Loading...
Search for:
power-electronics
0.011 seconds
Total 250 records
Comprehensive analytics for reliability evaluation of conventional isolated multiswitch PWM DC-DC converters
, Article IEEE Transactions on Power Electronics ; Volume 35, Issue 5 , 2020 , Pages 5254-5266 ; Panahandeh Esmaeelnia, F ; Fotuhi Firuzabad, M ; Tahami, F ; Tohidi, S ; Dehghanian, P ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2020
Abstract
This article offers a holistic model and approach on reliability assessment of conventional isolated multiswitch pulsewidth modulation dc-dc (IMSDC-DC) power electronic converters with conventional half-bridge, full-bridge, and push-pull dc-dc topologies. The proposed reliability assessment analytics encapsulate correlated effects of several conditions (e.g., open- and short-circuit faults) and prevailing parameters (e.g., duty cycle, input voltage, output power, transformer turns ratio, voltage gain, switching frequency, operation time duration, and components characteristics) on the overall reliability performance of IMSDC-DC converters. Such insights are then harnessed within a Markov...
A dual-frame hybrid vector control of vector-modulated VIENNA I rectifier for unity power factor operation under unbalanced mains condition
, Article 2008 23rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC, Austin, TX, 24 February 2008 through 28 February 2008 ; 24-28 Feb , 2008 , Pages 1402-1408 ; 10482334 (ISSN) ; 9781424418749 (ISBN) ; Moallem, A ; Zolghadri, M. R ; Ferdowsi, M ; Sharif University of Technology
2008
Abstract
In this paper, a dual-frame hybrid vector control (DFHVC) of vector-modulated VIENNA I rectifier is proposed. The purpose of this novel vector control system is not only to reduce second-order harmonic pulsation on the dc-side and consequently, to reduce odd-order harmonics on the ac side of VIENNA I rectifier under unbalanced mains, but also to ensure a near unity power factor operation of the rectifier under such circumstances. To serve this purpose, at first, a mathematical model of the VIENNA I rectifier under unbalanced condition is derived. In this model, besides demonstrating the nonlinear nature of the DC-link voltage dynamic, a new set of equations for current reference generation...
A passivity-based controller via parallel damping injection for three phase/level/switch unity power factor (Vienna I) rectifier
, Article 11th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2008, Zurich, 17 August 2008 through 20 August 2008 ; 2008 ; 9781424425518 (ISBN) ; Mousavian, H ; Zolghadri, M. R ; Karimi Ghartemani, M ; Sharif University of Technology
2008
Abstract
Passivity-based control (PBC) is based on a procedure including energy/power shaping and series/parallel damping injection to control several nonlinear systems such as power converters. In this paper, PBC is used to design a controller for three phase/level/switch PWM (Vienna I) rectifier. Passivity-based controller is supposed to regulate the output voltage and the input three phase sinusoidal currents to achieve unity power factor. Parallel damping injection is used for a controller design. Simulation results are presented to confirm the whole system performance and verify the analytical conclusions. It is also shown that the controller is robust to the load and (symmetrical) input...
Multi objective distributed generation planning using NSGA-II
, Article 2008 13th International Power Electronics and Motion Control Conference, EPE-PEMC 2008, Poznan, 1 September 2008 through 3 September 2008 ; 2008 , Pages 1847-1851 ; 9781424417421 (ISBN) ; Yousefi, A ; Soroudi, A ; Ehsan, M ; Sharif University of Technology
2008
Abstract
With the increasing share of distributed generation in electrical energy supply, the proper planning procedure for using these units, has become more vital for power system planners. In this paper, the application of multi-objective optimization techniques for siting, sizing and determination of the proper technology to be used, has been investigated in such a way that, the load demand during the planning horizon is met and the technical and environmental constraints are satisfied. Unlike the traditional optimization methods used in power system optimization, NSGA-II multi-objective optimization algorithm does not consider techno-economical and environmental parameters in the constraints of...
