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首页> 外文学位 >Digital control of DC/DC converters driving constant power loads in vehicular systems.
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Digital control of DC/DC converters driving constant power loads in vehicular systems.

机译：驱动车辆系统中恒定功率负载的DC / DC转换器的数字控制。

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摘要

Multi-converter power electronics based power systems are being increasingly used in many applications such as telecommunication systems, sea and undersea vehicles, international space station, aircraft, electric vehicles, hybrid electric vehicles, and fuel cell vehicles, where reliability is of prime concern. The number of power electronic converters in these multi-converter electrical power systems varies from a few converters in a conventional land vehicle to tens of converters in advanced aircraft, to hundreds of converters in the international space station.; In many advanced applications, power electronic converters need to be tightly regulated. From the output perspective, this property is highly desirable. However, since power electronic converters are efficient, tight regulation of the output makes the converter appear as a constant power load (CPL) at its input side. Dynamic behavior of constant power loads is equivalent to negative impedance and, therefore, can result in instability of the interconnected power system. Hence, stability of the power electronics intensive systems is a significant design challenge because of the potential for negative impedance instability.; In order to mitigate the problem of negative impedance instability, Pulse Adjustment, a novel fixed frequency digital control technique, for converters operating with constant power loads is presented in this dissertation. This novel digital control approach treats the converter as a digital system and achieves output voltage regulation by choosing high and low power pulses instead of using conventional pulse width modulation (PWM) scheme. A comparator compares actual output voltage with the reference voltage and then switches between the appropriate states. Therefore, the digital control task is to deliver right amount of energy to the converter by right numbers of state operations so that the average power delivery matches the required power.; It needs few logic gates and comparators to implement this digital control, thus, making it extremely simple and easy to develop using low-cost application specific integrated circuits. It is simple, cost effective, and dynamically fast. The proposed technique is applicable to all types of converters in all modes of operation. In addition to this theory and its analytical explanation, mathematical models as well as, simulation and experimental results of the proposed control technique, being applied to DC/DC converters, are presented in this dissertation.
机译：基于多转换器功率电子学的电源系统正越来越多地用于可靠性非常重要的应用中，例如电信系统，海上和海底车辆，国际空间站，飞机，电动车，混合电动车和燃料电池车。这些多转换器电力系统中的功率电子转换器的数量从常规陆地车辆中的几个转换器到先进飞机中的数十个转换器，再到国际空间站中的数百个转换器，不等。在许多高级应用中，需要严格调节功率电子转换器。从输出的角度来看，此属性是非常理想的。但是，由于功率电子转换器是高效的，输出的严格调节使转换器在其输入侧表现为恒定的功率负载（CPL）。恒定功率负载的动态行为等效于负阻抗，因此会导致互连的电源系统不稳定。因此，由于潜在的负阻抗不稳定性​​，电力电子密集型系统的稳定性是一项重大的设计挑战。为了减轻负阻抗不稳定性​​的问题，本文提出了一种新型的固定频率数字控制技术-脉冲调节器，用于恒定功率负载的变频器。这种新颖的数字控制方法将转换器视为数字系统，并通过选择高功率和低功率脉冲而不是使用传统的脉冲宽度调制（PWM）方案来实现输出电压调节。比较器将实际输出电压与参考电压进行比较，然后在适当的状态之间切换。因此，数字控制任务是通过正确数量的状态操作将正确量的能量传递给转换器，以使平均功率传递与所需功率相匹配。它只需很少的逻辑门和比较器即可实现此数字控制，因此，使用低成本专用集成电路进行开发非常简单容易。它简单，经济高效且动态快速。所提出的技术适用于所有操作模式下的所有类型的转换器。除了该理论及其分析解释外，本文还提出了所提出的控制技术应用于DC / DC变换器的数学模型以及仿真和实验结果。

著录项

  • 作者

    Khaligh, Alireza.;

  • 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 2006
  • 页码 224 p.
  • 总页数 224
  • 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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