三电平BOOST PFC分岔行为的研究

发布时间：2018-05-27 16:40

本文选题：三电平Boost + PFC　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：电力电子器件的使用给电网带来严重的谐波污染，对电网上其他设备的正常工作产生影响。现有开关电源等设备采用功率因数校正技术对其进行抑制，但是功率因数校正器在实际应用中存在不规则非线性行为，严重影响着系统的性能。因此，深入分析功率因数校正器中的非线性行为，对于优化电路参数，提高系统动态性能具有重要意义。本文在总结各种电力变换器建模方法和非线性行为辨识方法，并分析各自优缺点的基础上，针对三电平Boost PFC研究了平均电流控制和单周期控制两种不同控制方法下电路中存在的分岔行为。首先，分析了平均电流控制的三电平Boost PFC的工作原理，建立了三电平Boost PFC频闪映射模型，通过电路仿真分析了电路参数变化对快尺度分岔行为的影响，结果表明，，在输入电压范围较小时，电路容易发生间歇性的分岔行为。依据输入输出功率守恒原则，建立了三电平Boost PFC电路简化模型，运用Floquet理论分析了不同电路参数下系统的慢尺度分岔临界点，仿真结果与理论分析结果一致。然后，针对单周期控制三电平Boost PFC，在分析其工作原理的基础上，根据功率平衡原则建立了电路平均模型，通过谐波平衡法得到周期近似解，然后应用Floquet乘子法分析了主要电路参数对系统慢尺度分岔的影响。仿真结果与理论分析结果基本吻合，验证了电路简化模型和理论分析的正确性。最后，在理论分析与仿真验证的基础上，基于平均电流控制芯片UC3854设计了三电平Boost PFC系统，通过实验进一步验证了理论分析的正确性。针对三电平Boost PFC中存在的分岔行为的深入研究，对于电路设计具有指导意义，同时为非线性行为控制奠定了基础。
[Abstract]:The use of power electronic devices brings serious harmonic pollution to the power grid, which has an impact on the normal operation of other equipment on the power grid. Power factor correction (PFC) technology is used to suppress the switching power supply and other devices, but the nonlinear behavior of PFC in practical application seriously affects the performance of the system. Therefore, it is very important to analyze the nonlinear behavior of the power factor corrector for optimizing circuit parameters and improving the dynamic performance of the system. In this paper, the modeling methods and nonlinear behavior identification methods of power converters are summarized, and their advantages and disadvantages are analyzed. The bifurcation behavior of three-level Boost PFC is studied under two different control methods: average current control and single-period control. Firstly, the principle of three-level Boost PFC controlled by average current is analyzed, and the stroboscopic mapping model of three-level Boost PFC is established. The influence of circuit parameters on fast scale bifurcation behavior is analyzed by circuit simulation. When the input voltage range is small, the circuit is prone to intermittent bifurcation behavior. According to the principle of conserving input and output power, a simplified three-level Boost PFC circuit model is established. The critical point of slow scale bifurcation of the system under different circuit parameters is analyzed by using Floquet theory. The simulation results are consistent with the theoretical analysis results. Then, according to the principle of power balance, the circuit average model is established for single-period control three-level Boost, and the periodic approximate solution is obtained by harmonic balance method. Then the influence of main circuit parameters on the slow scale bifurcation of the system is analyzed by using the Floquet multiplier method. The simulation results are in good agreement with the theoretical analysis results, which verify the correctness of the simplified circuit model and the theoretical analysis. Finally, on the basis of theoretical analysis and simulation verification, a three-level Boost PFC system based on average current control chip (UC3854) is designed, and the correctness of the theoretical analysis is further verified by experiments. The research on the bifurcation behavior in three-level Boost PFC is of guiding significance to the circuit design and laying a foundation for nonlinear behavior control.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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