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Non linear analysis and control of DC-DC power converters feeding downstream power converters.

机译：向下游功率转换器供电的DC-DC功率转换器的非线性分析和控制。

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摘要

The main contribution of this thesis is to analyze, and also to propose design criteria for, linear and nonlinear controllers applied to DC-DC converters feeding downstream power converters. This topology is the basic configuration for power electronics based distributed power systems (DPS). DPS share a common characteristic, which is the connection in cascade of power converters. In this architecture, a primary power converter regulates the voltage of a common DC distribution bus where power converters acting as load are connected. Load power converters can be motor drivers or DC-DC converters that perform, in stages, the final voltage regulation required by the final loads. Due to the voltage regulation loop included in the load converters, these units present a behavior similar to a constant power load (CPL) at input terminals. Its dynamic behavior is equivalent to a dynamic negative resistance, destabilizing the DC bus and consequently the system.; This work develops a systematic non-linear analysis of power converters operating in cascade based on the phase-plane and geometric considerations of the vector field defined by the differential equation modeling the system. A large-signal averaged model of the converter is considered to include in the controller design not only the behavior around the operation point but also the behavior of the converter operating in different modes and in saturation. The topology of the vector field for different power converters and simple controllers is first analyzed considering an ideal CPL to model the load presented to the primary converter by the downstream converters. DC-DC power converters loaded by ideal CPL present a unique phase portrait with several equilibrium points defining only local convergence of the operation point of the system. For simple cases, the region of attraction can be analyzed using the phase-plane, where the boundary of that basin is mainly defined by the stable manifold of the unstable equilibrium points. This preliminary study allows extending the analysis to more realistic cases, which are DC-DC power converters including over-current protections and load models that consider the start-up behavior of downstream converters. The additional non-linearities included in the model set new equilibrium points and redefine the region of convergence of the operation point. For low order systems, the phase plane analysis gives a simple tool to analyze the interaction between the primary source and load converters and design the primary controller and its protections. Based on general properties of the model, the analysis can be extended to higher order systems that include both dynamics in the controller and more complex converters. Similar conclusions can be extrapolated about the basin of attraction of the operation point for those systems.
机译：本文的主要贡献是分析并提出了线性和非线性控制器的设计准则，该控制器适用于向下游功率转换器供电的DC-DC转换器。此拓扑是基于电力电子设备的分布式电源系统（DPS）的基本配置。 DPS具有一个共同的特征，即级联功率转换器。在这种架构中，主功率转换器调节公共直流配电总线的电压，在该总线上连接了充当负载的功率转换器。负载功率转换器可以是分阶段执行最终负载所需的最终电压调节的电动机驱动器或DC-DC转换器。由于负载转换器中包含稳压电路，因此这些单元的行为类似于输入端子上的恒定功率负载（CPL）。它的动态行为等效于动态负电阻，从而使DC总线以及整个系统不稳定。这项工作基于系统的微分方程定义的矢量场的相平面和几何考虑，对级联运行的功率转换器进行了系统的非线性分析。转换器的大信号平均模型被认为不仅包括工作点周围的行为，而且还包括以不同模式和饱和状态工作的转换器的行为。首先考虑理想CPL来分析不同功率转换器和简单控制器的矢量场的拓扑，以模拟下游转换器提供给主转换器的负载。由理想CPL加载的DC-DC电源转换器呈现出具有几个平衡点的唯一相位肖像，这些平衡点仅定义了系统工作点的局部收敛。对于简单的情况，可以使用相平面来分析吸引区域，该盆地的边界主要由不稳定平衡点的稳定流形来定义。这项初步研究可以将分析扩展到更实际的情况，包括直流-直流电源转换器，其中包括考虑下游转换器的启动行为的过电流保护和负载模型。模型中包含的其他非线性设置了新的平衡点，并重新定义了操作点的收敛区域。对于低阶系统，相平面分析提供了一个简单的工具来分析主电源和负载转换器之间的相互作用，并设计主控制器及其保护。根据模型的一般属性，可以将分析扩展到更高阶的系统，包括控制器中的动力学特性和更复杂的转换器。关于这些系统的工作点吸引盆地可以得出类似的结论。

著录项

  • 作者

    Rivetta, Claudio H.;

  • 作者单位

    Illinois Institute of Technology.;

  • 授予单位 Illinois Institute of Technology.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 202 p.
  • 总页数 202
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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