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首页> 外文OA文献 >Power factor correction topologies and small-signal modeling. I: Single-phase and three-phase power factor correction. II: Small-signal analysis of converters in discontinuous conduction mode
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Power factor correction topologies and small-signal modeling. I: Single-phase and three-phase power factor correction. II: Small-signal analysis of converters in discontinuous conduction mode

机译：功率因数校正拓扑和小信号建模。 I：单相和三相功率因数校正。 II：非连续导通模式下转换器的小信号分析

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Part I: This thesis is motivated by the increasing demand for power quality improvement. Power factor correction topologies for both single- and the three-phase utility lines areudinvestigated and new modes of operation are introduced. The discussed topologies are so-called automatic power factor correctors. The current shaping function is a naturaludproperty of these circuits, and no extra current control loop is necessary.udududIn both the single- and three-phase cases, a control method is introduced which provides full output regulation and simultaneously reduces the distortion of the inputudcurrent at no extra cost.ududWhereas in the single-phase topology, galvanic isolation is easily obtained, in the three-phase topology, some obstacles have to be overcome. The isolated three-phaseudconverter has an inherent output voltage ripple. This problem is analyzed and a solution is presented.udududResults obtained on experimental circuits agree well with the prediction and therefore confirm the validity of the analysis.ududPart II:ududThe small-signal behavior of converters in discontinuous conduction mode (DCM) is investigated using an alternative approach. Transfer functions obtained by state-spaceudaveraging in DCM do not provide accurate results at higher frequencies. A correction term is introduced that can be added to the transfer function. This greatly enhances theudaccuracy.ududFor converters operating in DCM, the state-space averaging method as originally introduced is relatively complicated if more than one element operates in discontinuousudconduction mode. In this thesis, a standardized procedure is introduced to perform state-space averaging. Also, the complexity of this procedure does not increase as theudnumber of discontinuous states increases.ud
机译：第一部分：本论文的动机是对电能质量改善的需求不断增长。对单相和三相公用事业线路的功率因数校正拓扑进行了研究，并引入了新的工作模式。所讨论的拓扑是所谓的自动功率因数校正器。电流整形功能是这些电路的自然属性，不需要额外的电流控制环路。 ud ud ud在单相和三相情况下，都引入了一种控制方法，该方法可提供完整的输出调节并同时无需额外成本即可降低输入 udcurrent的失真。 ud ud在单相拓扑中，很容易实现电流隔离，而在三相拓扑中，必须克服一些障碍。隔离的三相 udcon转换器具有固有的输出电压纹波。 ud ud ud在实验电路上获得的结果与预测结果吻合良好，因此确认了分析的有效性。 ud ud第二部分： ud ud转换器的小信号行为使用替代方法研究了不连续传导模式（DCM）中的电流。在DCM中，通过状态空间求平均获得的传递函数无法在较高频率下提供准确的结果。引入了可以添加到传递函数的校正项。对于DCM中运行的转换器，如果有多个元素以不连续 udconduct模式运行，则最初引入的状态空间平均方法相对复杂。本文提出了一种标准化的程序来进行状态空间平均。同样，此过程的复杂性不会随着不连续状态的数量增加而增加。

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    Schenk Kurt;

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  • 年度 1999
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