The Experts below are selected from a list of 21231 Experts worldwide ranked by ideXlab platform
Bangchun Wen - One of the best experts on this subject based on the ideXlab platform.
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Verification of self-synchronism of a nonlinear oscillatory system with double homodromy rotors
2015 IEEE International Conference on Mechatronics and Automation (ICMA), 2015Co-Authors: Xiaopeng Wei, Bangchun WenAbstract:The single-mass nonlinear oscillatory system is presented. The hard characteristics of vibration springs are taken into account. Based on Lagrange Equations, the motion differential equations of the oscillatory system are set up. Based on Hamilton principle, the Synchronous Operation condition of the system was deduced. According to the first order approximate stability discriminance, the steady-state condition of the oscillatory system in the balance point is obtained. With MATLAB/ Simulink, the dynamic equations of the system are solved by the 4-rank Runge-Kutta algorithm and the parameter data of the oscillatory system at steady state conditions are got. Substitute the obtained steady speed value into the expressions of vibration amplitude, the Synchronous Operation condition and the stability condition. Then the theoretic calculated results are obtained. By comparison with the calculated results and simulation data, the accuracy of theoretic derivation is proved. Finally, the self-synchronism experiment is conducted on a nonlinear vibration test platform. Through the comparison of experimental result and simulation data, it is observed that the measured parameter data are roughly identical to the simulation results.
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Dynamic Analysis and Experimental Study of Self-Synchronous Vibrating System Driven by Three Motors
2014Co-Authors: Degang Wang, Ruijun Han, Hongliang Yao, Bangchun WenAbstract:The self-Synchronous theory of the vibrating system driven by three motors is studied in this paper. Mathematics model of electromechanical coupling of the vibrating system driven by three motors is established, and the self-synchronization and stability conditions of Synchronous Operation of the vibrating system are deduced by using Hamilton principle. Synchronous experimental table is used to study the characteristic of vibration synchronization. The Synchronous experimental table can implement stable Operation of vibration synchronization when the parameters of the Synchronous experimental table meet the self-synchronization and stability conditions of Synchronous Operation deduced in the theoretical analysis. The experimental analysis validates the correctness of the theoretical analysis to the vibrating system, it provides theoretical basis for the design of the vibrating system driven by three or more motors.
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Optimization Design of a Vibrating System with Two Motors
Materials Science Forum, 2009Co-Authors: Dong Wang, K. Guo, Chun Yu Zhao, Bangchun WenAbstract:The dynamic model of vibrating system with two motors is established. Through dynamic analysis, the equations of frequency capture of the vibrating system and the conditions of implementing stable self-Synchronous Operation are obtained. Then the vibrating system is optimization designed based on the conditions of implementing stable self-Synchronous Operation. The simulation program with proper parameters of vibrating system is run, and the results show that the system is in a good Synchronous state. Computer simulations demonstrate that the vibrating system realizes speed synchronization and phase synchronization. The results verify the effectiveness of the optimization design.
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Synchronization of two non-identical coupled exciters in a non-resonant vibrating system of linear motion. Part I: Theoretical analysis
Shock and Vibration, 2009Co-Authors: Chun Yu Zhao, Hongtao Zhu, Ruizi Wang, Bangchun WenAbstract:In this paper an analytical approach is proposed to study the feature of frequency capture of two non-identical coupled exciters in a non-resonant vibrating system. The electromagnetic torque of an induction motor in the quasi-steady-state Operation is derived. With the introduction of two perturbation small parameters to average angular velocity of two exciters and their phase difference, we deduce the Equation of Frequency Capture by averaging two motion equations of two exciters over their average period. It converts the synchronization problem of two exciters into that of existence and stability of zero solution for the Equation of Frequency Capture. The conditions of implementing frequency capture and that of stabilizing Synchronous Operation of two motors have been derived. The concept of torque of frequency capture is proposed to physically explain the peculiarity of self-synchronization of the two exciters. An interesting conclusion is reached that the moments of inertia of the two exciters in the Equation of Frequency Capture reduce and there is a coupling moment of inertia between the two exciters. The reduction of moments of inertia and the coupling moment of inertia have an effect on the stability of Synchronous Operation.
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Synchronization of Two Non-Identical Coupled Exciters in a Non-Resonant Vibrating System of Linear Motion. Part II: Numeric Analysis
Shock and Vibration, 2009Co-Authors: Chun Yu Zhao, Hongtao Zhu, Tianju Bai, Bangchun WenAbstract:The paper focuses on the quantitative analysis of the coupling dynamic characteristics of two non-identical exciters in a non-resonant vibrating system. The load torque of each motor consists of three items, including the torque of sine effect of phase angles, that of coupling sine effect and that of coupling cosine effect. The torque of frequency capture results from the torque of coupling cosine effect, which is equal to the product of the coupling kinetic energy, the coefficient of coupling cosine effect, and the sine of phase difference of two exciters. The motions of the system excited by two exciters in the same direction make phase difference close to π and that in opposite directions makes phase difference close to 0. Numerical results show that Synchronous Operation is stable when the dimensionless relative moments of inertia of two exciters are greater than zero and four times of their product is greater than the square of their coefficient of coupling cosine effect. The stability of the Synchronous Operation is only dependent on the structural parameters of the system, such as the mass ratios of two exciters to the vibrating system, and the ratio of the distance between an exciter and the centroid of the system to the equivalent radius of the system about its centroid.
Wen Bang-chun - One of the best experts on this subject based on the ideXlab platform.
