Control Strategy of Single-Phase Three Level Neutral Point Clamped Cascaded Rectifier

Xiaoqiong He, Xiaolan Lin, Xu Peng, Pengcheng Han, Zeliang Shu and Shibin Gao
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Xiaoqiong He: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Xiaolan Lin: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Xu Peng: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Pengcheng Han: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Zeliang Shu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Shibin Gao: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China

Energies, 2017, vol. 10, issue 5, 1-16

Abstract: Single-phase 3-level neutral point clamped cascaded rectifier (3LNPC-CR) has been successfully made its way into traction drive system as a high-voltage traction converter. In this passage, the control issue of the 3LNPC-CR is considered. A transient current control strategy, combined with proportional integral (PI) controllers, is adopted to achieve unity power factor, satisfactory sinusoidal grid current, regulated overall dc voltage, and even efficient voltage balance between each module. Besides, with regard to the instinct voltage fluctuation problem among dc-link capacitors in one 3-level neutral point clamped (3LNPC) rectifier module, a phase shift carrier space vector pulse width modulation (PSC-SVPWM) worked along with a reasonable redundancy selection scheme is addressed. In addition, two auxiliary balancing circuits for a single-phase 3LNPC rectifier is proposed. The voltage balancing capacity of these internal-module balancing schemes are analyzed and compared. Finally, the control performance of these proposed strategies are verified by simulations and experiments.

Keywords: 3-level neutral point clamped cascaded rectifier (3LNPC-CR); phase shift carrier space vector pulse width modulation (PSC-SVPWM); capacitor voltage balancing; mutual-module voltage balancing (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: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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