A Modulation Strategy for Suppressing Current Ripple in H7 Current Source Inverters Through Coordinated Switching Operations

Weiqi Wang (), Longfei Wei, Xupeng Fang (), Xi Liang, Kun Li and Xiaoting Xia
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Weiqi Wang: College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Longfei Wei: College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Xupeng Fang: College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Xi Liang: PipeChina Northwest Company, Xi’an 710000, China
Kun Li: School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Xiaoting Xia: College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China

Energies, 2025, vol. 18, issue 2, 1-16

Abstract: The DC bus current ripple is a critical performance parameter affecting the operation of current source inverters (CSIs). In high-power applications, CSIs often operate at lower switching frequencies to minimize losses. However, maintaining low levels of DC bus current ripple necessitates the use of large inductors on the DC side, which increases the size, weight, and cost of the system. This paper first explores the inherent limitations of conventional CSI designs. Subsequently, it proposes a hierarchical coordinated switching modulation strategy based on the H7 current source inverter (H7-CSI) to address the issue of DC bus current ripple. By segmenting the zero-vector states, the proposed method fully utilizes the modulation freedom of the H7-CSI, achieving high-frequency chopping effects on the DC-side current. Experimental results show that the new modulation strategy reduces the amplitude of DC bus current ripple to 43% of that achieved by conventional CSIs under similar switching loss conditions. Furthermore, the dynamic performance of the proposed scheme remains consistent with conventional CSIs. Spectrally, this method exhibits improved performance in the low-frequency range and slightly degraded performance in the high-frequency range, although the latter remains within acceptable limits.

Keywords: current source inverter; current ripple; modulation (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: 2025
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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