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RISS 인기검색어
- 검색키워드
- 저자 : Zedong Zheng (검색결과 5 건)
- 무료
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- 유료
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Novel Position Controller for PMSM Based on State Feedback and Load Torque Feed-Forward
Zheng, Zedong,Li, Yongdong,Fadel, Maurice The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.2
In this paper, a novel position controller based on state feedback and feed-forward is proposed. Traditional position and speed controllers are replaced by a single controller with the position and speed as state feedbacks, and the position command and load torque as feed-forwards. The feedback and feed-forward gains are obtained by analytic modeling and design. The load torque, rotor speed and position are estimated by an observer based on a Kalman filter (KF) with a low resolution mechanical position sensor. Feed-forward compensation by an estimated load torque is used to improve the dynamic performance during load torque changes.
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Novel Position Controller for PMSM Based on State Feedback and Load Torque Feed-Forward
Zedong Zheng,Yongdong Li,Maurice Fadel 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.2
In this paper, a novel position controller based on state feedback and feed-forward is proposed. Traditional position and speed controllers are replaced by a single controller with the position and speed as state feedbacks, and the position command and load torque as feed-forwards. The feedback and feed-forward gains are obtained by analytic modeling and design. The load torque, rotor speed and position are estimated by an observer based on a Kalman filter (KF) with a low resolution mechanical position sensor. Feed-forward compensation by an estimated load torque is used to improve the dynamic performance during load torque changes.
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A Nine-level ANPC/H-Bridge Inverter for Open-Winding Motor Drive System
Xiaohui Xu,Kui Wang,Nianzhou Liu,Zedong Zheng,Yongdong Li 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In order to increase the output power and voltage levels, a nine-level ANPC/H-Bridge inverter for high power medium voltage motor drive applications is presented in this paper. Each phase of this inverter consists of two fivelevel ANPC bridges and all the phases are powered by a common DC-link, which is very suitable for ship integrated electric propulsion with open-winding multi-phase motors. A hybrid modulation method is adopted to control this inverter. The series connected or high-voltage switches in all the fivelevel ANPC bridges are operated at fundamental frequency and the other switches are controlled with PS-PWM, which is easy to implement and can achieve the natural voltage balance of the neutral-point potential and flying capacitor voltages. A capacitor voltage balancing method based on this hybrid modulation method is also proposed. Simulation and experimental results are presented to verify the validity of this method.
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Gu, Chunyang,Krishnamoorthy, Harish S.,Enjeti, Prasad N.,Zheng, Zedong,Li, Yongdong The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
A new type of topology with medium-frequency-transformer (MFT) isolation for medium voltage wind power generation systems is proposed in this paper. This type of converter is a high density power conversion system, with high performance features suitable for next generation wind power systems in either on-shore or off-shore applications. The proposed topology employs single-phase cascaded multi-level AC-AC converters on the grid side and three phase matrix converters on the generator side, which are interfaced by medium frequency transformers. This avoids DC-Link electrolytic capacitors and/or resonant L-C components in the power flow path thereby improving the power density and system reliability. Several configurations are given to fit different applications. The modulation and control strategy has been detailed. As two important part of the whole system, a novel single phase AC-AC converter topology with its reliable six-step switching technique and a novel symmetrical 11-segment modulation strategy for two stage matrix converter (TSMC) is proposed at the special situation of medium frequency chopping. The validity of the proposed concept has been verified by simulation results and experiment waveforms from a scaled down laboratory prototype.
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Chunyang Gu,Harish S. Krishnamoorthy,Prasad N. Enjeti,Zedong Zheng,Yongdong Li 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
A new type of topology with medium-frequency-transformer (MFT) isolation for medium voltage wind power generation systems is proposed in this paper. This type of converter is a high density power conversion system, with high performance features suitable for next generation wind power systems in either on-shore or off-shore applications. The proposed topology employs single-phase cascaded multi-level AC-AC converters on the grid side and three phase matrix converters on the generator side, which are interfaced by medium frequency transformers. This avoids DC-Link electrolytic capacitors and/or resonant L-C components in the power flow path thereby improving the power density and system reliability. Several configurations are given to fit different applications. The modulation and control strategy has been detailed. As two important part of the whole system, a novel single phase AC-AC converter topology with its reliable six-step switching technique and a novel symmetrical 11-segment modulation strategy for two stage matrix converter (TSMC) is proposed at the special situation of medium frequency chopping. The validity of the proposed concept has been verified by simulation results and experiment waveforms from a scaled down laboratory prototype.
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