Tooraj Abbasian Najafabadi's research while affiliated with University of Tehran and other places
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Publications (30)
Distributed generation is an effective solution to clean, reliable, and cost-efficient energy supply. In this framework, inverters play a key role as energy converters. Accordingly, this paper investigates the utilization of nonlinear inductive-capacitive (LC) filters for grid-connected inverters. Nonlinear LC filters are made of inductors with non...
Stress control of boilers is a major concern in the aged power plants. The studied forced circulation boiler suffers from a malfunction of the combustion control system. In order to reduce cyclic stress on boiler equipment and prevent undesirable shutdowns of power unit during fuel shortage events, an operating instruction is proposed. In order to...
A four-switch inverter called the B4 inverter is a reconfigured topology of a B6 inverter, one leg of which is damaged. The four-switch topology provides the overall system with fault-tolerant characteristics. However, this reconfiguration will not only change the system dynamics but also degrade the system performance. For overcoming with these is...
This paper presents a hierarchical smart home control system, which controls the residential appliances. In this system, there are a supervisory controller, a secondary controller and some smart plugs. The supervisory controller is the power utility, which produces the instantaneous or multi-time electricity tariffs and the appropriate load sheddin...
Recommendation from my B.Sc. and M.Sc. supervisor
یکی از راه های مناسب برای صرفه جویی در مصرف انرژی الکتریکی، کنترل بارهای الکتریکی، در بخش های مختلف صنعتی، اداری یا خانگی است. با پیاده کردن الگوریتم های کنترلی مناسب می توان ضمن کاهش مصرف انرژی و بهبود شاخص های فنی، رضایت مصرف کننده را نیز از چگونگی استفاده از انرژی حفظ کرد. در بخش مدیریت توزیع با تعیین تعرفه‌ی مناسب در طول روز، با اعمال قیمت بازا...
اين دستگاه كنتور هوشمند برق است كه ولتاژ و جريان ورودي و خروجي خود و همچنين توان اكتيو و راكتيو مصرفي خانوار را اندازه گيري مي كند. هم چنين قادر است با استفاده از منطق فازي ولتاژ خروجي خود را در مقدار مطلوبي ثابت نگه دارد كه علاوه بر جلوگيري از آسيب رسيدن به دستگاه ها باعث كاهش توان مصرفي و در نتيجه كاهش هزينه ي خانوار گردد.
Conventionally, Selective Harmonic Elimination (SHE) method in 2-level inverters, finds best switching angles to reach first voltage harmonic to reference level and eliminate other harmonics, simultaneously. Considering Induction Motor (IM) as the inverter load, and wide DC bus voltage variations, the inverter must operate in both over-modulation a...
This paper presents a novel smart street lighting (SmSL) system in which energy consumption by a group of street lighting poles is minimized based on Brute-Force search algorithm. While outdoor lighting imposes considerable cost, maintenance, safety, and environmental issues; utilization of advanced street lighting system with energy saving, autono...
Acute myelogenous leukemia (AML) is a subtype of acute leukemia, which is characterized by the accumulation of myeloid blasts in the bone marrow. Careful microscopic examination of stained blood smear or bone marrow aspirate is still the most significant diagnostic methodology for initial AML screening and considered as the first step toward diagno...
In grid-connected inverters, utilisation of an appropriate output filter is vital to improve power quality. However, the filter, which comprises of capacitor and inductor(s), should be cost effective. In this study, an LCL filter with non-linear inverter-side inductor is used to reduce the filter volume and cost. In order to harness the undesirable...
در سیستم‌های تولید پراکنده‌ی متصل به شبکه، جریان دائم تولیدشده توسط منابع تولید توان پراکنده، توسط یک پردازشگر توان به جریان متناوب قابل تزریق به شبکه تبدیل می‌شود. عملکرد مطلوب این سیستم‌ها مستقیماً وابسته به عملکرد سیستم کنترلی است. اخیراً کنترل‌کننده‌های تناسبی-رزونانسی باقابلیت ردیابی سیگنال سینوسی و حذف اغتشاشات گزینه‌ای مناسب برای اینورترهای...
In this research the possibility of nondestructively prediction of two main quality parameters of poultry egg using Principle Component Analysis (PCA) and Radial Basis Function (RBF) network by transmission Vis-NIR spectroscopy method was investigated. The studied parameters include Haugh Unit and air cell height as a function of a 5-week storage d...
In this paper, a novel calibration procedure for skew redundant inertial measurement units (SRIMUs) based on micro-electro mechanical systems (MEMS) is proposed. A general model of the SRIMU measurements is derived which contains the effects of bias, scale factor error and misalignments. For more accuracy, the effect of lever arms of the accelerome...
Over the last few years, load growth, environmental issues and the increasing importance of declining energy costs have brought about a vast change in the focus of more and efficient use of renewable energy resources. In grid-connected renewable energy sources (RESs), the DC current of RES is injected to the grid by power processing interfaces afte...
In this paper, an H∞ method based controller is designed to achieve high performance in extreme wind speed profile and tolerate possible actuator faults. This controller uses generator and rotor speed measurements and blade pitch actuator as control input. Moreover, a sliding mode fault detection and isolation (FDI) system is applied to reconstruct...
