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High efficiency grid-connected system using switched-capacitor converter and Lyapunov approach to control design for inverters.

机译：使用开关电容器转换器和Lyapunov方法的高效并网系统，用于逆变器的控制设计。

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摘要

This dissertation develops a high efficiency step-up DC-DC converter serial with a grid connected inverter using Lyapunov approach for optimization.;Part I presents a transfomerless switched capacitor buck boost converter that is based on a traditional buck boost topology. The proposed converter achieves high voltage gain and higher efficiency when compared to the conventional buck boost converter. The average model based on state-space description is analyzed. The simulation results are presented to confirm the capability of the converter to generate high-voltage ratios. The proposed converter is suitable for applications which require high step-up DC-DC converters such as DC micro-grids and solar electrical energy.;Part II presents a Lyapunov approach to control design for grid connected inverters. The control objective is to track a reference current which is proportional to the fundamental harmonic of the grid voltage. By using the internal model principle, the grid voltage and the reference current are described as the outputs of an autonomous linear oscillatory system. The state of this oscillatory system contains all the information for the harmonics of the grid voltage and is estimated via an observer with zero estimation error at steady state. A state space description for the whole system is obtained by combining the state of the inverter circuit and that of the oscillatory system for the grid voltage. Based on the state space description, a Lyapunov approach is developed to design a state-feedback controller for tracking a reference current with minimal tracking error. The design problem is cast into an optimization problem, which can be effectively solved with linear matrix inequality (LMI) toolbox in Matlab. The Lyapunov approach ensures internal stability and makes efficient use of the structural information, such as the total harmonic distortion (THD) of the grid voltage, and the magnitude/phase of the reference current. The effectiveness of the Lyapunov approach is validated via SimPower simulation. A real circuit is built using microcontroller ezDSP28335, the output current obtained is in phase with the grid voltage and has small THD, as we expected.;Part III presents the combination of the two above systems, DC-DC converter and DC-AC inverter to make a completed system. The models are validated via SimPower simulation. The simulations are conducted to verify the response of the whole system under the conditions of input changes, different types of loads connected to the output, and the circuit's protection problem.
机译：本文利用Lyapunov方法开发了一种高效的升压DC-DC转换器，该转换器与并网逆变器串联，用于优化。第一部分提出了一种基于传统降压-升压拓扑结构的无变压器无开关电容器降压-升压转换器。与传统的降压/升压转换器相比，该转换器具有较高的电压增益和更高的效率。分析了基于状态空间描述的平均模型。给出的仿真结果证实了转换器产生高压比的能力。提出的转换器适用于需要高升压DC-DC转换器的应用，例如DC微电网和太阳能。第二部分介绍了Lyapunov方法来控制并网逆变器的设计。控制目标是跟踪与电网电压的基波谐波成比例的参考电流。通过使用内部模型原理，将电网电压和参考电流描述为自主线性振荡系统的输出。该振荡系统的状态包含有关电网电压谐波的所有信息，并通过观察者在稳定状态下估计误差为零。通过结合逆变器电路的状态和电网电压的振荡系统的状态，可以获得整个系统的状态空间描述。基于状态空间描述，开发了一种Lyapunov方法来设计一种状态反馈控制器，以最小的跟踪误差跟踪参考电流。设计问题被转化为优化问题，可以通过Matlab中的线性矩阵不等式（LMI）工具箱有效地解决。 Lyapunov方法可确保内部稳定性并有效利用结构信息，例如电网电压的总谐波失真（THD）和参考电流的幅值/相位。通过SimPower仿真验证了Lyapunov方法的有效性。正如我们预期的那样，使用微控制器ezDSP28335构建了一个实际电路，所获得的输出电流与电网电压同相，并且具有较小的THD。第三部分介绍了上述两个系统的组合，即DC-DC转换器和DC-AC逆变器做一个完整的系统。这些模型通过SimPower仿真进行了验证。进行仿真是为了验证在输入变化，连接到输出的不同类型的负载以及电路的保护问题下，整个系统的响应。

著录项

  • 作者

    Tran, Vu.;

  • 作者单位

    University of Massachusetts Lowell.;

  • 授予单位 University of Massachusetts Lowell.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 126 p.
  • 总页数 126
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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