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RISS 인기검색어
- 검색키워드
- 저자 : Xiucheng Dong (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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An Improved SPWM Strategy to Reduce Switching in Cascaded Multilevel Inverters
Dong, Xiucheng,Yu, Xiaomei,Yuan, Zhiwen,Xia, Yankun,Li, Yu The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
The analysis of the switch status of each unit module of a cascaded multi-level inverter reveals that the working condition of the switch of a chopper arm causes unnecessary switching under the conventional unipolar sinusoidal pulse width modulation (SPWM). With an increase in the number of cascaded multilevel inverters, the superposition of unnecessary switching gradually occurs. In this work, we propose an improved SPWM strategy to reduce switching in cascaded multilevel inverters. Specifically, we analyze the switch state of the switch tube of a chopper arm of an H-bridge unit. The redundant switch is then removed, thereby reducing the switching frequency. Unlike the conventional unipolar SPWM technique, the improved SPWM method greatly reduces switching without altering the output quality of inverters. The conventional unipolar SPWM technique and the proposed method are applied to a five-level inverter. Simulation results show the superiority of the proposed strategy. Finally, a prototype is built in the laboratory. Experimental results verify the correctness of the proposed modulation strategy.
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The risk evaluation for technology innovation of China's oil and gas industry
Dong Xiucheng,Li Junchen,Gao Jian 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Risk evaluation is necessary to technology innovation, especially in oil and gas industry, which is characterized by technology intensity. China has a developing oil and gas industry, so the risk evaluation is much more important to its technology innovation. After summarizing researches of other experts, this paper evaluates the technology innovation risk for China"s oil and gas industry with multihierarchy grey method. The evaluation results show that technology innovation risk for China"s oil and gas industry is relatively high. Suitable measures must be taken to diminish this risk and this paper gives some useful suggestions finally.
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An Improved SPWM Strategy to Reduce Switching in Cascaded Multilevel Inverters
Xiucheng Dong,Xiaomei Yu,Zhiwen Yuan,Yankun Xia,Yu Li 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
The analysis of the switch status of each unit module of a cascaded multi-level inverter reveals that the working condition of the switch of a chopper arm causes unnecessary switching under the conventional unipolar sinusoidal pulse width modulation (SPWM). With an increase in the number of cascaded multilevel inverters, the superposition of unnecessary switching gradually occurs. In this work, we propose an improved SPWM strategy to reduce switching in cascaded multilevel inverters. Specifically, we analyze the switch state of the switch tube of a chopper arm of an H-bridge unit. The redundant switch is then removed, thereby reducing the switching frequency. Unlike the conventional unipolar SPWM technique, the improved SPWM method greatly reduces switching without altering the output quality of inverters. The conventional unipolar SPWM technique and the proposed method are applied to a five-level inverter. Simulation results show the superiority of the proposed strategy. Finally, a prototype is built in the laboratory. Experimental results verify the correctness of the proposed modulation strategy.
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Nonlinear Adaptive Control for Dynamic and Dead-zone Uncertainties in Robotic Systems
Xia Liu,Wei Jiang,Xiucheng Dong 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2
Accurate position tracking performance of robotic systems with both dynamic and dead-zone uncertaintiesis difficult to achieve by traditional adaptive control. In this paper, for nonlinear robotic systems in the presenceof uncertain dynamics and dead-zone, an adaptive control scheme is employed to guarantee accurate and stable positiontracking. The dynamics of the robot and dead-zone parameters are concurrently estimated in the adaptationlaws and the estimated values are subsequently applied in the control law. In order to demonstrate the practicabilityof this paper, an experimental setup composed of Phantom Omni robots are built. The experimental results showthat even when the dynamic and dead-zone uncertainties simultaneously appear, the robot can well track any desiredposition trajectory.
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