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.
This paper describes modeling of on-chip Inductors and transformers for high frequency integrated circuit applications. The effects of the substrate losses, substrate capacitances, overlap capacitances between the turns of spiral and the cross-under layer, and the oxide capacitance between the spiral and the substrate are included in the analysis. This model will facilitate on-chip inductor and transformer...
This paper presents a robust state feedback controller for a linear induction motor drive without a seed sensor. This is accomplished via employing the linear quadratic Gaussian approach. The standard Kalman filter technique has been employed to estimate the full states of the system including the motor speed. The primary current components are only the measured signals. The computational burden could...
This paper presents the analysis, design and simulation or wind-powered self-excited induction generator (SEIG). The three-phase SEIG is driven by a variable-speed prime mover (VSPM) such as a wind turbine for the clean alternative renewable energy in rural areas. The VSPM is modeled by as a variable-speed separately-excited DC motor to simulate to the wind turbine. Also, the paper describes the dynamic...
This paper is dealt with one of vital important subjects to the designer and the operator of Distribution systems (DS). Its reliability has been estimated under several conditions of relay and transformers types and DS configurations. The results obtained enable the designer to determine the choice of these factors in view of the sensitivity of DS reliability to their failure characteristics. A computer...
The modeling and simulation of a 1kW vertical-axis direct drive topology wind turbine are implemented. An axial flux permanent magnet synchronous generator with multi-pole is directly connected to the wind turbine shaft. The wind turbine system is controlled to operate at constant tip-speed ratio and hence maximizing the power extracted from the wind. For battery charging applications, a modified...
This paper proposes the use of an existing Voltage Source Converter (VSC) HVDC back-to-back tie for enhancing the damping in the power system through a supplementary Controller. In this context, investigations have been conducted on a large generator unit connected to a HVAC/DC system. The results of these investigations are presented in the form of typical time responses.
Modern power systems have been large and more complex for interconnections of the countries or electric companies. The simulation of the large power systems for the stability analysis is not necessary to model in detail the entire system. It often requires the use of equivalent representation of circuits and generators. The method of constructing to obtain a dynamic equivalent for a large power system...
Major technical issues related to increased reliance on distributed generation systems (DGS). In distribution systems including lack of: appropriate dynamic models reliable control approaches, efficient dispatch methods, and control strategies to facilitate the connection of distributed generation resources to distribution networks. Among available types of DGS, fuel cells show particular promise...
The following topics are dealt with: control of electrical machines; power electronics; power system protection; wind energy systems; control of power systems; high voltage engineering; power quality; power systems engineering; photovoltaic energy systems; renewable energy systems; electrical power load management; and electrical machines.
Maximum power point tracking (MPPT) is necessary for photovoltaic (PV) systems to collect the maximum photovoltaic array power under variations in the insolation and temperature. This paper presents an artificial neural controller for maximum power point tracking of photovoltaic system based on back- propagation algorithm. The tracking algorithm changes the duty cycle of the DC-DC converter so that...
αβ-Transformation is a de transformation used to transfer the three-phase ac system of voltage or current to a dc system. This paper presents the application of this transformation to identifying the power quality events, such as harmonics, voltage sages, flicker, swell and transients. The proposed transformation can be implemented for a single phase or three- phase system of voltage. The phasor voltage...
The paper presents an algorithm for generating capacity adequacy study for the reliability test system IEEE RTS. based on Monte Carlo simulation-state sampling technique. The Monte Carlo simulation procedure treats the problem as a series of ??real?? experiments, whose outcomes depend on the operating characteristics of the components and of the system. The reliability indices are then estimated by...
Extremely Low Frequency Electromagnetic Fields (ELF) due to low and medium voltages are normally low. But with the wide spread and increase in the use of electrical energy, the potential for exposure has increased considerably. Exposure to man made electrical appliances generally ranges from 15 V/m up to 100 V/m for electric fields and from 0.1 ??T to more than 30 ??T for magnetic field. Our main...
In this paper a design procedure of sliding mode control for uncertain dynamical system is presented. The switching hyperplane is simply designed by using system transformations. The control law is designed such that the reaching condition is guaranteed. Application to permanent magnet direct current (PMDC) motor speed control is studied. The present of load torque and parameter variations are considered...
This paper presents in this study a control algorithm to compensate harmonic current and reactive power simultaneously in 3 phase, where 3-wire and 4-wire non-linear loads. If the utility voltage is distorted, active power filter (APF) allows similar level of distortion in the compensated source current. Therefore, the resultant source currents have the same waveform as that of the supply voltage,...
In this paper a new formulation of the general capacitor placement problem is introduced. Practical aspects of capacitors, load constraints and operational constraints at different load levels are considered. This study considers the realistic nature of load variation of the feeder. The problem is solved using a powerful simulated annealing approach presented in this paper. The availability of simulated...
The 4/2 pole, 2-phase configuration of switched reluctance motors is characterized by its simple motor construction and simple power electronic circuit topology. This motor is known with different air gap geometries to enhance its starting performance. This paper investigates the operating performance of this motor type with four different rotor designs having different air gap geometries. A numerical...
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.