Power Balance Modulation Strategy Based on Carrier Reconstruction for Cascaded Inverter

Affiliation of Author(s):自动化学院

Journal:Diangong Jishu Xuebao

Abstract:In view of the shortcomings of the existing modulation strategy applied to cascaded H-bridge (CHB) inverter, a novel power balance modulation strategy was proposed in this paper. This strategy combines the advantages of the carrier phase shift (CPS) modulation strategy and carrier disposition (PD) modulation strategy. By reconstructing the triangular carriers in improved CPS modulation strategy, a new carriers arrangement still retaining the characteristics of carrier phase shift was obtained. Compared with PD modulation strategy, the proposed modulation strategy has the same output voltage harmonic characteristics. Therefore, under the novel power balance modulation strategy proposed in this paper, the output power of the cascaded cells can be self-balanced, and the harmonic characteristics of the inverter output line voltage can be improved effectively. Taken three-cell cascaded multilevel inverter as an example, the method of carriers reconstruction and the principle of proposed power balance modulation strategy were provided. The time required for power balance was also analyzed. Simulation and experimental results verified the validity of the proposed strategy. © 2018, Electrical Technology Press Co. Ltd. All right reserved.

ISSN No.:1000-6753

Translation or Not:no

Date of Publication:2018-06-25

Co-author:Xu, Yaming,Na, Xianlong,Sun, Jianbo

Correspondence Author:cz

Date of Publication:2018-06-25