基于空间电压矢量的有源中点箝位型五电平逆变器母线中点电压平衡问题的研究

发布时间：2018-10-26 19:56

【摘要】：有源中点箝位型五电平(active neutral-point-clamped five-level,ANPC-5L)变换器与三电平相比,具有输出电压等级较高、输出功率更大、电流谐波含量较低等特点,在高压大功率领域具有较高的研究价值。以ANPC-5L变换器作为研究对象,采用空间电压矢量脉宽调制控制算法,通过分析ANPC-5L变换器的单相拓扑结构及其工作原理,针对不同开关状态下的ANPC-5L变换器的母线中点电压的波动模型进行研究分析,得出了平衡母线中点电压偏差的公式及ANPC-5L变换器中点电位的平衡域曲线。以此为基础,提出一种有效平衡中点电压的控制方法,通过选择参考电压矢量所在三角形的开关序列及同时控制复用矢量的作用时间之比,实现了悬浮电容电压与中点电压的解耦和平衡控制,最后通过实验进一步验证了控制算法的正确性和有效性。
[Abstract]:The active neutral point clamped five-level (active neutral-point-clamped five-level,ANPC-5L) converter has higher output voltage, larger output power and lower current harmonic content than three-level converter. It has high research value in the field of high voltage and high power. Taking ANPC-5L converter as research object and adopting space voltage vector pulse width modulation control algorithm, the single-phase topology of ANPC-5L converter and its working principle are analyzed. The fluctuation model of midpoint voltage of ANPC-5L converter in different switching states is studied and analyzed. The formula of midpoint voltage deviation of balanced bus and the equilibrium curve of mid-point potential of ANPC-5L converter are obtained. On this basis, an effective control method for balancing the midpoint voltage is proposed. By selecting the switching sequence of the triangle in which the reference voltage vector is located and simultaneously controlling the ratio of the action time of the multiplexing vector, Decoupling and balancing control of levitation capacitor voltage and midpoint voltage are realized. Finally, the correctness and effectiveness of the control algorithm are further verified by experiments.
【作者单位】：中国矿业大学信息与电气工程学院;
【分类号】：TM464;TM645.11

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