWM) strategy. With this method, the error current can be limited in a given hysteresis loop by switching the space voltage vector of the voltage source PWM rectifier (VSR) in real time. And it can get a faster response for the current, while the frequency of the switches can be reduced. So, this method can obtain a high quality for the current control of PWM rectifier.

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F. Nashed, Maged N. "Hysteresis Current Control of Switched Reluctance Motor in Aircraft Applications." IOSR Journal of Engineering 4, no. 3 (March 2014): 25–40. http://dx.doi.org/10.9790/3021-04352540.

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Othman, Muhammad Murtadha, Nik Muhamad Lokman Fahmi Nek Rakami, Zulkiffli Abdul Hamid, Ismail Musirin, and Mohammad Lutfi Othman. "Energy efficiency enhancement using dynamic voltage restorer (DVR)." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 3 (September 1, 2019): 1308. http://dx.doi.org/10.11591/ijpeds.v10.i3.pp1308-1316.

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Dynamic voltage restorer (DVR) is a device that can compensate harmonic, voltage sag and voltage swell condition that exists in a three-phase system. Other than that, DVR can also be used to enhance the energy efficiency or energy saving by reducing excessive amount of incoming power via the reduction incoming voltage at allowable limit. The DVR can inject the required voltage in the system so that the interruption of supply voltage can be compensated. The compensation of voltage supply interruption is improved based on the hysteresis voltage output of controller used in the DVR to detect the difference between reference voltage and disrupted voltage. The hysteresis voltage control mainly controlled by relays switching so that the signal can be sent to IGBT switches controller. The hysteresis voltage control and unipolar SPWM is supplied to control the IGBT switches by the DC supply for voltage interruption compensation. The unipolar SPWM technique converts the DC supply voltage into AC supplied voltage, thus making the DVR injection become easier to inject the AC voltage into the system to compensate voltage sag and voltage swell.

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Journal articles on the topic 'Switch hysteresis control'

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