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RISS 인기검색어
- 검색키워드
- 저자 : Shanmei Cheng (검색결과 4 건)
- 무료
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- 유료
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A Novel Hybrid Speed Controller of the Vector Control System
Shanmei Cheng,Bo Gong,Jiangcheng Wang 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
In this paper, a hybrid speed controller based on proportional integral (PI) controller and artificial neural network(ANN) is proposed as a speed controller for an indirect field oriented induction motor vector control system. The new controller has self-learning and self-organization capabilities. Its parameters are adjusted online according to back propagation (BP) algorithm. The weighting coefficients of the hidden layer are constant, and learning is realized by auto-tuning of connective weights between the hidden nodes and the output nodes. So the controller has the advantages of simple structure and less calculation. A vector control system with hybrid speed controller is verified by experiments. The experimental results show the hybrid speed controller can get rapid dynamic response with almost no overshoot, good robustness and control performance.
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Sensorless Vector Control for Permanent Magnet Synchronous Motor Fed by Three-Level Inverter
Jiangcheng Wang,Shanmei Cheng,Bo Gong 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
Three-level inverters and relative techniques have been concerned more and more in industrial drive applications because of the outstanding performance. The aim of this paper is to present a strategy for the sensorless vector control of Permanent Magnet Synchronous Motor (PMSM) drive fed with a three-level Neutral-Point-Clamped (NPC) inverter. By measuring the different current change rates which are caused by the voltage vectors applied to the motor by the Space Vector Modulation (SVM) scheme for three-level inverter, signals that contain the information of rotor position are obtained. Therefore, the rotor angle can be calculated. Since none of any prior knowledge of the PMSM parameters is used, the position estimation accuracy is not affected by the parameters variation or measurement error. Furthermore, taking advantages of the three-level voltage inverter, the ripples of torque as well as the harmonics of the phase voltages are significantly reduced. The simulation results demonstrate that the proposed strategy is effective and this system operates well over a wide speed range.
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A High Efficiency Two-stage Inverter for Photovoltaic Grid-connected Generation Systems
Liu, Jiang,Cheng, Shanmei,Shen, Anwen The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.1
Conventional boost-full-bridge and boost-hybrid-bridge two-stage inverters are widely applied in order to adapt to the wide dc input voltage range of photovoltaic arrays. However, the efficiency of the conventional topology is not fully optimized because additional switching losses are generated in the voltage conversion so that the input voltage rises and then falls. Moreover, the electrolytic capacitors in a dc-link lead to a larger volume combined with increases in both weight and cost. This paper proposes a higher efficiency inverter with time-sharing synchronous modulation. The energy transmission paths, wheeling branches and switching losses for the high-frequency switches are optimized so that the overall efficiency is greatly improved. In this paper, a contrastive analysis of the component losses for the conventional and proposed inverter topologies is carried out in MATLAB. Finally, the high-efficiency under different switching frequencies and different input voltages is verified by a 3 kW prototype.
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A High Efficiency Two-stage Inverter for Photovoltaic Grid-connected Generation Systems
Jiang Liu,Shanmei Cheng,Anwen Shen 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.1
Conventional boost-full-bridge and boost-hybrid-bridge two-stage inverters are widely applied in order to adapt to the wide dc input voltage range of photovoltaic arrays. However, the efficiency of the conventional topology is not fully optimized because additional switching losses are generated in the voltage conversion so that the input voltage rises and then falls. Moreover, the electrolytic capacitors in a dc-link lead to a larger volume combined with increases in both weight and cost. This paper proposes a higher efficiency inverter with time-sharing synchronous modulation. The energy transmission paths, wheeling branches and switching losses for the high-frequency switches are optimized so that the overall efficiency is greatly improved. In this paper, a contrastive analysis of the component losses for the conventional and proposed inverter topologies is carried out in MATLAB. Finally, the high-efficiency under different switching frequencies and different input voltages is verified by a 3 kW prototype.
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