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RISS 인기검색어
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- 저자 : Weiwen Xu (검색결과 4 건)
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Disturbance rejection speed sensorless control of PMSMs based on full order adaptive observer
Xu, Yanping,Wang, Li,Yuan, Weiwen,Yin, Zhonggang The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.5
Speed sensorless control systems with a full order adaptive observer of the permanent magnet synchronous motor (PMSM) have received wide attention due to their advantages of simple structure, easy implementation and strong universality. However, they are sensitive to the load disturbances, which affects the speed performance of the control system. To solve this problem, this paper presents a disturbance rejection speed sensorless control of PMSMs based on full order adaptive observer to improve robustness against load disturbances. A load disturbance observer (LDO) is used to observe load disturbances, which feed-forward compensates the q-axis current to reduce the speed drop and accelerate the recovery time. Experimental results show that the proposed method has better anti-interference capability than full order adaptive speed sensorless control under the same steady-state performance.
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Xu Yanping,Wang Chen,Yuan Weiwen,Li Zhifang,Yin Zhonggang 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
In the position sensorless control of permanent magnet synchronous motor (PMSM), the traditional sliding mode observer (SMO) uses the switching function, which presents serious chattering. Otherwise, the traditional SMO uses a low-pass filter to filter the harmonic components in the estimated back-EMF. The low-pass filter usually causes phase delay in the estimated rotor position. These problems restrict the further development of SMO. In this paper, an improved sliding mode observer (ISMO) with suppressed chattering and no phase delay is studied. In the ISMO, a sine saturation function is designed as the control function, and a synchronous reference frame filter (SRFF) is designed to eliminate the phase delay of ISMO. Different from other filters, the SRFF can not only filter out the harmonic components in the estimated back-EMF, but also effectively makes the phase delay almost zero. In addition, in order to improve the poor anti-disturbance performance of position sensorless control, a load disturbance observer (LDO) is introduced on the basis of the ISMO. The experimental results prove the effectiveness of the ISMO, and the addition of LDO improves the anti-disturbance ability of the system.
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A Scheduling Model of the Icebreaker Assistance Service in the Northern Sea Route
Yi Ding,Weiwen Zhou,Dongmin Xu,Guolong Lin 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.4
The melting of the sea ice in the Arctic area increases the possibility of exploiting the Northern Sea Route (NSR)by economic method. Compared to the traditional routes, navigating through the Northern Sea Route (NSR) will save much distance and time from Asia to Europe, but the ice condition along the NSR is a key obstacle to most vessels. To ensure the safety of the navigation, ice breaker assistance service becomes crucial. This paper introduces the procedure of icebreaker assistance service firstly, and then a static scheduling model is presented to illustrate icebreaker assistance service. Considering real operation, a dynamic model is proposed, and First Come First Serve (FCFS) principle is implemented into models. The experiment results show that this model is beneficial to control the average waiting time, while it may leads to wait too long for some vessels. And the average fuel cost of each trip remains stable even increasing service request.
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cDNA Cloning and Expression Analysis of a Novel Human F-Box Only Protein
Haipeng Cheng,Yushu Ma,Xiaohua Ni,Min Jiang,Lingchen Guo,Wei Jin,Weiwen Xu,Gentao Cao,Chaoneng Ji,Kang Ying,Shaohua Gu,Yuhong Ma,Yi Xie,Yumun Mao 한국분자세포생물학회 2002 Molecules and cells Vol.14 No.1
F-box proteins are an expanding family of eukaryotic proteins that are characterized by an approximately 40 amino acid motif. Some F-box proteins are critical for the controlled degradation of cellular regulatory proteins. During a large-scale sequencing analysis of a human fetal brain cDNA library, we isolated a cDNA clone that encodes a novel F-box protein. It showed a 90.0% identity with the previously isolated mouse F-box protein16 at the amino acid level. Northern blot analysis showed no detectable expression, while re-verse transcription-polymerase chain reaction analysis indicated that FBXO16 was expressed in the heart, spleen, and colon. By mapping, we localized the FBXO16 gene to the human chromosome 8p12. The FBXO16 gene consisted of 9 exons that spanned 67,816 bp of human genomic DNA.
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