Aiming at the difficulty of setting the weight coefficient in the value function of model predictive torque control(MPTC)for permanent magnet synchronous motor(PMSM)driven by three-level inverter,a fine-division model...Aiming at the difficulty of setting the weight coefficient in the value function of model predictive torque control(MPTC)for permanent magnet synchronous motor(PMSM)driven by three-level inverter,a fine-division model predictive flux control(MPFC)method is proposed.First,establish a mathematical model between the motor torque and the stator flux linkage according to the mathematical equations of PMSM.Thus,the control of the motor torque and stator flux linkage in the MPTC is transformed into the control of a single stator flux linkage vector,omitting the cumbersome weight setting process in the traditional MPTC.The midpoint potential control strategy is proposed,which uses the characteristics of redundant small vectors to balance the midpoint potential.After that,a fine-division strategy is proposed,which effectively reduces the number of candidate vectors and the computational burden of the system.Finally,the proposed MPFC is compared with MPTC by simulation.The results show that the proposed fine-division MPFC effectively reduces the system calculation,and has the advantages of simple principle and better dynamic and steady-state control performance.The feasibility of the control strategy is verified.展开更多
Foreign teaching and Chinese language teaching of minority are two different forms of teaching in nature, both the nature and the system of teaching are different, but in the teaching objectives, content, principles, ...Foreign teaching and Chinese language teaching of minority are two different forms of teaching in nature, both the nature and the system of teaching are different, but in the teaching objectives, content, principles, methods, and therefore there are many similarities, so two studies outcomes can learn from each other. In this paper, with voice teaching as an example, we will talk about foreign language studies in ethnic minority Chinese Teaching. I think, in the teaching program design, the teaching Chinese minorities can learn from the simplified idea of teaching phonological Mr. Zhao Jin ruing, which is proposed foreign teaching Chinese, to simplify Voice teaching. In teaching principles, we should emphasize specific principles, instructional design based on students＇ different characteristics. In the teaching content, teaching should not only pay attention phonetic syllables within the system, but also more emphasis on syllables voice level teaching, especially teaching speech flow. In teaching methods, we should learn teaching, research tone, softly and so on.展开更多
Researchers from the CAS Key Laboratory of Quantum Information,University of Science and Technology of China have just achieved a significant progress in quantum key distribution research.Based on the self-developed a...Researchers from the CAS Key Laboratory of Quantum Information,University of Science and Technology of China have just achieved a significant progress in quantum key distribution research.Based on the self-developed active switching technology,they successfully conducted the world's longest-more than 90km-round-robin differential phase shift(RRDPS)quantum key distribution experiment.展开更多
The brittleness analysis and important nodes detection have been a hot spot in the complex networks.How to get the overall feature of the whole network and how to find out some important nodes are requisites to solve ...The brittleness analysis and important nodes detection have been a hot spot in the complex networks.How to get the overall feature of the whole network and how to find out some important nodes are requisites to solve these problems. In this paper, we adopt the trace of the adjacency matrix and the centrality of the complex networks to give a quantitative and qualitative analysis of networks being studied. Results show that the k-shell plays a more important role than the degree centrality and the betweenness in finding important nodes, and it can also be used to give direction on the immunization and maintenance of complex networks.展开更多
The massive State Council restructuring creates new ministries,cuts or merges others The institutional restructuring plan ofthe State Council,China’s cabinet,was adopted on March 17 at the FifthPlenary Meeting of the...The massive State Council restructuring creates new ministries,cuts or merges others The institutional restructuring plan ofthe State Council,China’s cabinet,was adopted on March 17 at the FifthPlenary Meeting of the First Session of the 13thNational People’s Congress（NPC）,the nationallegislature of China.展开更多
基金National Natural Science Foundation of China(No.51867012)。
文摘Aiming at the difficulty of setting the weight coefficient in the value function of model predictive torque control(MPTC)for permanent magnet synchronous motor(PMSM)driven by three-level inverter,a fine-division model predictive flux control(MPFC)method is proposed.First,establish a mathematical model between the motor torque and the stator flux linkage according to the mathematical equations of PMSM.Thus,the control of the motor torque and stator flux linkage in the MPTC is transformed into the control of a single stator flux linkage vector,omitting the cumbersome weight setting process in the traditional MPTC.The midpoint potential control strategy is proposed,which uses the characteristics of redundant small vectors to balance the midpoint potential.After that,a fine-division strategy is proposed,which effectively reduces the number of candidate vectors and the computational burden of the system.Finally,the proposed MPFC is compared with MPTC by simulation.The results show that the proposed fine-division MPFC effectively reduces the system calculation,and has the advantages of simple principle and better dynamic and steady-state control performance.The feasibility of the control strategy is verified.
文摘Foreign teaching and Chinese language teaching of minority are two different forms of teaching in nature, both the nature and the system of teaching are different, but in the teaching objectives, content, principles, methods, and therefore there are many similarities, so two studies outcomes can learn from each other. In this paper, with voice teaching as an example, we will talk about foreign language studies in ethnic minority Chinese Teaching. I think, in the teaching program design, the teaching Chinese minorities can learn from the simplified idea of teaching phonological Mr. Zhao Jin ruing, which is proposed foreign teaching Chinese, to simplify Voice teaching. In teaching principles, we should emphasize specific principles, instructional design based on students＇ different characteristics. In the teaching content, teaching should not only pay attention phonetic syllables within the system, but also more emphasis on syllables voice level teaching, especially teaching speech flow. In teaching methods, we should learn teaching, research tone, softly and so on.
文摘Researchers from the CAS Key Laboratory of Quantum Information,University of Science and Technology of China have just achieved a significant progress in quantum key distribution research.Based on the self-developed active switching technology,they successfully conducted the world's longest-more than 90km-round-robin differential phase shift(RRDPS)quantum key distribution experiment.
文摘The brittleness analysis and important nodes detection have been a hot spot in the complex networks.How to get the overall feature of the whole network and how to find out some important nodes are requisites to solve these problems. In this paper, we adopt the trace of the adjacency matrix and the centrality of the complex networks to give a quantitative and qualitative analysis of networks being studied. Results show that the k-shell plays a more important role than the degree centrality and the betweenness in finding important nodes, and it can also be used to give direction on the immunization and maintenance of complex networks.
文摘The massive State Council restructuring creates new ministries,cuts or merges others The institutional restructuring plan ofthe State Council,China’s cabinet,was adopted on March 17 at the FifthPlenary Meeting of the First Session of the 13thNational People’s Congress（NPC）,the nationallegislature of China.