A DSP-based unified three phase/switch/level unity power factor rectifier using feedback linearization for DC-bus voltage control
, Article 7th International Conference on Power Electronics and Drive Systems, PEDS 2007, Bangkok, 27 November 2007 through 30 November 2007 ; 2007 , Pages 778-783 ; 1424406455 (ISBN); 9781424406456 (ISBN) ; Mirzaee Teshnizi, H ; Zolghadri, M. R ; Sharif University of Technology
2007
Abstract
In this paper, a unified hybrid vector control of vector modulated VIENNA I rectifier is presented. Feedback linearization technique is used for the DC-link voltage control. For this purpose, at first a mathematical model of the VIENNA I rectifier is derived. Using this model, it is shown that the dynamic of the rectifier falls into two categories; linear inner dynamic which consists of inner current control and neutral-point potential control and nonlinear outer dynamic which consists of the DC-link voltage control. Based on these facts, a hybrid vector control scheme meaning linear vector control of inner dynamics and nonlinear vector control of outer dynamic is devised. Simulations...
Robust H∞ control design for PFC rectifiers
, Article 7th International Conference on Power Electronics and Drive Systems, PEDS 2007, Bangkok, 27 November 2007 through 30 November 2007 ; 2007 , Pages 948-952 ; 1424406455 (ISBN); 9781424406456 (ISBN) ; Molla Ahmadian, H ; Moallem, A ; Sharif University of Technology
2007
Abstract
Power factor correction (PFC) converter circuits are non-linear system due to the contribution of their multiplier. This non-linearity reflects the difficulty of analysis and design. Models that reduce the system to a linear system involve considerable approximation, and produce results that are susceptible to instability problems. Our goal is to design a controller that achieves some performance specifications despite these uncertainties in modeling. This paper addresses a robust H∞ control problem for switched circuits with parameter uncertainties. The necessary and sufficient conditions for existence of strong robust H∞ dynamic compensators and static output feedback controllers are...
Gain boosted amplifier design for low power-high speed applications
, Article Conference Proceedings - 2nd Annual IEEE Northeast Workshop on Circuits and Systems, NEWCAS 2004, Montreal, Que., 20 June 2004 through 23 June 2004 ; 2004 , Pages 233-235 ; 0780383222 (ISBN) ; Foruzandeh, B ; Farbiz, F ; Fathi, E ; Sharif University of Technology
2004
Abstract
In this paper, different models of gain enhanced amplifier are compared and the most accurate one is chosen. Based on this model, complete symbolic small signal analysis is performed and a design procedure leading to high speed gain boosted amplifier is presented
Encrypted internet traffic classification using a supervised spiking neural network
, Article Neurocomputing ; Volume 503 , 2022 , Pages 272-282 ; 09252312 (ISSN) ; Delpech, F ; Aguilar Melchor, C ; Zimmer, R ; Shouraki, S. B ; Masquelier, T ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Internet traffic recognition is essential for access providers since it helps them define adapted priorities in order to enhance user experience, e.g., a high priority for an audio conference and a low priority for a file transfer. As internet traffic becomes increasingly encrypted, the main classic traffic recognition technique, payload inspection, is rendered ineffective. Hence this paper uses machine learning techniques looking only at packet size and time of arrival. For the first time, Spiking neural networks (SNNs), which are inspired by biological neurons, were used for this task for two reasons. Firstly, they can recognize time-related data packet features. Secondly, they can be...
Research on the effect of transients of high-voltage power supplies on the lifetime of high-power vacuum tubes: A microscopic assessment
, Article IEEE Transactions on Plasma Science ; Volume 50, Issue 11 , 2022 , Pages 4700-4708 ; 00933813 (ISSN) ; Ziaoddini, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
Electron guns are used as the electron sources in high-power electron tubes. The generated electron beam in electric guns passes through an aperture at the center of the anode. Since the electron beam has considerable kinetic energy, any collision between the electron beam and the anode aperture edge damages the electron gun. Therefore, electron guns are designed to meet the compatibility between the diameters of the electron beam and the anode aperture. However, this compatibility is disrupted during the transient time interval of the gun's power supply. In this article, the cause of failure of the electron gun of high-power electron tubes is investigated for the transient interval of the...
All-optical recurrent neural network with reconfigurable activation function
, Article IEEE Journal of Selected Topics in Quantum Electronics ; 2022 , Pages 1-1 ; 1077260X (ISSN) ; Koohi, S ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
Optical Neural Networks (ONNs) can be promising alternatives for conventional electrical neural networks as they offer ultra-fast data processing with low energy consumption. However, lack of suitable nonlinearity is standing in their road of achieving this goal. While this problem can be circumvented in feed-forward neural networks, the performance of the recurrent neural networks (RNNs) depends heavily on their nonlinearity. In this paper, we first propose and numerically demonstrate a novel reconfigurable optical activation function, named ROA, based on adding or subtracting the outputs of two saturable absorbers (SAs). RAO can provide both bounded and unbounded outputs by facilitating an...
