Three-phase inverters are usually required to output reactive power in electric machine drives, renewable energy generation, static var generators and other power electronic systems. Therefore the inverter may operate within wide power factor angle range. However, traditional Zero-Voltage-Switching Space Vector Modulation (ZVS-SVM) method for three-phase ZVS inverter is only applicable when power factor angle is between -π/6 and +π/6. In this paper, a general ZVS-SVM method for three-phase inverter with arbitrary output is proposed. The principles for vector selection and vector sequence arrangement are discussed in detail. With only one switching operation of the auxiliary switch in each switching cycle, ZVS of all switches can be achieved. Operation stage analyses and ZVS condition of the inverter with the proposed method are introduced. In addition, the resonant parameters design considerations and loss analyses are investigated. Finally the proposed ZVS-SVM method is verified by experiments.

中文翻译：

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软开关三相逆变器的广义空间矢量调制方法

在电机驱动、可再生能源发电、静态无功发电机和其他电力电子系统中，通常需要三相逆变器来输出无功功率。因此逆变器可以在较宽的功率因数角范围内运行。然而，传统的用于三相 ZVS 逆变器的零电压开关空间矢量调制 (ZVS-SVM) 方法仅适用于功率因数角在 -π/6 和 +π/6 之间的情况。本文提出了一种适用于任意输出三相逆变器的通用ZVS-SVM方法。详细讨论了向量选择和向量序列排列的原则。每个开关周期只需辅助开关一次开关操作，即可实现所有开关的ZVS。介绍了采用该方法的逆变器的运行阶段分析和ZVS条件。此外，还研究了谐振参数设计注意事项和损耗分析。最后通过实验验证了所提出的 ZVS-SVM 方法。