Xi Cao
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Xi Cao has a total of 17 co-authors. Here are the top co-authors by number of shared publications:
- Mingyi Liu
Huaneng Clean Energy Research Institute, Changping, China
3 shared publications - Chong Xu
College of New Energy and Materials, State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, Changping 102249, China
2 shared publications Chuangui Xia
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, Changping, China
2 shared publicationsChuanzhao Cao
Huaneng Clean Energy Research Institute, Changping, China
2 shared publicationsGuang Ma
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, Changping, China
2 shared publicationsHaodong Lei
Huaneng Clean Energy Research Institute, Changping, China
2 shared publications
Latest Publications
- 27 June 2023
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Electronics
- Vol. 38 (10) , 12692-12703
A Resonant Switched-Capacitor Converter for Neutral-Point Voltage Balancing of Three-Level Inverters
Neutral-point voltage unbalancing is a common problem in three-level inverters. The original neutral-point voltage balancing circuit is the buck-boost converter. Since the inductor carries low frequency components, the power density is limited. At the same time, the efficiency is low because the soft switching cannot be realized. In this paper, a neutral-point voltage balance circuit based on resonant switched-capacitor converter (RSCC) is proposed. The proposed converter uses a series resonant inductor and resonant capacitor to transfer the unbalanced energy between two dc-link capacitors. Based on phase shift modulation, the RSCC circuit controls the output current to compensate the neutral-point current of the inverter to achieve the suppression of neutral-point voltage ripple. To achieve the minimum loss, a step-by-step optimal design is presented and the optimal switching frequency, resonant inductance and resonant capacitance can be derived. The proposed circuit has the advantages that all switches of RSCC can realize the zero voltage switching (ZVS), and the magnetic volume can be greatly reduced because only high frequency components flow through the inductor. A 400V-10A prototype of RSCC and the inverter is built, and main experimental results are provided to verify the time-domain analysis and the effectiveness of the proposed RSCC voltage balance circuit.
- 27 June 2023
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Electronics
- Vol. 38 (10) , 12692-12703
A Resonant Switched-Capacitor Converter for Neutral-Point Voltage Balancing of Three-Level Inverters
Neutral-point voltage unbalancing is a common problem in three-level inverters. The original neutral-point voltage balancing circuit is the buck-boost converter. Since the inductor carries low frequency components, the power density is limited. At the same time, the efficiency is low because the soft switching cannot be realized. In this paper, a neutral-point voltage balance circuit based on resonant switched-capacitor converter (RSCC) is proposed. The proposed converter uses a series resonant inductor and resonant capacitor to transfer the unbalanced energy between two dc-link capacitors. Based on phase shift modulation, the RSCC circuit controls the output current to compensate the neutral-point current of the inverter to achieve the suppression of neutral-point voltage ripple. To achieve the minimum loss, a step-by-step optimal design is presented and the optimal switching frequency, resonant inductance and resonant capacitance can be derived. The proposed circuit has the advantages that all switches of RSCC can realize the zero voltage switching (ZVS), and the magnetic volume can be greatly reduced because only high frequency components flow through the inductor. A 400V-10A prototype of RSCC and the inverter is built, and main experimental results are provided to verify the time-domain analysis and the effectiveness of the proposed RSCC voltage balance circuit.