Family of interleaved high step-up DC-DC converters utilizing multi-winding coupled inductors
, Article 13th Power Electronics, Drive Systems, and Technologies Conference, PEDSTC 2022, 1 February 2022 through 3 February 2022 ; 2022 , Pages 555-560 ; 9781665420433 (ISBN) ; Tarzamni, H ; Sabahi, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
This paper proposes a family of interleaved DC-DC converters for high step-up applications based on multi-winding coupled inductors, which utilize inductive and capacitive approaches to transfer the input energy to the output load. The wide output load voltage level of the proposed converter depends on the switches duty cycle and the coupled inductor (CI) turns ratio. As some features, interleaving and cascading help the converters achieve high output voltage gain, low input current ripple, low-volume input inductor, and high reliability. Moreover, employing multi-winding coupled inductors improves output voltage gain, recycles the magnetic components stored energy, cancels circulating...
Design & Implementation of high dynamic range current measurement system for Iot applications
, Article IEEE Transactions on Instrumentation and Measurement ; Volume 71 , 2022 ; 00189456 (ISSN) ; Atarodi, S. M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
Internet-of-Things (IoT) devices have a strict necessity for power consumption to achieve the expected battery life. Therefore, measuring and optimizing the energy consumption of IoT nodes are essential. IoT nodes feature extreme current consumption range over 100 dB between their operating modes. The main focus of this article is to design and implement a low-power and low-cost current measurement circuit, which can be integrated into IoT nodes. A new pass element is introduced for measuring the current consumption. This element is placed in the current path to measure current over a high dynamic range with a constant voltage drop. The introduced pass element consists of a capacitor and...
ARMOR: A reliable and mobility-aware RPL for mobile internet of things infrastructures
, Article IEEE Internet of Things Journal ; Volume 9, Issue 2 , 2022 , Pages 1503-1516 ; 23274662 (ISSN) ; Safaei, B ; Monazzah, A. M. H ; Bauer, L ; Henkel, J ; Ejlali, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
Mobile portable embedded devices are becoming an integral part of our daily activities in the vision of Internet of Things (IoT). Nevertheless, due to lack of mobility support in the IPv6 routing protocol for low-power and lossy networks (RPLs), which is standardized for multihop IoT infrastructures, providing reliable communications in terms of packet delivery ratio (PDR) in mobile IoT applications has become significantly challenging. While several studies tried to enhance the adaptability of RPL to network dynamics, their utilized routing metrics have prevented them from establishing long-lasting reliable paths. Furthermore, the stochastic parent replacement policy in the standard version...
Probabilistic worth assessment of distributed static series compensators
, Article IEEE Transactions on Power Delivery ; Vol. 26, issue. 3 , 2011 , p. 1734-1743 ; ISSN: 08858977 ; Fotuhi-Firuzabad, M ; Aminifar, F ; Sharif University of Technology
Abstract
The deployment of flexible ac transmission system (FACTS) devices, despite miscellaneous benefits and applications, has been restricted mainly due to their large investment costs. Accordingly, the notion of distributed FACTS (D-FACTS) was recently proposed. Distributed static series compensators (DSSCs), as a new member of D-FACTS, are directly clamped to conductors of transmission lines. The possibility of controlling the compensation rate of DSSCs from the control center affords the active control of network power flow. This paper presents a comprehensive reliability model for the DSSC. The model is then reduced and a state-space representation is extracted for a transmission line with a...
UPFC for enhancing power system reliability
, Article IEEE Transactions on Power Delivery ; Vol. 25, issue. 4 , 2010 , p. 2881-2890 ; ISSN: 8858977 ; Fotuhi-Firuzabad, M ; Shahidehpour, M ; Feuillet, R ; Sharif University of Technology
Abstract
This paper discusses various aspects of unified power flow controller (UPFC) control modes and settings and evaluates their impacts on the power system reliability. UPFC is the most versatile flexible ac transmission system device ever applied to improve the power system operation and delivery. It can control various power system parameters, such as bus voltages and line flows. The impact of UPFC control modes and settings on the power system reliability has not been addressed sufficiently yet. A power injection model is used to represent UPFC and a comprehensive method is proposed to select the optimal UPFC control mode and settings. The proposed method applies the results of a contingency...
