数字电流模控制的DC-DC开关变换器的离散z域建模及稳定性分析
发布时间：2019-05-28 14:47
【摘要】：数字控制不仅具有高灵活性、可编程性等特点，而且可以采用更先进的控制算法来提高功率开关变换器的综合性能。因此，功率开关变换器由模拟控制转向数字控制成为电力电子功率变换器的一种发展趋势。由于数字控制DC-DC开关变换器会受到时间延迟、采样和量化误差等因素的影响，，其切换非线性特性的分析过程更复杂。因此，建立数字控制DC-DC开关变换器的模型至关重要。 本论文工作属于导师主持的国家自然基金项目(编号：51077057)——“数字控制的开关功率变换器的建模、稳定性分析及其应用的研究”的部分内容。论文对数字电流模控制的DC-DC变换器的建模及稳定性进行了深入研究，主要研究内容为： (1)建立了数字控制DC-DC开关变换器的采样量化模型，分析了其量化效应。并基于此模型进行了实例仿真分析，仿真结果表明：DPWM模块的分辨率决定数字控制系统的最高性能。 (2)建立了数字电流模控制DC-DC开关变换器的更加完整的离散z域模型。本文首先对比分析了数字峰值电流模控制算法的性能；然后基于状态空间平均法及交流小信号模型，求解出了其主功率级电路模型、峰值电流控制器及控制方式算法模型；最后考虑了环路中的时间延迟、采样量化等因素，对系统进行离散化处理，推导出了系统离散z域模型。 (3)理论分析了采样保持环节和延迟环节对数字电流模控制DC-DC变换器的稳定性的影响。理论分析表明：数字电流模控制DC-DC变换器的稳定性不仅与电路参数有关，还受限于采样周期T；延迟环节使系统相位产生滞后，进而影响系统的稳定性。 (4)设计出了数字化PI控制器，搭建了系统matlab/Simulink仿真模型，并对其进行了稳态、负载扰动等仿真分析，仿真结果表明了数字电流模控制的DC-DC变换器具有良好的稳态、抗负载扰动性能，并检验了系统模型的有效性和准确性，验证了系统稳定性的理论分析的正确性。 (5)仿真发现了数字电流模控制Boost变换器潜在的低频振荡现象，提出了利用闭环系统的特征根的方法更清晰、直观地来揭示该现象产生的机理，并进行了实例分析。
[Abstract]:The digital control not only has the characteristics of high flexibility, programmability and the like, but also can adopt more advanced control algorithm to improve the comprehensive performance of the power switch converter. Therefore, the power switch converter is a developing trend of the power electronic power converter by the analog control and steering digital control. Because the digital control DC-DC switching converter can be influenced by time delay, sampling and quantization error, the analysis process of switching nonlinear characteristics is more complex. Therefore, a model for establishing a digital control DC-DC switching converter is critical. The work of this paper is part of the national natural fund project (No.:51077057) _ "Modeling, stability analysis and application of digital-controlled switched-power converter" hosted by the tutor In this paper, the modeling and stability of the DC-DC converter controlled by digital current mode are studied in detail. In order to: (1) establish the sampling and quantization model of the digital control DC-DC switch converter, and analyze the quantity The simulation results show that the resolution of the DPWM module determines the most important of the digital control system. High performance. (2) The digital current mode is established to control the more complete separation of the DC-DC switch converter. This paper first compares the performance of the digital peak current mode control algorithm, and then, based on the state space average method and the AC small signal model, the main power level circuit model, the peak current controller and the control mode algorithm model are solved. Finally, the loop is considered The system is discretized and the system is deduced from the factors such as time delay, sampling and quantization. (3) The digital current mode control DC-DC converter is analyzed by the theory of the sample-hold and the delay. The theoretical analysis shows that the stability of the DC-DC converter is not only related to the circuit parameters but also the sampling period T. The delay link delays the phase of the system. In this paper, the digital PI controller is designed, the system matlab/ Simulink simulation model is set up, and the simulation and analysis of the steady state and the load disturbance are carried out. The simulation results show that the DC-DC converter with digital current mode control has good stability. State, anti-load disturbance performance, and verify the effectiveness and accuracy of the system model, and verify the stability of the system The correctness of the theory analysis is the correctness of the theoretical analysis. (5) The simulation shows that the potential low-frequency oscillation of the Boost converter is controlled by the digital current mode, and the method of using the characteristic root of the closed-loop system is more clear and intuitive to reveal the phenomenon.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46
