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The aim of this paper is to analyze dynamics of isolated electrical grid during short term interruptions. The effect of short term interruptions of the power supply on the characteristic values of synchronous generator in autonomous operation is analyzed. Dynamical loads (two induction motors), are connecting to the grid. Short-term interruptions that occur in different moments allow analyze of this...
In this paper, modeling and simulation of a 500 KW prototype wind turbine that is being developed in the context of the MILRES (National Wind Energy Systems) Project in Turkey are presented. This prototype wind turbine has a nominal power of 500 KW at a nominal wind speed of around 11 m/s. Aerodynamic, mechanical, electrical and control models are built in S4WT (Samcef for Wind Turbines) environment...
This paper presents a novel flux barrier type outer rotor interior permanent magnet (IPM) motor which has both rare-earth and ferrite magnets. The proposed IPM motor has two air layers in the outer rotor. The rare-earth magnets are inserted into the first layer, while the ferrite magnets are placed into the second one. The torque performance of the proposed IPM motor is larger than that of the conventional...
Physical meaning of the instantaneous space vector of salient permanent magnet synchronous machine is studied. For this purpose, we define real physical space vectors. The electromagnetic torque is derived by current and flux densities. A space vector diagram in transient state is derived and discussed.
This paper presents a fuzzy type-2 controller applied on a direct torque control (DTC) of a permanent magnet synchronous motor (PMSM), using DTC technique and space vector modulation (SVM). In the conventional DTC a hysteresis controllers are used to limit the flux and torque in the control band while in the SVM DTC the controllers are replaced by PI FLC controllers. The torque dynamic response is...
This paper presents that analysis of the characteristics according to pole/slot combination is analyzed under a stator-turn fault. Industrial energy system has serious loss when being fault. For fault analysis according to pole/slot combination, this paper is made of the modeling of 8-pole 12-slot and 10-pole 12-slot motors using the developed FEM-base model and analyzed the torque characteristic...
In this paper, we propose a modeling technique for the classification of the fault frequency components according to the fault state. Further, the optimal rotor design for an increase in reliability of an Interior Permanent Magnet type Brushless DC Motor (IPM type BLDCM) and a rise of the energy saving. For these improvements, fault states such as Dynamic Eccentricity Fault (DEF), Stator Inter-turn...
This paper presents theoretical analysis and experimental verification of the direct torque control (DTC) for permanent magnet synchronous motor (PMSM) drive. PMSM drive is characterized by the direct torque control based on space vector pulse-width modulation (SVPWM) method which is controlled by digital signal processor (DSP). Since the constant switching frequency is produced by SVM technique,...
The energy density of wave power is higher than some renewable energy sources such as wind and solar energy. However, because waves have an irregular reciprocating motion, it is difficult to convert wave power into electricity, and this has restricted the widespread use of wave power. In this paper, a new mechanism to convert wave power into electricity is proposed. It is referred to as a “direct-link”...
The extraction of energy from ocean waves has been investigated in Europe since the 1970s. Several devices have been proposed and a few of them have been built full scale and deployed to the ocean. Actually there is not a kind of device that is accepted as the most suitable to exploit wave power.
The goal of this paper is to review generator systems used in wind turbines and to determine suitable generator concepts for future high power wind turbines. An up to date state of the art of wind turbine generators is first presented. It will help, through a critical analysis, to identify limiting constraints to power rating increase of wind turbine generator systems. Finally, some potential solutions...
The paper presents the results of studying the specific problems that occurred during the exploitation of two 42 MVA bulb generators. The work focuses particularly on two groups of problems which were more pronounced on only one of the two hydropower units, and these are increased vibrations of the hydropower unit and electromechanical oscillations in the stationary and transition states, which significantly...
We present a step-by-step method for the design and control of a full-scale back-to-back converter for wind energy conversion systems using direct-drive electrically excited synchronous generators. First the system modeling is described in details. Then the converter controllers are designed and their PI parameters are systematically calculated using the symmetrical optimum method. Finally, the performances...
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