Optimal tuning of linear controllers for power electronics/power systems applications
, Article Electric Power Systems Research ; Volume 81, Issue 12 , 2011 , Pages 2188-2197 ; 03787796 (ISSN) ; Edrington, C. S ; Mokhtari, H ; Sharif University of Technology
2011
Abstract
This paper presents a new method for tuning various linear controllers such as Proportional-Integral (PI), Proportional-Integral-Derivative (PID) and Proportional-Resonant (PR) structures which are frequently used in power electronics and power system applications. The linear controllers maintain a general structure defined by the Internal Model Principle (IMP) of control theory. The proposed method in this paper is twofold. The first perspective uses the well-known concept of the Linear Quadratic Regulator (LQR) to address the problem as a regulation problem. The Q matrix of the LQR design is then finely adjusted in order to assure the desired transient response for the system. The second...
Probabilistic worth assessment of distributed static series compensators
, Article IEEE Transactions on Power Delivery ; Volume 26, Issue 3 , July , 2011 , Pages 1734-1743 ; 08858977 (ISSN) ; Fotuhi Firuzabad, M ; Aminifar, F ; Sharif University of Technology
2011
Abstract
The deployment of flexible ac transmission system (FACTS) devices, despite miscellaneous benefits and applications, has been restricted mainly due to their large investment costs. Accordingly, the notion of distributed FACTS (D-FACTS) was recently proposed. Distributed static series compensators (DSSCs), as a new member of D-FACTS, are directly clamped to conductors of transmission lines. The possibility of controlling the compensation rate of DSSCs from the control center affords the active control of network power flow. This paper presents a comprehensive reliability model for the DSSC. The model is then reduced and a state-space representation is extracted for a transmission line with a...
Small-signal modeling and fast response control strategy for DCVM Cúk converters in PFC applications.انجام شد
, Article Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC ; 2011 , Pages 1795-1802 ; 9781424480845 (ISBN) ; Karimi, Y ; Zolghadri, M. R ; Ahmadian, M ; Moayedi, A ; Davoudi, A ; Sharif University of Technology
Abstract
Cúk Converter operating in discontinuous capacitor voltage mode is an inherent PFC converter in which, unity power factor can be achieved using constant duty cycle and switching frequency. In this paper, a reduced-order switch network modeling technique is applied to Cúk converter operating in DCVM in order to derive small-signal model of the converter assuming a dc voltage source as the input source of the converter. This model is extended to derive the small-signal behavior of the converter while operating as a PFC converter. The validity of the proposed model is confirmed by both simulation and experimental results. Afterwards, a new control strategy is proposed in which switching...
UPFC for enhancing power system reliability
, Article IEEE Transactions on Power Delivery ; Volume 25, Issue 4 , 2010 , Pages 2881-2890 ; 08858977 (ISSN) ; Fotuhi Firuzabad, M ; Shahidehpour, M ; Feuillet, R ; Sharif University of Technology
2010
Abstract
This paper discusses various aspects of unified power flow controller (UPFC) control modes and settings and evaluates their impacts on the power system reliability. UPFC is the most versatile flexible ac transmission system device ever applied to improve the power system operation and delivery. It can control various power system parameters, such as bus voltages and line flows. The impact of UPFC control modes and settings on the power system reliability has not been addressed sufficiently yet. A power injection model is used to represent UPFC and a comprehensive method is proposed to select the optimal UPFC control mode and settings. The proposed method applies the results of a contingency...
CNTFET full-adders for energy-efficient arithmetic applications
, Article 6th International Conference on Computing, Communications and Networking Technologies, 13 July 2015 through 15 July 2015 ; 2015 ; 9781479979844 (ISBN) ; Hashemi, M ; Haghshenas, K ; Rezaee, S ; Rapolu, S ; Nikoubin, T ; University of North Texas ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
Abstract
In this paper, we present two energy-efficient full adders (FAs) which are a crucial building block of nano arithmetic logic units (nano-ALUs) with the Cell Design Methodology (CDM). Since the most suitable design configuration for CNT-based ICs is pass transistor configuration (PTL), CDM which properly benefits from PTL advantages is utilized. So the designs herewith take full advantages of simplicity, fewer transistors and better immunity against threshold voltage fluctuations of the PTL than the CCMOS configuration. CDM also resolves two problems of PTL by employing elegant mechanisms which are threshold voltage drop and loss of gain. Using the amend mechanisms and SEA sizing algorithm...