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103 results on '"Rongwu Zhu"'

101. Closure to Discussion on 'Virtual Damping Flux-Based LVRT Control for DFIG-Based Wind Turbine'

Author

Rongwu Zhu and Zhe Chen

Subjects
Engineering, Wind power, business.industry, 020209 energy, Voltage control, 020208 electrical & electronic engineering, Energy Engineering and Power Technology, Flux, 02 engineering and technology, Transient analysis, Turbine, law.invention, Inductance, Closure (computer programming), Control theory, law, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, business, Doubly fed electric machine
Abstract

Presents a closure to the discussion on the paper, “Virtual damping flux-based LVRT control for DFIG-based wind turbine,” (Zhu, R., et al; IEEE Trans. Energy Convers., vol. 30, pp. 714–725, Jun. 2015.

Published
2016

102. Model based methods for rotor position detection of doubly-fed induction generator

Author

Xiaojie Wu, Zhe Chen, Yunqian Zhang, and Rongwu Zhu

Subjects
Inductance, Physics, Stator, law, Squirrel-cage rotor, Rotor (electric), Control theory, Electromagnetic coil, Induction generator, Wound rotor motor, law.invention, Voltage
Abstract

Model based strategy to detect the initial position angle of doubly-fed induction generator (DFIG) is proposed in this paper. As the stator windings are open-circuit when the wind speed is below the cut-in speed, the stator flux is determined by both rotor position and currents. Based on the characteristic, the initial position angle of the rotor is derived by rotor voltage injection (RVI) method and rotor current close loop injection (RCCLI) method, respectively. Further, the two methods are validated by a scaled-down 7.5kW DFIG setup, and the results clearly show that with the RCCLI, the rotor initial position of DFIG can be accurately and fast detected for a DFIG with rated parameters and rotor resistance deviations.

Published
2014

103. Duty cycle-based three-level space-vector pulse-width modulation with overmodulation and neutral-point balancing capabilities for three-phase neutral-point clamped inverters.

Author

Rongwu Zhu, Xiaojie Wu, and Yi Tang

Subjects
PULSE width modulation, VOLTAGE control, ELECTRIC inverters, CAPACITORS, SWITCHING circuits, COMPUTER simulation
Abstract

In this study, a duty cycle-based space-vector pulse-width modulation (SVPWM) with overmodulation and capacitor voltage balance control for three-phase three-level neutral-point clamped (NPC) inverters is presented. On the basis of simple linear calculations of three-phase reference voltages, the proposed SVPWM can be derived, which avoids the trigonometry operation required by the conventional SVPWM. The modulation region can also be smoothly extended from the linear region to the overmodulation region through re-synthesising the three-phase reference voltages. This avoids the conventional non-linear function and look-up table. The neutral-point voltage balancing control is achieved via changing the duty cycle of the redundant small vectors in each switching period, which can be easily embedded into the proposed duty cycle-based SVPWM. The dynamic and steady-state performances of the proposed SVPWM are eventually verified by both simulation and experimental results. [ABSTRACT FROM AUTHOR]

Published
2015
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