基于传统和二阶滑模理论的功率变换器控制设计

发布时间：2018-01-16 14:43

本文关键词：基于传统和二阶滑模理论的功率变换器控制设计　出处：《江苏大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着社会的发展,电子设备的种类日趋多样化,对电源的要求也日益提高。开关电源因具有效率高、能耗低、性能稳定等优点,得到了广泛的应用。实现功率变换是开关电源的基础。通过设计高效的控制方法,可以提高功率变换器的性能指标。鉴于传统线性PID控制器在大扰动工况条件下的功率变换器中未能获得令人满意的控制效果。为了得到更好的控制效果,很多学者致力于研究新的控制方法。本文利用滑模控制理论,先后设计了两种非线性控制方法,并给出了理论可行性分析和上述控制方法的具体实现步骤,本文主要工作如下:(1)对功率变换器的研究方法和滑模控制理论及其在功率变换器上应用的研究现状进行了阐述,并明确本论文研究的主要研究内容。(2)完成了功率变换器建模和软硬件平台设计。首先以Buck变换器为例,分析工作原理,并考虑系统扰动因素,建立实际数学模型。然后设计Buck变换器的底层硬件电路板模块,再将所设计的实际电路通过数据采集卡与LabVIEW软件连接,通过LabVIEW编写算法程序,实现闭环控制平台的搭建。以PID控制算法为例,验证了软硬件实验平台的可行性。(3)设计了基于一阶滑模与扰动观测的Buck变换器复合控制方法。首先,引入扰动观测技术观测电压偏差变化率中的扰动,设计包含补偿量的滑模面,然后采用趋近律法对控制器进行设计。考虑到一阶滑模的抖振问题,采用准滑动模态方法改进控制器,接着再次引入扰动观测技术来补偿系统中的集总扰动,并通过仿真和实验验证该控制方法的有效性。(4)设计了基于二阶滑模的Buck变换器控制方法。首先利用二阶滑模控制技术,设计非连续的二阶滑模控制器,然后将实际控制器取为非连续控制器的积分,从而避免了控制器的抖振。理论上通过Lyapunov稳定性定理证明所提方法的有限时间稳定性。最后通过仿真和实验验证了该控制方法在保证鲁棒性的同时也避免了滑模的抖振问题。(5)对本文的研究内容进行了总结,指出了本文存在的缺陷和有待进一步改善提高之处,并对未来的研究方向进行展望。
[Abstract]:With the development of society, the kinds of electronic equipment is becoming more diverse, the power requirements are increasing. The switching power supply has the advantages of high efficiency, low energy consumption, stable performance and other advantages, has been widely used. The power converter is based switching power supply. The design of efficient control method, can improve the performance of power converter in view of the traditional linear PID controller in power converter to large disturbance conditions to obtain satisfactory control effect. In order to get better control performance, many scholars dedicated to the study of new control method. By using the sliding mode control theory, has designed two kinds of nonlinear control methods, and gives concrete realization step theory feasibility analysis and the control method, the main work is as follows: (1) the power converter research method and sliding mode control theory in power Change the state of the study on application are discussed, the main research contents and clear in this paper. (2) completed the design of the power converter modeling software and hardware platform. Based on the Buck converter as an example, analysis of the working principle, and considering the system disturbance factors, establish the model of the actual number of hardware circuit board bottom. Then the module design of Buck converter, and then the actual circuit design through the data acquisition card is connected with the LabVIEW software, the program is compiled by LabVIEW, to build a platform to achieve closed-loop control. The PID control algorithm as an example, to verify the feasibility of hardware and software experimental platform. (3) the design of the Buck converter control method observation and order based on sliding mode disturbance. Firstly, introducing disturbance observation technology observation voltage deviation change rate of the sliding surface design includes the compensation amount, and then the approach to controller design law. Taking into account the chattering problem of first-order sliding mode, quasi sliding mode method is used to improve the controller, and then re introduced the disturbance observation technology to compensate system lumped disturbance, and the validity of the control method is verified by simulation and experiment. (4) the design of the Buck converter two order sliding mode control method based on the first use. Two order sliding mode control technique, the design of two order sliding mode controller is continuous, then the actual controller for the non continuous integral controller, thereby avoiding the chattering of the controller. The theory of finite time stability proved by Lyapunov stability theorem of the proposed method. The simulation and experimental results verify the control method to ensure the robustness at the same time to avoid the chattering of the sliding mode. (5) the contents of this study are summarized, pointing out the shortcomings of this paper are to be further improved and improved, and the The research direction is prospected.

【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273;TM46

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