The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Hybrid energy systems (HES), which utilize different renewable resources such as wind, solar, biomass, small/micro hydro, with fossil fuel powered diesel/petrol generator to provide electric power, are well suited for remote rural areas. This paper presents a general methodological framework for the formulation of an action plan for the small-scale hybrid energy system for remote area. The action...
During locomotion, one of various important tasks, a biped robot has to perform is the identification of 3D environment. The present work addresses the problem of offline 3D reconstruction of the environment using a stereo-vision system. The developed stereo-vision system works based on the concept of an epipolar geometry. The mathematical model that interpolates 3D position of a point with the help...
The VME64x standard defines a double edge source synchronous block transfer (2eSST) capable to sustain a data transfer rate up to 320 MByte/s on the VMEbus. This level of performance is achieved by double edge clocking a 64-bit bus with bursts of data strobe pulses. The switching activity of such a wide bus on a shared backplane challenges the signal integrity and the data transfer reliability. The...
Short term load forecasting is very essential to the operation of electricity companies. It enhances the energy-efficient and reliable operation of power system. Artificial neural networks are employed for nonlinear short term load forecasting owing to their powerful nonlinear mapping capabilities. These are generally trained through back-propagation, genetic algorithm (GA), particle swarm optimization...
The relative positions of the bus voltage phasors in the voltage space of a system depend on the characteristics of and the power flow in, the transmission network. When the voltage space of the system is examined with respect to the "centroid" of the system voltage space, it is possible to identify the loadability of buses and rank them accordingly. A technique based on concepts applied...
Online monitoring of partial discharges (PD) can reduce the risk of catastrophic failure of power apparatus. Acoustic emission technique is advantageous for online PD measurement. PDs are classified according to the origin of discharges and their effects on insulation deterioration are also different. Acoustic emission (AE) signal produced by PD are detected by sensors mounted on the experimental...
A method of moment based analysis of the feed network of a waveguide fed two dimensional array antennas has been presented using Multi Cavity Modeling Technique (MCMT). The proposed power divider/combiner is unlikely to the structure of the family of Tees. The output ports are in the same planes as the input which is an advantage for phased array applications. The proposed longitudinal power divider/combiner...
When data objects that are the subject of analysis using machine learning techniques are described by a large number of feature (i.e. the data is high dimension) it is often beneficial to reduce the dimension of the data. dimensionality reduction (DR) can be beneficial not only reasons of computational efficiency but also because it can improve the accuracy of the analysis. Now we have tried to introduce...
This paper presents the direct model reference adaptive internal model controller for doubly fed induction generator used in wind farms based on MIT rule adjustment mechanism in addition to Perrin equation adjustment mechanisms with improved internal model controller filter design. Direct model reference adaptive internal model controller is developed and it is tuned using MIT rule adjustment mechanism...
Control of most of the industrial loads is mainly based on semiconductor devices, which causes such loads to be more sensitive against power system disturbances. Thus, the power quality problems have gained more interest recently. Voltage sags are mainly caused due to starting of large induction motors, switching of large inductive loads, short circuit faults in transmission and distribution systems...
The main objective of this work is to develop a cost effective off-line method for determination of induction motor equivalent circuit parameters by conducting a single load test on the motor. The proposed scheme is an alternative viable method to conventional means of no-load and blocked rotor tests. The identification of motor parameters is redrafted as a multi-objective optimization problem and...
Magnetic resonance imagery and computed tomography (MRI/CT) scan is realized as a powerful technology for mapping soft tissue sections for diagnosis of internal human body parts since decades. These `maps' give different biomedical and anatomical information for early diagnosis of any disease. In the current work MRI scan data is utilized for building up of computer aided design (CAD) model for amputee's...
This paper deals with the analysis of pollution severity of power transmission line porcelain insulators under wet conditions using leakage current (LC) and phase angle measurement. In this work, laboratory based experiments were carried out on single disc porcelain insulator under AC voltages at different pollution conditions with sodium chloride as a contaminant. Leakage current and voltage waveform...
A novel proposal is made in this paper towards minimization of starting torque pulsations of ac voltage controller fed induction motor drive. An optimization model of the problem is presented and optimum SCR firing angle is identified through genetic algorithm (GA). Computed results on two different induction motors show the effectiveness of the proposed algorithm.
In electric power system the estimation of different waveforms are important in many cases. Transformer impulse fault current estimation helps to identify the type and detect the exact location of fault in winding. The estimation of short circuit currents is necessary while sizing and selecting the equipments and protective devices. In this proposed work, an attempt has been made for estimation of...
A new recursive algorithm is presented for estimating state variables of observable linear time-invariant continuous-time dynamical systems from the system input-output information using shifted Legendre polynomials (SLP). The principle of Luenberger observer is utilized for estimating the state variables. The proposed approach has the distinct advantage that the smoothing effect of integration reduces...
Pulse width modulation (PWM) switching technique is commonly used in full bridge converters to overcome the bulky filter requirements and efficient voltage control, at the cost of higher switching losses. However, all PWM techniques not only cause circuit complexity but also need high frequency switches such as MOSFETs with high conduction drop causing lower efficiency. This paper presents a novel...
Categorical data clustering has been gaining significant attention from researchers, because most of the real life data sets are categorical in nature. In contrast to numerical domain, no natural ordering can be found among the elements of a categorical domain. Hence no inherent distance measure, like the Euclidean distance, would work to compute the distance between two categorical objects. In this...
In particle accelerator environment, most of the power converters feeding magnet-loads have either thryristorized or diode bridge at their input stage. Loads to these power converters are fixed but they are operated through a wide current range. Such converters being non-linear loads to the mains produce considerable distortion in the supply current. Hereby, results in a poor total harmonic distortion...
This paper describes on how to formulate a self-balancing space vector modulator for the three-level neutral point clamp topology typically used for high power induction motor drives. Dependence of the DC link capacitor voltage deviation on DC-link current and inverter switching states is established for proposed three-level inverter. Pulse pattern rearrangements for space vector PWM (SVPWM) using...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.