Prediction error minimization (PEM) method is used for modeling microelectromechanical (MEMS) system-based inertial sensor stochastic errors instead of autoregressive (AR) processes that are implemented in most of the recent studies. Since the sensor outputs are buried in a high-power white noise, the linear prediction methods used in the AR approa...
Sensorless and sensor-fault-resilient control of a networked dc motor system (NDCMS) with an optimal integral-square-error proportional-integral (PI) controller is considered, while network-induced delays and packet dropouts are taken into account. A sliding-mode observer is developed to estimate rotor speed and unknown load torque for the networke...
An adaptive observer with online estimation of rotor and stator resistances is considered for induction motors, while only one phase current is measured. Generally, an induction motor drive controller needs at least two phase-current sensors. Nevertheless, failure of one current sensor results in degradation of motor drive performance and reliabili...
A sensor fault detection and isolation unit is considered for induction-motor drives based on an adaptive observer with rotor-resistance estimation. Generally, closed-loop induction-motor drives with voltage-source inverters use a speed or position, a dc-link voltage, and two or three phase-current sensors. In the proposed fault-detection and isola...
An adaptive observer is proposed for concurrent estimation of rotor fluxes, unknown dc-link voltage, and rotor resistance of induction motor with voltage source inverters. For the reported flux observers and parameter estimators, the implied assumption had been that the input voltages were measured by sensors, or presumed to be known, for example w...
Induction motor direct starting may cause faults on both the power net and mechanical load. In other words the first current peak and the first torque peak of induction motors are vital for the power net and mechanical load respectively. A model for induction motors is proposed in [1] considering saturation effects. Although this model attempts to...
In this paper, a sensorless induction motor drive based on the adaptive feedback linearization control is presented, while core loss and rotor resistances are estimated. A nonlinear observer is developed to estimate the dq fluxes and rotor speed, in addition to rotor and core loss resistances. Adaptive feedback linearization control is used to trac...
Citations
... As aforementioned, the inverter is interconnected to the grid, so it should fulfill the grid standards as well. These standards includes power quality, grid ride through capability and islanding prevention [44]. Power quality is mainly measured on the basis of Power Factor (PF) and Total Harmonic Distortion (THD). ...
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... Cyclical work caused by cooling and heating processes can cause the phenomenon of low-cycle fatigue and even lead to fatigue damage [1]. An old forced circulation dual-fuel subcritical power boiler was analyzed to reduce cyclic stress [2]. Thermal stresses in the tube walls were calculated based on the assumption of the linear temperature distribution in the tubes. ...
... Du et al. [30] developed a new model on the basis of the HiLoMoT for rapid calibration test of diesel engines. Razavi et al. [31] employed the LoLiMoT in an updatable prognosis methodology. Oliaee et al. [32] proposed an incremental algorithm by combining the genetic and LoLiMoT methods for nonlinear fault detection and identification in industrial gas turbines. ...
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... Using SVM and critical features, the classification and regression models for RUL are built and can predict multiple batteries accurately [13]. Razavi et al. proposed an adaptive NFIS to predict the RUL of aircraft engines by studying the degradation process of the engine with only the provided historical data [14]. Reliability functions such as Weibull distribution have been used to construct a Weibull accelerated failure time regression (WAFTR) model by Kundu et al. [15]. ...
... Parsa et al. [17] designed a hierarchical framework to control home appliances. A decision-driven supervisory controller, as defined in the network, to identify and handle the load shedding. ...
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... Data collected from individual smart appliances can be used to improve energy efficiency in an SC [13]. A smart home device will optimize energy usage and cut costs, while keeping customers happy [14], resulting in smarter cities with lower energy consumption. The IoT is intended to promote the concept of SCs, with the aim of making city governance and the lives of residents easier by using the most advanced connectivity technologies [15]. ...
... Induction Motor Harmonics (IMH) stem from the three-phase current and from the rotating magnetic field, typical of induction machines. In these frameworks, the fluctuating part of the supplied torque only includes the Induction Motor Harmonics, 6k × f stator [38,39], where f stator is the rotational frequency of the magnetic field. The synchronous speed, n s , is given by n s = 60 f stator . ...
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... Mahoor et al. [105], employed a brute force algorithm for optimizing a cost function, with group arrangement and dimming level as primary inputs. The goal was to identify the best group of SLs to activate and determine an energy-efficient dimming level, considering local traffic data and ambient luminance. ...
... All methods above use datasets from gene expression profiling (GEP) to diagnose AML. Another approach on different type of data like histopathology slides, using machine techniques has a been tried out but the performance of the corresponding model, as regards accuracy, is around 95% [15]. ...
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... Therefore, in order to reduce the low-order harmonics in the current caused by the inductance variation, a proportional-integral (PI) control method based on the combination of a linear and non-linear controller is proposed in [6]. Moreover, a new control strategy based on a proportional resonant (PR) regulator is given in [7]. By using the online adaptive estimation of a non-linear filter inductor, the harmonic compensators' gains of the PR regulator can be reduced, and the acceptable total harmonic distortion (<5%) is achieved. ...
