An Improved Overmodulation Strategy for a Three-Level NPC Inverter Considering Neutral-Point Voltage Balance and Common-Mode Voltage Suppression

Zhixun Ma, Haichuan Niu, Xiang Wu, Xu Zhang and Guobin Lin ()
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Zhixun Ma: National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai 201804, China
Haichuan Niu: National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai 201804, China
Xiang Wu: School of Electrical Engineering, China University of Mining and Technology, Xuzhou 221008, China
Xu Zhang: National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai 201804, China
Guobin Lin: National Maglev Transportation Engineering R&D Center, Tongji University, Shanghai 201804, China

Sustainability, 2022, vol. 14, issue 19, 1-16

Abstract: The three-level neutral-point clamped voltage source inverter (3L-NPC-VSI) is widely used in the maglev traction systems due to its high output voltage, large output capacity and low output current harmonics. In order to improve the utilization of the DC-bus voltage, an overmodulation strategy is necessary. This paper proposes an improved overmodulation strategy based on the minimum amplitude error method for a 3L-NPC-VSI. Compared with the conventional overmodulation strategy based on the minimum amplitude error method, the utilization of the DC-bus voltage is higher. Meanwhile, a virtual space vector modulation strategy is adopted for inverter neutral-point (NP) voltage balance and common-mode voltage (CMV) suppression. Furthermore, the suppression of leakage current also has been verified. Furthermore, the implementation details of the proposed overmodulation strategy based on minimum amplitude error method is elaborated. The effectiveness of the proposed method is verified by simulation and experimental results.

Keywords: three-level neutral-point clamped voltage source inverter (3L-NPC-VSI); maglev traction systems; overmodulation; virtual space vector (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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