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Stability Research of Synchronous Operation of Dual-Motor Driven Vibrating System
Journal of Northeastern University, 2009Co-Authors: Wen Bang-chunAbstract:To investigate the stability of Synchronous Operation of a dual-motor driven vibrating system,a dynamic model of the system is developed for non-linear dynamic analysis.By the dimensionless processing of system parameters,a frequency capture equation of the vibrating system and the conditions for implementing the stable self-Synchronous Operation are obtained to calculate the stability domain of self-Synchronous Operation.Then,the vibrating system is optimally designed according to the conditions for stability and stability domain to regulate the system parameters.The computer simulation results showed that the vibrating system implements both the speed synchronization and phase synchronization,thus making the self-Synchronous state stable.The correctness of the conditions for stability and stability domain of self-Synchronous Operation has been verified,as well as the effectiveness of the optimal design.
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Stability of Synchronous Operation of Vibrating System Driven by Two Motors
Journal of Northeastern University, 2009Co-Authors: Wen Bang-chunAbstract:To investigate the stability of Synchronous Operation of a vibrating system driven by two motors,a dynamic model is developed for the system that was analyzed nonlinearly and dynamically.Making the parameters of the system dimensionless,the frequency trapping equations of the vibrating system and the conditions for implementing stable self-Synchronous Operation are both obtained,thus computing the stability region of self-Synchronous Operation.Then,the design of such a vibrating system is optimized on the basis of the conditions and stability region as above so as to readjust the parameters of the vibrating system.The simulation results showed that the synchronization of vibrating system comes true in either speed or phase to enable the system to be in a good self-Synchronous state.The correctness of the conditions for stability and stability region of self-Synchronous Operation and the effectiveness of the optimized design are therefore verified.
Olorunfemi Ojo - One of the best experts on this subject based on the ideXlab platform.
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Synchronous Operation of a dual-winding reluctance generator
IEEE Transactions on Energy Conversion, 1997Co-Authors: Olorunfemi OjoAbstract:This paper sets forth the analysis and performance characterization of the dual-winding reluctance machine fed with direct current control winding excitation operating as a generator. Saturation effect, core and harmonic losses are included in the dynamic and steady state models of the generator feeding either an impedance or a rectifier load which give calculation results that compare favorably with the experiment.
Rehaoulia Habib - One of the best experts on this subject based on the ideXlab platform.
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Fundamental analysis of Synchronous Operation of autonomous induction generator
2018 9th International Renewable Energy Congress (IREC), 2018Co-Authors: Selmi Mourad, Rehaoulia HabibAbstract:Wound rotor induction generator is widely used in variable speed generation systems due to its several advantages such as reduced converter size, improved efficiency, and economic benefits. This work presents a fundamental analysis of a Synchronous Operation of self excited wound rotor induction generator and discus its performances for two strategies of excitation. The different results discussed prove the superiority and the importance of the second strategy of excitation.
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Stand alone Synchronous Operation of wound rotor induction generator
2016 7th International Renewable Energy Congress (IREC), 2016Co-Authors: Selmi Mourad, Rehaoulia HabibAbstract:This work presents a steady state analysis of a Synchronous Operation of wound rotor induction generator in isolated area. In the presented wind energy system, the rotor circuit of the generator is excited by an alternative three phase system with a controlled magnitude and frequency of the excitation current. The different performances of the studied structure, under various condition of Operation, are determined and discussed. The presented results prove the efficiency of the suggested structure for producing electrical energy to supply the remote villages.
Zhe Chen - One of the best experts on this subject based on the ideXlab platform.
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Single-Electrical-Port Control of Cascaded Doubly-Fed Induction Machine for EV/HEV Applications
IEEE Transactions on Power Electronics, 2017Co-Authors: Peng Han, Ming Cheng, Zhe ChenAbstract:A single-electrical-port control scheme, for four-quadrant Operation of cascaded doubly-fed induction machine (CDFIM), which has long been conceived as a motor or generator only suitable for limited two-quadrant Operation, is proposed and theoretically demonstrated. The drive system is configured as a master/slave architecture, that is, the power winding is supplied with a constant-voltage constant-frequency inverter, termed as the master inverter, in an open-loop way, while the control winding is fed by a closed-loop field-oriented-controlled (FOC) variable-voltage variable-frequency inverter, termed as slave inverter. With this configuration, the control emphasis is placed on the slave inverter, yielding reduced control complexity and cost, and the inaccuracy of flux estimation in conventional FOC for singly-fed induction machines is avoided at very low or even zero speed. It is found that the doubly-fed Synchronous Operation of the CDFIM can achieve wider constant torque region and constant power region than the singly-fed Synchronous Operation. Simulations and experimental results are provided to verify the proposed drive configuration and control algorithm.
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Comparison of transient behaviors of wind turbines with DFIG considering the shaft flexible models
2008Co-Authors: Zhe Chen, Qiang GaoAbstract:In order to investigate the impacts of the integration of wind farms into utilities network, it is necessary to analyze the transient performances of wind power generation systems. In this paper, an assessment of the impact that the different representations of drive-train dynamics have on the electrical transient performances of doubly fed induction generator (DFIG) wind turbines with different Operationally states is investigated. In order to compare the transient performances of DFIG wind turbines during electrical transients, a DFIG model with simple one-mass lumped model and a two-mass shaft flexible model of wind turbine drive train systems are presented including the control strategies of the grid side and rotor side converters. The transient performances of DFIG wind turbines are evaluated under super- and sub-Synchronous Operation during different grid voltage dips. Simulation results have shown that it is needed to consider two mass shaft flexible model for the sake of exact analysis of transient behavior of DFIG wind turbines, especially when a more serious grid voltage dips occurs in power system and DFIG is at super-Synchronous Operation.