本文编号：2487144
[Abstract]:The digital control not only has the characteristics of high flexibility, programmability and the like, but also can adopt more advanced control algorithm to improve the comprehensive performance of the power switch converter. Therefore, the power switch converter is a developing trend of the power electronic power converter by the analog control and steering digital control. Because the digital control DC-DC switching converter can be influenced by time delay, sampling and quantization error, the analysis process of switching nonlinear characteristics is more complex. Therefore, a model for establishing a digital control DC-DC switching converter is critical. The work of this paper is part of the national natural fund project (No.:51077057) _ "Modeling, stability analysis and application of digital-controlled switched-power converter" hosted by the tutor In this paper, the modeling and stability of the DC-DC converter controlled by digital current mode are studied in detail. In order to: (1) establish the sampling and quantization model of the digital control DC-DC switch converter, and analyze the quantity The simulation results show that the resolution of the DPWM module determines the most important of the digital control system. High performance. (2) The digital current mode is established to control the more complete separation of the DC-DC switch converter. This paper first compares the performance of the digital peak current mode control algorithm, and then, based on the state space average method and the AC small signal model, the main power level circuit model, the peak current controller and the control mode algorithm model are solved. Finally, the loop is considered The system is discretized and the system is deduced from the factors such as time delay, sampling and quantization. (3) The digital current mode control DC-DC converter is analyzed by the theory of the sample-hold and the delay. The theoretical analysis shows that the stability of the DC-DC converter is not only related to the circuit parameters but also the sampling period T. The delay link delays the phase of the system. In this paper, the digital PI controller is designed, the system matlab/ Simulink simulation model is set up, and the simulation and analysis of the steady state and the load disturbance are carried out. The simulation results show that the DC-DC converter with digital current mode control has good stability. State, anti-load disturbance performance, and verify the effectiveness and accuracy of the system model, and verify the stability of the system The correctness of the theory analysis is the correctness of the theoretical analysis. (5) The simulation shows that the potential low-frequency oscillation of the Boost converter is controlled by the digital current mode, and the method of using the characteristic root of the closed-loop system is more clear and intuitive to reveal the phenomenon.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46
【参考文献】
相关期刊论文 前10条
1 王凤岩;任黎立;许建平;;基于F2812的逆变器数字控制器的建模与设计[J];电工技术学报;2009年02期
2 周雒维;孙鹏菊;杜雄;;数字控制DC-DC变换器的延时离散模型及影响分析[J];电机与控制学报;2010年05期
3 成燕;孙勇军;;电力电子变换器建模综述[J];电气传动自动化;2008年06期
4 朱峰;唐正明;;传输线分布参数模型与物理模型[J];电气电子教学学报;2010年06期
5 陈素芬;张波;;DC-DC变换器中非线性现象研究的发展综述[J];电源世界;2007年06期
6 季少卫,翁继周;电流型PWM控制器在电源中的应用[J];电子工程师;2004年11期
7 余明杨;蒋新华;曹建平;;开关元件的改进传输线模型研究[J];机电工程;2007年08期
8 华伟;通信开关电源的五种PWM反馈控制模式研究[J];通信电源技术;2001年02期
9 戴栋,马西奎,李小峰;一类具有两个边界的分段光滑系统中边界碰撞分岔现象及混沌[J];物理学报;2003年11期
10 张笑天;马西奎;张浩;;数字控制DC-DC Buck变换器中低频振荡现象分析[J];物理学报;2008年10期
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