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 brushless doubly-fed double stator double rotor (DSDR) generator based on permanent magnet field modulation for the wind power application is proposed in this paper. This generator adopted double stator to achieve the decoupling of the control winding and power winding. To improve the power density, a freely rotating rotor is introduced. To achieve the variable-speed constant-frequency operation...
This paper presents a fault diagnosis method for direct-drive wind turbine with permanent magnet synchronous generator (D-PMSG) by using generator control loop current signals. In this method, the Vold-Kalman filtering order tracking technique is used to track the fault characteristic harmonic components from q-axis current signals. Then the envelopes of amplitudes of the fault harmonic components...
A novel variable-speed wind power generation system with constant-frequency double-rotor (CFDR) generator is proposed which combines the advantages of low cost, good dynamical performance and high reliability. In this paper, the structure of the proposed wind power generation system is introduced and the working principle of the CFDR generator is presented. The control strategy of the wind power generation...
As the wind turbine is a nonlinear high-order system, to achieve good pitch control performance, model free adaptive control (MFAC) approach which doesn't need the mathematical model of the wind turbine is adopted in the pitch control system in this paper. A pseudo gradient vector whose estimation value is only based on I/O data of the wind turbine is identified and then the wind turbine system is...
The doubly salient permanent magnet (DSPM) machine with full-pitched windings has the advantages such as high power density and high reliability, which has the potential in the applications of wind power generation. There are different ways to improve the full pitched DSPM machine for high performance. Then three topologies of the full pitched DSPM generator are proposed in this paper. The structure...
The ultrasonic torsional vibration acoustic system is devised. The system consists of a ultrasonic generator, two longitudinal transducer, two longitudinal horn, a reverse horn and bearing components. It is of the vibration frequency 20.7 KHz and ultrasonic vibration amplitude 15 μm. The system is installed in the Lathe Slide to boring the precision deep hole. Ultrasonic generator has been improved...
A new constant-frequency double-rotor (CFDR) generator for the wind power generation is proposed in this paper. The CFDR generator needs only part-size power converter which is the same as that of the doubly-fed induction generator. As permanent magnets are mounted on the outer rotor of the CFDR generator, high performances may be achieved. In this paper, the structure of the double-rotor generator...
It is the main objective for conventional variable-speed constant frequency wind energy conversion system (WECS) below the rated power to realize maximum power point tracking (MPPT). This paper presents a double objectives control scheme for WECS. Based on the frequency separation principle, the wind speed is divided into two components, a slowly varying component, named seasonal, and a rapidly varying...
The conventional doubly salient permanent magnet (DSPM) machine has concentrated windings in stator and unipolar flux linkage. This paper presents a novel single phase DSPM generator with full-pitched winding, offering higher efficiency and less copper consumption. The static characteristics of the proposed DSPM generator are analyzed based on the finite element method. It is shown that the full-pitched...
In this paper, direct torque control (DTC) technology of doubly-fed induction generator (DFIG) is analyzed in detail and applied to variable speed constant frequency wind power generation system. A rotor power factor adjustable DTC with maximum wind power tracking is discussed and rotor voltage vectors are obtained based on the look-up table. Based on the stochastic wind which is generated by the...
A new fault diagnosis method of inter-turn short circuit detection in generator rotor windings based on wavelet transform is presented. The detection method is based on the singularity characteristics of the induced electromotive force signal of search coil in the air gap. Electromagnetism characteristic of turbo-generator rotor windings is analyzed. Wavelet transform was applied to the detection...
The wind turbine codes predict wind turbine loads and response in high accuracy and can be used in controller design with the development of the computer technologies. In this paper open source FAST code developed by NREL is studied. The wind turbine controller is designed in the Matlab/Simulink environment and the FAST code is modeled as an S-function. The simulation of the control algorithms with...
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.