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- 저자 : Caiyong Ye (검색결과 3 건)
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Caiyong Ye,Jintao lu,Shanming Wan,Xiaodong Qi 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.4
Synchronous vibration caused by rotor eccentricity is an important obstacle to the development of an active magnetic bearing (AMB) system. To solve this problem, a novel autobalancing control strategy has been proposed, which includes a static learning process and dynamic feedforward current injection process. In this algorithm, a dynamic response process under unbalanced force is simulated by a static learning process. Then, a transfer function containing amplitude and phase information is obtained. According to the obtained transfer function information, a specific feedforward current is constructed to eliminate the synchronous component in the control current and realize the autobalancing of vibration displacement. Computational complexity compared with conventional control strategies is further investigated. Moreover, the velocity sensor is no longer needed in the proposed control strategy. The simulation and experimental results of the AMB system show that the synchronous component of the control current and the amplitude of the rotor vibration displacement can be significantly reduced.
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Sifeng Zhao,Caiyong Ye,Shanming Wan 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.2
For medium and high voltage drives, the three-level converter has better technical and economical performances than the two-level converter. Permanent magnetic brushless DC (BLDC) motors are widely used due to their simple control, lowresolution requirement of the position sensor, and high power density. The power switching devices in the non-conducting phase are blocked all the time when the two-phase conduction mode is used. Serious overvoltage of the inner power switching device occurs, which triggers the overvoltage alarm or causes system failure. In this paper, the overvoltage mechanism of the inner power switching device is analyzed in detail, and a mixed conduction mode containing a three-phase conduction mode in the first stage and a two-phase conduction mode in the second stage is proposed. The speed threshold for the switching of the two control modes is designed to suppress overvoltage in the starting stage and to reduce the loss of the converter at high speeds. The effectiveness of the overvoltage suppression and system safety of the proposed mixed conduction mode are verified by simulations and experiments.
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Yuan, Pei,Yu, Kexun,Ye, Caiyong,Ren, Zhang'ao Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.4
This paper presents a nontraditional laser power system in which an active compensated pulsed alternator (ACPA) drives a flashlamp directly without the use of capacitor groups. As a result, the volume of the laser system is decreased because of the high energy density of the ACPA. However, the difficulty in matching the output of the alternator with the laser flashlamp is a significant issue and needs to be well analyzed. In order to solve this problem, based on the theory for ACPA, the authors propose a simplified model for the system of ACPA with flashlamp load by the way of circuit simulation. The simulation results preliminarily illuminate how the performance of the ACPA laser power system is affected. Meanwhile, the simulation results can also supply a consultation for future ACPA laser power system design and control.
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