High-Switching-Frequency SiC Power Conversion Systems with Improved Finite Control Set Method Prediction Control

Yibiao Fan (), Lixia Tong, Yingjie Lu, Xiaowei Cai, Zhihe Fu and Xingkui Mao
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Yibiao Fan: Physics, Mechanical and Electrical Engineering, Longyan University, Longyan 364012, China
Lixia Tong: Institute for Testing of Industrial Products, Jiangxi General Institute of Testing and Certification, Nanchang 330052, China
Yingjie Lu: College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350011, China
Xiaowei Cai: Physics, Mechanical and Electrical Engineering, Longyan University, Longyan 364012, China
Zhihe Fu: Physics, Mechanical and Electrical Engineering, Longyan University, Longyan 364012, China
Xingkui Mao: College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350011, China

Energies, 2024, vol. 17, issue 18, 1-14

Abstract: With the development of power conversion systems or bidirectional grid-connected inverters characterized by high DC voltage, high efficiency, and high-power density, high-switching-frequency SiC power switches are being widely used, and these require a short computational time of control algorithm. Based on the sector judgment of a space voltage vector and the midpoint potential control balancing of a DC bus, an improved finite control set method prediction control (FCS-MPC) method was proposed for a T-type three-level PCS. This improved FCS-MPC first judges the sector of the space voltage vector and locates the position of the corresponding large sector according to phase lock information; then, it analyzes the sampled voltage of the upper and lower bus capacitors to obtain the midpoint potential situation and selects appropriate small vectors based on the midpoint potential situation. This simple improved strategy can reduce the computational complexity of traditional MPC for rolling optimization, resulting in a reduction in the vectors from 27 to 8. A SiC-based 10 kW bidirectional PCS prototype verified the improved FCS-MPC, and the computational time was reduced about by 56% in comparison to traditional FCS-MPC.

Keywords: bidirectional power conversion system; T-type three-level topology; SiC; FCS-MPC (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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