级联H桥整流及其直流侧电容电压平衡控制的研究
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摘要
本文以大功率无工频变压器级联式多电平变换器的级联整流级为研究对象,对单相、相整流级的建模与控制进行了深入的讨论。针对整流级各级联H桥直流侧电容电压的平衡问题进行了详细的分析,研究了单相两H桥级联的调制方法,提出了一种基于二维调制的新型调制策略,较好的解决整流级各级联H桥的均压问题。同时实现了运行在单位功率因数下的整流级系统,各级联H桥负载不平衡程度的最大化。采用本文所提出的调制策略,对单相多H桥级联扩展,以及三相多H桥级联扩展的方法进行了研究,较完整的实现了级联整流级的控制。研制出了一台小功率的整流级试验平台,仿真和试验结果有力的证明了本文研究成果的止确性。
This paper takes the cascaded H-Bridges rectifier (CHBR) stage of cascaded multi-level converter without line-frequency transformer as research subject. The control methods and mathematical models of its single-phase and three-phase system are thorough discussed. The problem of DC-link capacitor voltage balance is analysised. The modulation strategies of single-phase CHBR stage with two cells are researched in depth. A novel modulation stragtegy are proposed for balancing DC-link capacitor voltage perfectly based on two-dimensional modulation. A special operation point in the stable operating area of CHBR stage is proposed for extending unbalanced loads range and increasing voltage balance speed when the system works in the unity power factor. A novel extension method is proposed for cascading any number of H-Bridges for a single-phase system using proposed modulation strategy. The extension method of three-phase system is discussed, and a zero-sequence voltage is injected to the three-phase system for the clustered balancing control. A small power experiment platform is developed, and experiment results verify these theories proposed by this paper.
This paper takes the cascaded H-Bridges rectifier (CHBR) stage of cascaded multi-level converter without line-frequency transformer as research subject. The control methods and mathematical models of its single-phase and three-phase system are thorough discussed. The problem of DC-link capacitor voltage balance is analysised. The modulation strategies of single-phase CHBR stage with two cells are researched in depth. A novel modulation stragtegy are proposed for balancing DC-link capacitor voltage perfectly based on two-dimensional modulation. A special operation point in the stable operating area of CHBR stage is proposed for extending unbalanced loads range and increasing voltage balance speed when the system works in the unity power factor. A novel extension method is proposed for cascading any number of H-Bridges for a single-phase system using proposed modulation strategy. The extension method of three-phase system is discussed, and a zero-sequence voltage is injected to the three-phase system for the clustered balancing control. A small power experiment platform is developed, and experiment results verify these theories proposed by this paper.
引文
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