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.
A new integrated mathematical model for the simulation of offshore wind energy conversion system performance is presented in this paper. The mathematical model considers an offshore variable-speed turbine in deep water equipped with a permanent magnet synchronous generator using full-power two-level converter, converting the energy of a variable frequency source in injected energy into the electric...
This paper introduces the harmonic sources and transmission modes of the wind farms with doubly-fed introduction generators; Based on the PSCAD/EMTDC simulation software, total harmonic distortion of voltage(THDU) and individual harmonic ratio of current(HRI) of a single wind turbine operated in different transmission modes can be got respectively. Then THDU and HRI of the wind farm are calculated...
A method for estimating induction motor's rotor speed is proposed in this paper. The proposed rotor speed estimation method is based on model reference adaptive identification theory. By applying the proposed rotor speed estimation method, the induction motor control system can simultaneously estimate the stator resistance and the rotor speed of the induction motor. The proposed speed sensorless control...
Opportunities of building a kinetic energy storage based on an asynchronized hydrogenerator without a flywheel with a dual frequency converter in a rotor circuit have been discussed. Control algorithms have been proposed. The storage and other devices have been simulated by a methodology of computing systems by interconnected subsystems, which enabled minimization of machine time consumption for computations...
We continue to consider the question of what language features are needed to effectively model cyber-physical systems (CPS). In previous work, we proposed using a core language as a way to study this question, and showed how several basic aspects of CPS can be modeled clearly in a language with a small set of constructs. This paper reports on the result of our analysis of two, more complex, case studies...
This paper studies a speed sensorless permanent magnet synchronous motor (PMSM) drive system based on the adaptive observer method, analyzes the problem of instability in the low-speed electric mode according to the observer linearization method. To solve this problem, the observer augmented with a signal injection technique is researched. The simulation results show that the method is effective to...
Directional Steering Systems (DSS) have been developed in the oil and gas industry to achieve high well production when compared to conventional drilling systems. In this paper a dynamic modeling of a DSS using four DC motors was developed. A controller was designed using Feedback Linearization technique for the cancellation of non-linear dynamics and LQR for the optimal linear control. Simulation...
In this paper, a Particle Swarm Optimization based PI controller (PSO-PI) is used for control the speed and the torque of a Permanent Magnet Synchronous Motor (PMSM) while a Model Reference Adaptive System (MRAS) based on an Artificial Neural Network (ANN) estimation mechanism is applied to estimate sensorless the speed. In order to show the capability of the proposed PSO-PI controller, it is compared...
In this paper, an attempt has been made to predict the performance of grid connected induction generator (GCIG) due to different nature of grid faults. MATLAB/Simulink model for the power network as developed along with three phase induction machine model is used to observe the effects of faults on the transient performance of SCIG. Simulation result as obtained are found to be useful to predict the...
This paper present an approach to solve the optimal energy consumption problem in an induction motor (IM) in transient regime. The proposed approach employs particle swarm optimization (PSO) algorithm for optimal setting of the problem variables. The PSO-based approach uses the information about the speed and determines the minimum-energy rotor flux parameters. The simulation results are presented...
The aim of this paper is to propose an optimum linear control algorithm that is able to stabilize the attitude of a hexarotor micro aerial vehicle (MAV) in indoor environment. The work will then compare it with the classical control PID (proportional-integral-derivative) and optimal control LQR (linear quadratic regulator) techniques. The proposed attitude controller is based on an outer-inner loop...
The present investigation is aimed at exploring the feasibility of using vertical axis turbine which, otherwise, is ideally suited for wind energy conversion system (WECS), for hydropower generation. River water currents are potentially significant and reliable source of power generation and currently no significant work has been carried out to tap this source of energy. Electrical energy can be efficiently...
Efficient damping control devices installed in a power system play a vital role in transient stability improvement. This paper presents a comprehensive approach to design and compare the direct and indirect NeuroFuzzy wavelet control schemes for supplementary control of Static Synchronous Series Compensator (SSSC) to damp power system oscillations. Machine rotor speed deviation and its derivative...
This paper is the article which researches the control algorithm applied to servo system of antenna sub-reflector, the main control algorithm is fuzzy sliding mode control algorithm. This paper first introduces the idea of fuzzy-sliding mode algorithm, then describes the background knowledge about applying to the antenna sub-reflector. The main content of this paper is simulation and comparative analysis,...
In this paper an investigation of the Doubly-Fed Induction Generator's start-up procedure, using zero crossing method for the grid voltage's angle's calculation, is carried out in the environment of Matlab/ Simulink. Moreover, the significance of the phase displacement and the amplitude deviation of the stator voltage in the system's synchronization procedure is highlighted via simulation.
The modern design of an induction traction machine includes a complex of coupled electromagnetic and thermal analyses for effective utilization of machine's space. This paper summarizes a comparison between less and more complicated ways of induction machine's modelling.
For sensorless position detection of permanent magnet synchronous machines at very low speed and standstill, signal injection methods are commonly used. As a prerequisite these so called saliency-tracking methods require a differential magnetic anisotropy of the machine, which is both position and load dependent and thus varying during operation. So the performance of sensorless operation strongly...
An applicative sensorless vector control with an additional current loop has been developed. The proposed method is suitable for applications such as compressors and pumps that have position-dependent load torque properties because the basic concepts of the proposed method keep motor phase current constant. That is to say, the proposed controller reduces peak current and suppresses rotor speed fluctuation...
In order to facilitate exchanging and sharing data between the domestic and international main tools for power system electromechanical transient analysis, this paper analyzes and compares the common mathematical models for transient stability including synchronous generator, excitation system, turbine and governor, load and even DC transmission system in PSD-BPA and PSS/E. Several typical problems...
The control of active and reactive power of a doubly-fed machine (DFM) can be—due to the application of power electronics—very rapid, comparable to the control of FACTS devices. Besides DFMs in pumping-storage plants will become an important part of Slovenian electric-power system and it is important to know how these machines are working. This paper presents how to model a control of a DFM in a pumping-storage...
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.