5レベルインバータの直流リンク入力電圧のバランス化のためのダブルマッピング方式による空間ベクトル変調法

抄録

A multi-level inverter has potential advantages in high blocking voltages and reduced harmonics. However, it has a technically challenging subject that the DC input voltages must be balanced. This paper proposes and investigates a new double-mapping-based space-vector modulation (SVM) method to solve the subject without any additional circuit. The proposed method consists of two steps. One is the SV map data generation for the five-level NPC inverter based on a general principle to utilize redundant SVs. The other is the optimal selection of the SV pattern which balances the the DC input voltages based on the double-mapping-based SVM method which has two different kind of control schemes for low and high modulation indexes. The proposed method is investigated and validated through simulated results by a digital control system.