Jiangsu Province Special Equipment Safety Supervision Inspection Institute Branch

Wuxi, China

Jiangsu Province Special Equipment Safety Supervision Inspection Institute Branch

Wuxi, China
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Xu P.,Jiangsu University | Shi K.,Jiangsu University | Shi K.,KTK Group | Bu F.,Nanjing University of Aeronautics and Astronautics | And 4 more authors.
Energies | Year: 2016

In order to broaden the limited utilization range of wind power and improve the charging and discharging control performance of the storage battery in traditional small wind power generation systems, a wind power system based on a vertical-axis off-grid induction generator is proposed in this paper. The induction generator not only can run in a wide wind speed range but can also assist the vertical-axis wind turbine to realize self-starting at low wind speed. Combined with the maximum power point tracking method, the slip frequency control strategy is employed to regulate the pulse width modulation (PWM) converter to control the output power of the proposed system when the wind speed and load change. The charge and discharge of the storage battery is realized by the segmented current-limiting control strategy by means of an electric power unloader device connected to the DC bus. All these implement a balanced and stable operation of the proposed power generation system. The experimental research on the 5.5 kW prototype system is developed, and the corresponding results verify the correctness and feasibility of the system design and control strategy. Some comparison experiments with a magnetic suspension permanent magnet synchronous generator (PMSG) demonstrate the application prospect of the proposed vertical-axis off-grid induction generator wind power system. © 2016 by the authors; licensee MDPI.


Xu P.,Jiangsu University | Shi K.,Jiangsu University | Zhao D.,Jiangsu University | Liu R.,KTK Group | Zhu Y.,Jiangsu Province Special Equipment Safety Supervision Inspection Institute Branch
Modelling, Measurement and Control A | Year: 2016

Aim at photovoltaic system or wind power system outputting constant DC voltage, research on the control strategy of grid-connected inverter suitable for such system is put forward in this paper. A novel dual-loop control structure that consists of power outer-loop and current inner-loop is proposed. The reference value of the outer-loop is provided by maximum power point tracking and integrative system operation status, and the active current component is given by the power outer-loop regulator. Finally, the stable operation under different power factor of the grid-connected inverter is realized by the current inter-loop regulator. Modeling and simulation research work based on MATLAB 7.1 is carried out in the paper. A prototype of 30kW rated grid-connected inverter is tested on developed wind simulation operation platform in the laboratory. Simulation and experimental results verified correctness and effectiveness of control structure and strategy of grid-connected inverter. © 2016, AMSE Press. All rights reserved.

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