Nine-switch converter has promising application prospects in fields where cost, volume and power density are required. The performance of the converter depends to a large extent on the modulation strategy. The existing SVPWM strategy for nine-switch converter requires a lengthy zero-vectors table to make over-modulation judgment, which increased the complexity of the algorithm and the runtime of the program. To improve performance, a novel simplified SVPWM strategy for nine-switch converter is proposed in this paper. The zero-vectors table is replaced by a set of simple formulas for over-modulation judgment and processing. This simplification is based on derivation of the implied reference signals of the SVPWM strategy. The correctness of the proposed algorithm is verified through simulation and experimental results. It is also demonstrated that the proposed simplified algorithm can achieve the same output results as the traditional method with less code length and runtime.

中文翻译：

---

九开关变换器的简化SVPWM策略研究

九开关变换器在对成本、体积和功率密度有要求的领域具有广阔的应用前景。转换器的性能在很大程度上取决于调制策略。现有的九开关变换器SVPWM策略需要一个冗长的零向量表来进行过调制判断，增加了算法的复杂度和程序的运行时间。为了提高性能，本文提出了一种用于九开关转换器的新型简化 SVPWM 策略。零向量表由一组简单的公式代替，用于过调制判断和处理。这种简化基于 SVPWM 策略隐含参考信号的推导。通过仿真和实验结果验证了所提算法的正确性。